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Caldwell, Nelson

Fellowship Advisor Smithsonian Astrophysical Observatory staff

M31; star clusters in galaxies; dwarf galaxies; star formation in galaxies.

Background And Education

Education And Training

Publications

Selected Publications

  • Article

    • Jones, Michael G., Sand, David J., Bellazzini, Michele, Spekkens, Kristine, Cannon, John M., Mutlu-Pakdil, Burçin, Karunakaran, Ananthan, Beccari, Giacomo, Magrini, Laura, Cresci, Giovanni, Inoue, John L., Fuson, Jackson, Adams, Elizabeth A. K., Battaglia, Giuseppina, Bennet, Paul, Crnojević, Denija, Caldwell, Nelson, Guhathakurta, Puragra, Haynes, Martha P., Muñoz, Ricardo R., Seth, Anil, Strader, Jay, Toloba, Elisa, and Zaritsky, Dennis. 2022. "AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo." The Astrophysical Journal, 926 L15. https://doi.org/10.3847/2041-8213/ac51dc. 2022
    • Jones, Michael G., Sand, David J., Bellazzini, Michele, Spekkens, Kristine, Cannon, John M., Mutlu-Pakdil, Burçin, Karunakaran, Ananthan, Beccari, Giacomo, Magrini, Laura, Cresci, Giovanni, Inoue, John L., Fuson, Jackson, Adams, Elizabeth A. K., Battaglia, Giuseppina, Bennet, Paul, Crnojević, Denija, Caldwell, Nelson, Guhathakurta, Puragra, Haynes, Martha P., Muñoz, Ricardo R., Seth, Anil, Strader, Jay, Toloba, Elisa, and Zaritsky, Dennis. 2022. "AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo." The Astrophysical Journal, 926 L15. https://doi.org/10.3847/2041-8213/ac51dc. 2022
    • Jones, Michael G., Sand, David J., Bellazzini, Michele, Spekkens, Kristine, Cannon, John M., Mutlu-Pakdil, Burçin, Karunakaran, Ananthan, Beccari, Giacomo, Magrini, Laura, Cresci, Giovanni, Inoue, John L., Fuson, Jackson, Adams, Elizabeth A. K., Battaglia, Giuseppina, Bennet, Paul, Crnojević, Denija, Caldwell, Nelson, Guhathakurta, Puragra, Haynes, Martha P., Muñoz, Ricardo R., Seth, Anil, Strader, Jay, Toloba, Elisa, and Zaritsky, Dennis. 2022. "AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo." The Astrophysical Journal, 926 L15. https://doi.org/10.3847/2041-8213/ac51dc. 2022
    • Pechetti, Renuka, Seth, Anil, Kamann, Sebastian, Caldwell, Nelson, Strader, Jay, den Brok, Mark, Luetzgendorf, Nora, Neumayer, Nadine, and Voggel, Karina. 2022. "Detection of a 100,000 M ⊙ black hole in M31's Most Massive Globular Cluster: A Tidally Stripped Nucleus." The Astrophysical Journal, 924 48. https://doi.org/10.3847/1538-4357/ac339f. 2022
    • Bennet, P., Sand, D. J., Crnojević, D., Weisz, D. R., Caldwell, Nelson, Guhathakurta, P., Hargis, J. R., Karunakaran, A., Mutlu-Pakdil, B., Olszewski, E., Salzer, J. J., Seth, A. C., Simon, J. D., Spekkens, K., Stark, D. P., Strader, J., Tollerud, E. J., Toloba, E., and Willman, B. 2022. "Hubble Space Telescope Imaging of Isolated Local Volume Dwarfs GALFA Dw3 and Dw4." The Astrophysical Journal, 924 98. https://doi.org/10.3847/1538-4357/ac356c. 2022
    • Carter, Courtney, Conroy, Charlie, Zaritsky, Dennis, Ting, Yuan-Sen, Bonaca, Ana, Naidu, Rohan P., Johnson, Benjamin D., Cargile, Phillip A., Caldwell, Nelson, Speagle, Joshua, and Han, Jiwon Jesse. 2021. "Ancient Very Metal-poor Stars Associated with the Galactic Disk in the H3 Survey." The Astrophysical Journal 908:208. https://doi.org/10.3847/1538-4357/abcda4 2021
    • Hughes, Allison K., Sand, David J., Seth, Anil, Strader, Jay, Voggel, Karina, Dumont, Antoine, Crnojević, Denija, Caldwell, Nelson, Forbes, Duncan A., Simon, Joshua D., Guhathakurta, Puragra, and Toloba, Elisa. 2021. "NGC 5128 Globular Cluster Candidates Out to 150 kpc: A Comprehensive Catalog from Gaia and Ground-based Data." The Astrophysical Journal 914:16. https://doi.org/10.3847/1538-4357/abf63c 2021
    • Bonaca, Ana, Naidu, Rohan P., Conroy, Charlie, Caldwell, Nelson, Cargile, Phillip A., Han, Jiwon Jesse, Johnson, Benjamin D., Kruijssen, J. M. Diederik, Myeong, G. C., Speagle, Joshua S., Ting, Yuan-Sen, and Zaritsky, Dennis. 2021. "Orbital Clustering Identifies the Origins of Galactic Stellar Streams." The Astrophysical Journal 909:L26. https://doi.org/10.3847/2041-8213/abeaa9 2021
    • Naidu, Rohan P., Conroy, Charlie, Bonaca, Ana, Zaritsky, Dennis, Weinberger, Rainer, Ting, Yuan-Sen, Caldwell, Nelson, Tacchella, Sandro, Han, Jiwon Jesse, Speagle, Joshua S., and Cargile, Phillip A. 2021. "Reconstructing the Last Major Merger of the Milky Way with the H3 Survey." The Astrophysical Journal, 92. 923, https://doi.org/10.3847/1538-4357/ac2d2d. 2021
    • Mutlu-Pakdil, Burçin, Sand, David J., Crnojević, Denija, Drlica-Wagner, Alex, Caldwell, Nelson, Guhathakurta, Puragra, Seth, Anil C., Simon, Joshua D., Strader, Jay, and Toloba, Elisa. 2021. "Resolved Dwarf Galaxy Searches within 5 Mpc with the Vera Rubin Observatory and Subaru Hyper Suprime-Cam." The Astrophysical Journal, 88. 918, https://doi.org/10.3847/1538-4357/ac0db8. 2021
    • Pace, Andrew B., Walker, Matthew G., Koposov, Sergey E., Caldwell, Nelson, Mateo, Mario, Olszewski, Edward W., Bailey, John I.,III, and Wang, Mei-Yu. 2021. "Spectroscopic Confirmation of the Sixth Globular Cluster in the Fornax Dwarf Spheroidal Galaxy." The Astrophysical Journal, 77. 923, https://doi.org/10.3847/1538-4357/ac2cd2. 2021
    • Bhattacharya, Souradeep, Arnaboldi, Magda, Gerhard, Ortwin, McConnachie, Alan, Caldwell, Nelson, Hartke, Johanna, and Freeman, Kenneth C. 2021. "The survey of planetary nebulae in Andromeda (M 31). III. Constraints from deep planetary nebula luminosity functions on the origin of the inner halo substructures in M 31." Astronomy and Astrophysics 647:A130. https://doi.org/10.1051/0004-6361/202038366 2021
    • Voggel, Karina T., Seth, Anil C., Sand, David J., Hughes, Allison, Strader, Jay, Crnojevic, Denija, and Caldwell, Nelson. 2020. "A Gaia-based Catalog of Candidate Stripped Nuclei and Luminous Globular Clusters in the Halo of Centaurus A." The Astrophysical Journal 899:140. https://doi.org/10.3847/1538-4357/ab6f69 2020
    • Caldwell, Nelson, Bonaca, Ana, Price-Whelan, Adrian M., Sesar, Branimir, and Walker, Matthew G. 2020. "A Larger Extent for the Ophiuchus Stream." The Astronomical Journal 159:287. https://doi.org/10.3847/1538-3881/ab8cbf 2020
    • Zaritsky, Dennis, Conroy, Charlie, Zhang, Huanian, Naidu, Rohan P., Bonaca, Ana, Caldwell, Nelson, Cargile, Phillip A., and Johnson, Benjamin D. 2020. "A Lower Limit on the Mass of Our Galaxy from the H3 Survey." The Astrophysical Journal 888:114. https://doi.org/10.3847/1538-4357/ab5b93 2020
    • Zaritsky, Dennis, Conroy, Charlie, Naidu, Rohan P., Cargile, Phillip A., Putman, Mary, Besla, Gurtina, Bonaca, Ana, Caldwell, Nelson, Han, Jiwon Jesse, Johnson, Benjamin D., Speagle, Joshua S., and Ting, Yuan-Sen. 2020. "Discovery of Magellanic Stellar Debris in the H3 Survey." The Astrophysical Journal 905:L3. https://doi.org/10.3847/2041-8213/abcb83 2020
    • Naidu, Rohan P., Conroy, Charlie, Bonaca, Ana, Johnson, Benjamin D., Ting, Yuan-Sen, Caldwell, Nelson, Zaritsky, Dennis, and Cargile, Phillip A. 2020. "Evidence from the H3 Survey That the Stellar Halo Is Entirely Comprised of Substructure." The Astrophysical Journal 901:48. https://doi.org/10.3847/1538-4357/abaef4 2020
    • Bonaca, Ana, Conroy, Charlie, Hogg, David W., Cargile, Phillip A., Caldwell, Nelson, Naidu, Rohan P., Price-Whelan, Adrian M., Speagle, Joshua S., and Johnson, Benjamin D. 2020. "High-resolution Spectroscopy of the GD-1 Stellar Stream Localizes the Perturber near the Orbital Plane of Sagittarius." The Astrophysical Journal 892:L37. https://doi.org/10.3847/2041-8213/ab800c 2020
    • Girardi, Léo, Boyer, Martha L., Johnson, L. Clifton, Dalcanton, Julianne J., Rosenfield, Philip, Seth, Anil C., Skillman, Evan D., Weisz, Daniel R., Williams, Benjamin F., Bhattacharya, Antara Raaghavi, Bressan, Alessandro, Caldwell, Nelson, Chen, Yang, Dolphin, Andrew E., Fouesneau, Morgan, Goldman, Steven, Guhathakurta, Puragra, Marigo, Paola, Mukherjee, Sagnick, Pastorelli, Giada, Quirk, Amanda, Soraisam, Monika, and Trabucchi, Michele. 2020. "PHAT XX. AGB Stars and Other Cool Giants in M31 Star Clusters." The Astrophysical Journal 901:19. https://doi.org/10.3847/1538-4357/abad3a 2020
    • Raymond, John C., Caldwell, Nelson, Fesen, R. A., Weil, K. E., Boumis, P., di Cicco, D., Mittelman, D., and Walker, S. 2020. "Rapid Postshock Cooling and Pressure-driven Shell-phase Evolution of the Galactic Halo SNR G70.0─21.5." The Astrophysical Journal 888:90. https://doi.org/10.3847/1538-4357/ab5e84 2020
    • Bonaca, Ana, Conroy, Charlie, Cargile, Phillip A., Naidu, Rohan P., Johnson, Benjamin D., Zaritsky, Dennis, Ting, Yuan-Sen, Caldwell, Nelson, Han, Jiwon Jesse, and van Dokkum, Pieter. 2020. "Timing the Early Assembly of the Milky Way with the H3 Survey." The Astrophysical Journal 897:L18. https://doi.org/10.3847/2041-8213/ab9caa 2020
    • Johnson, Christian I., Caldwell, Nelson, Michael Rich, R., Mateo, Mario, and Bailey, John I. 2019. "Light element discontinuities suggest an early termination of star formation in the globular cluster NGC 6402 (M14)." Monthly Notices of the Royal Astronomical Society 485:4311-4329. https://doi.org/10.1093/mnras/stz587 2019
    • Conroy, Charlie, Bonaca, Ana, Cargile, Phillip, Johnson, Benjamin D., Caldwell, Nelson, Naidu, Rohan P., Zaritsky, Dennis, Fabricant, Daniel, Moran, Sean, Rhee, Jaehyon, Szentgyorgyi, Andrew, Berlind, Perry, Calkins, Michael L., Kattner, ShiAnne, and Ly, Chun. 2019. "Mapping the Stellar Halo with the H3 Spectroscopic Survey." The Astrophysical Journal 883:107. https://doi.org/10.3847/1538-4357/ab38b8 2019
    • Conroy, Charlie, Naidu, Rohan P., Zaritsky, Dennis, Bonaca, Ana, Cargile, Phillip, Johnson, Benjamin D., and Caldwell, Nelson. 2019. "Resolving the Metallicity Distribution of the Stellar Halo with the H3 Survey." The Astrophysical Journal 887:237. https://doi.org/10.3847/1538-4357/ab5710 2019
    • Mutlu-Pakdil, Burçin, Sand, David J., Walker, Matthew G., Caldwell, Nelson, Carlin, Jeffrey L., Collins, Michelle L., Crnojević, Denija, Mateo, Mario, Olszewski, Edward W., Seth, Anil C., Strader, Jay, Willman, Beth, and Zaritsky, Dennis. 2019. "Signatures of Tidal Disruption in Ultra-faint Dwarf Galaxies: A Combined HST, Gaia, and MMT/Hectochelle Study of Leo V." The Astrophysical Journal 885:53. https://doi.org/10.3847/1538-4357/ab45ec 2019
    • Crnojević, D., Sand, D. J., Bennet, P., Pasetto, S., Spekkens, K., Caldwell, Nelson, Guhathakurta, P., McLeod, Brian A., Seth, A., Simon, J. D., Strader, J., and Toloba, E. 2019. "The Faint End of the Centaurus A Satellite Luminosity Function." The Astrophysical Journal 872:80. https://doi.org/10.3847/1538-4357/aafbe7 2019
    • Bhattacharya, Souradeep, Arnaboldi, Magda, Hartke, Johanna, Gerhard, Ortwin, Comte, Valentin, McConnachie, Alan, and Caldwell, Nelson. 2019. "The survey of planetary nebulae in Andromeda (M 31). I. Imaging the disc and halo with MegaCam at the CFHT." Astronomy and Astrophysics 624:A132. https://doi.org/10.1051/0004-6361/201834579 2019
    • Bhattacharya, Souradeep, Arnaboldi, Magda, Caldwell, Nelson, Gerhard, Ortwin, Blaña, Matías, McConnachie, Alan, Hartke, Johanna, Guhathakurta, Puragra, Pulsoni, Claudia, and Freeman, Kenneth C. 2019. "The survey of planetary nebulae in Andromeda (M 31). II. Age-velocity dispersion relation in the disc from planetary nebulae." Astronomy and Astrophysics 631:A56. https://doi.org/10.1051/0004-6361/201935898 2019
    • Mutlu-Pakdil, Burçin, Sand, David J., Carlin, Jeffrey L., Spekkens, Kristine, Caldwell, Nelson, Crnojevic, Denija, Hughes, Allison K., Willman, Beth, and Zaritsky, Dennis. 2018. "A Deeper Look at the New Milky Way Satellites: Sagittarius II, Reticulum II, Phoenix II, and Tucana III." The Astrophysical Journal 863:25. https://doi.org/10.3847/1538-4357/aacd0e 2018
    • Johnson, Christian I., Rich, R. Michael, Caldwell, Nelson, Mateo, Mario, Bailey, John I., III, Olszewski, Edward W., and Walker, Matthew G. 2018. "Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569." The Astronomical Journal 155:71. https://doi.org/10.3847/1538-3881/aaa294 2018
    • Johnson, Christian I., Caldwell, Nelson, Rich, R. Michael, Mateo, Mario, Bailey, John I., III, Clarkson, William I., Olszewski, Edward W., and Walker, Matthew G. 2017. "A Chemical Composition Survey of the Iron-complex Globular Cluster NGC 6273 (M19)." The Astrophysical Journal 836:168. https://doi.org/10.3847/1538-4357/836/2/168 2017
    • Mikolajewska, Joanna, Shara, Michael M., Caldwell, Nelson, Ilkiewicz, Krystian, and Zurek, David. 2017. "A survey of the Local Group of galaxies for symbiotic binary stars - I. First detection of symbiotic stars in M33." Monthly Notices of the Royal Astronomical Society 465:1699-1710. https://doi.org/10.1093/mnras/stw2937 2017
    • Johnson, Christian I., Caldwell, Nelson, Rich, R. Michael, Mateo, Mario, Bailey, John I., III, Olszewski, Edward W., and Walker, Matthew G. 2017. "Chemical Complexity in the Eu-enhanced Monometallic Globular NGC 5986." The Astrophysical Journal 842:24. https://doi.org/10.3847/1538-4357/aa7414 2017
    • Caldwell, Nelson, Walker, Matthew G., Mateo, Mario, Olszewski, Edward W., Koposov, Sergey, Belokurov, Vasily, Torrealba, Gabriel, Geringer-Sameth, Alex, and Johnson, Christian I. 2017. "Crater 2: An Extremely Cold Dark Matter Halo." The Astrophysical Journal 839:20. https://doi.org/10.3847/1538-4357/aa688e 2017
    • Caldwell, Nelson, Walker, Matthew G., Mateo, Mario, Olszewski, Edward W., Koposov, Sergey, Belokurov, Vasily, Torrealba, Gabriel, Geringer-Sameth, Alex, and Johnson, Christian I. 2017. "Erratum: Crater 2: An Extremely Cold Dark Matter Halo (2017, ApJ, 839, 20)." The Astrophysical Journal 841:66. https://doi.org/10.3847/1538-4357/aa7208 2017
    • Sand, D. J., Seth, A. C., Crnojević, D., Spekkens, K., Strader, J., Adams, E. A. K., Caldwell, Nelson, Guhathakurta, P., Kenney, J., Randall, Scott, Simon, J. D., Toloba, E., and Willman, B. 2017. "Hubble Space Telescope Imaging of the Ultra-compact High Velocity Cloud AGC 226067: A Stripped Remnant in the Virgo Cluster." The Astrophysical Journal 843:134. https://doi.org/10.3847/1538-4357/aa7557 2017
    • Nguyen, Dieu D., Seth, Anil C., den Brok, Mark, Neumayer, Nadine, Cappellari, Michele, Barth, Aaron J., Caldwell, Nelson, Williams, Benjamin F., and Binder, Breanna. 2017. "Improved Dynamical Constraints on the Mass of the Central Black Hole in NGC 404." The Astrophysical Journal 836:237. https://doi.org/10.3847/1538-4357/aa5cb4 2017
    • Johnson, Christian I., Caldwell, Nelson, Rich, R. Michael, and Walker, Matthew G. 2017. "Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229." The Astronomical Journal 154:155. https://doi.org/10.3847/1538-3881/aa86ac 2017
    • Caldwell, Nelson, Strader, Jay, Sand, David J., Willman, Beth, and Seth, Anil C. 2017. "The Faint Globular Cluster in the Dwarf Galaxy Andromeda I." Publications of the Astronomical Society of Australia 34:e039. https://doi.org/10.1017/pasa.2017.35 2017
    • Toloba, Elisa, Sand, David J., Spekkens, Kristine, Crnojevic, Denija, Simon, Joshua D., Guhathakurta, Puragra, Strader, Jay, Caldwell, Nelson, McLeod, Brian A., and Seth, Anil C. 2016. "A Tidally Disrupting Dwarf Galaxy in the Halo of NGC 253." The Astrophysical Journal Letters, 816, L5. IOP Publishing, https://doi.org/10.3847/2041-8205/816/1/L5. 2016
    • Hargis, Jonathan R., Kimmig, Brian, Willman, Beth, Caldwell, Nelson, Walker, Matthew G., Strader, Jay, Sand, David J., Grillmair, Carl J., and Yoon, Joo Heon. 2016. "Evidence That Hydra I is a Tidally Disrupting Milky Way Dwarf Galaxy." The Astrophysical Journal 818:39. https://doi.org/10.3847/0004-637X/818/1/39 2016
    • Sakari, Charli M., Shetrone, Matthew D., Schiavon, Ricardo P., Bizyaev, Dmitry, Allende Prieto, Carlos, Beers, Timothy C., Caldwell, Nelson, García-Hernández, D. A., Lucatello, Sara, Majewski, Steven, O'Connell, Robert W., Pan, Kaike, and Strader, Jay. 2016. "Infrared High-resolution Integrated Light Spectral Analyses of M31 Globular Clusters from APOGEE." The Astrophysical Journal 829:116. https://doi.org/10.3847/0004-637X/829/2/116 2016
    • Johnson, Christian I., Caldwell, Nelson, Rich, R. Michael, Pilachowski, Catherine A., and Hsyu, Tiffany. 2016. "The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366." The Astronomical Journal 152:21. https://doi.org/10.3847/0004-6256/152/1/21 2016
    • The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366The Astronomical Journal.  152:21. 2016
    • Crnojević, D., Sand, D. J., Spekkens, K., Caldwell, Nelson, Guhathakurta, P., McLeod, Brian A., Seth, A., Simon, J. D., Strader, J., and Toloba, E. 2016. "The Extended Halo of Centaurus A: Uncovering Satellites, Streams, and Substructures." The Astrophysical Journal, 823 19. https://doi.org/10.3847/0004-637X/823/1/19. 2016
    • Shara, Michael M., Mikolajewska, Joanna, Caldwell, Nelson, Ilkiewicz, Krystian, Drozd, Katarzyna, and Zurek, David. 2016. "The first transition Wolf-Rayet WN/C star in M31." Monthly Notices of the Royal Astronomical Society 455:3453-3457. https://doi.org/10.1093/mnras/stv2455 2016
    • Benetti, S., Chugai, N. N., Utrobin, V. P., Cappellaro, E., Patat, F., Pastorello, A., Turatto, M., Cupani, G., Neuhäuser, R., Caldwell, Nelson, Pignata, G., and Tomasella, L. 2016. "The spectacular evolution of Supernova 1996al over 15 yr: a low-energy explosion of a stripped massive star in a highly structured environment." Monthly Notices of the Royal Astronomical Society, 456 3296–3317. https://doi.org/10.1093/mnras/stv2811. 2016
    • Sand, D. J., Crnojević, D., Bennet, P., Willman, B., Hargis, J., Strader, J., Olszewski, E., Tollerud, E. J., Simon, J. D., Caldwell, Nelson, Guhathakurta, P., James, B. L., Koposov, S., McLeod, Brian A., Morrell, N., Peacock, M., Salinas, R., Seth, A. C., Stark, D. P., and Toloba, E. 2015. "A Comprehensive Archival Search for Counterparts to Ultra-compact High-Velocity Clouds: Five Local Volume Dwarf Galaxies." The Astrophysical Journal, 806 95. https://doi.org/10.1088/0004-637X/806/1/95. 2015
    • Pota, Vincenzo, Brodie, Jean P., Bridges, Terry, Strader, Jay, Romanowsky, Aaron J., Villaume, Alexa, Jennings, Zach, Faifer, Favio R., Pastorello, Nicola, Forbes, Duncan A., Campbell, Ainsley, Usher, Christopher, Foster, Caroline, Spitler, Lee R., Caldwell, Nelson, Forte, Juan C., Norris, Mark A., Zepf, Stephen E., Beasley, Michael A., Gebhardt, Karl, Hanes, David A., Sharples, Ray M., and Arnold, Jacob A. 2015. "A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system." Monthly Notices of the Royal Astronomical Society 450:1962-1983. https://doi.org/10.1093/mnras/stv677 2015
    • Johnson, Christian I., Rich, R. Michael, Pilachowski, Catherine A., Caldwell, Nelson, Mateo, Mario, Bailey, John I., III, and Crane, Jeffrey D. 2015. "A Spectroscopic Analysis of the Galactic Globular Cluster NGC 6273 (M19)." The Astronomical Journal 150:63. https://doi.org/10.1088/0004-6256/150/2/63 2015
    • Mikolajewska, Joanna, Caldwell, Nelson, Shara, Michael M., and Ilkiewicz, Krystian. 2015. "Characterization of the Most Luminous Star in M33: A Super Symbiotic Binary." The Astrophysical Journal Letters, 799, L16. IOP Publishing, https://doi.org/10.1088/2041-8205/799/2/L16. 2015
    • Kimmig, Brian, Seth, Anil, Ivans, Inese I., Strader, Jay, Caldwell, Nelson, Anderton, Tim, and Gregersen, Dylan. 2015. "Measuring Consistent Masses for 25 Milky Way Globular Clusters." The Astronomical Journal 149:53. https://doi.org/10.1088/0004-6256/149/2/53 2015
    • McLeod, Brian A., Geary, John, Conroy, Maureen, Fabricant, Daniel, Ordway, Mark, Szentgyorgyi, Andrew H., Amato, Stephen, Ashby, Matthew L. N., Caldwell, Nelson, Curley, Dylan, Gauron, Thomas, Holman, Matthew, Norton, Timothy, Pieri, Mario, Roll, John, Weaver, David, Zajac, Joseph, Palunas, Povilas, and Osip, David. 2015. "Megacam: A Wide-Field CCD Imager for the MMT and Magellan." Publications of the Astronomical Society of the Pacific 127:366-382. https://doi.org/10.1086/680687 2015
    • Johnson, L. Clifton, Seth, Anil C., Dalcanton, Julianne J., Wallace, Matthew L., Simpson, Robert J., Lintott, Chris J., Kapadia, Amit, Skillman, Evan D., Caldwell, Nelson, Fouesneau, Morgan, Weisz, Daniel R., Williams, Benjamin F., Beerman, Lori C., Gouliermis, Dimitrios A., and Sarajedini, Ata. 2015. "PHAT Stellar Cluster Survey. II. Andromeda Project Cluster Catalog." The Astrophysical Journal 802:127. https://doi.org/10.1088/0004-637X/802/2/127 2015
    • Sesar, Branimir, Bovy, Jo, Bernard, Edouard J., Caldwell, Nelson, Cohen, Judith G., Fouesneau, Morgan, Johnson, Christian I., Ness, Melissa, Ferguson, Annette M. N., Martin, Nicolas F., Price-Whelan, Adrian M., Rix, Hans-Walter, Schlafly, Edward F., Burgett, William S., Chambers, Kenneth C., Flewelling, Heather, Hodapp, Klaus W., Kaiser, Nick, Magnier, Eugene A., Platais, Imants, Tonry, John L., Waters, Christopher, and Wyse, Rosemary F. G. 2015. "The Nature and Orbit of the Ophiuchus Stream." The Astrophysical Journal 809:59. https://doi.org/10.1088/0004-637X/809/1/59 2015
    • Zhang, Hong-Xin, Peng, Eric W., Côté, Patrick, Liu, Chengze, Ferrarese, Laura, Cuillandre, Jean-Charles, Caldwell, Nelson, Gwyn, Stephen D. J., Jordán, Andrés, Lançon, Ariane, Li, Biao, Muñoz, Roberto P., Puzia, Thomas H., Bekki, Kenji, Blakeslee, John P., Boselli, Alessandro, Drinkwater, Michael J., Duc, Pierre-Alain, Durrell, Patrick, Emsellem, Eric, Firth, Peter, and Sánchez-Janssen, Rubén. 2015. "The Next Generation Virgo Cluster Survey. VI. The Kinematics of Ultra-compact Dwarfs and Globular Clusters in M87." The Astrophysical Journal 802:30. https://doi.org/10.1088/0004-637X/802/1/30 2015
    • Caldwell, Nelson, Strader, Jay, Romanowsky, Aaron J., Brodie, Jean P., Moore, Ben, Diemand, Jurg, and Martizzi, Davide. 2014. "A Globular Cluster toward M87 with a Radial Velocity < - 1000 km s-1: The First Hypervelocity Cluster." The Astrophysical Journal Letters, 787, L11. IOP Publishing, https://doi.org/10.1088/2041-8205/787/1/L11. 2014
    • Crnojević, D., Sand, D. J., Caldwell, Nelson, Guhathakurta, P., McLeod, Brian A., Seth, A., Simon, J. D., Strader, J., and Toloba, E. 2014. "Discovery of a Close Pair of Faint Dwarf Galaxies in the Halo of Centaurus A." The Astrophysical Journal Letters, 795 L35. https://doi.org/10.1088/2041-8205/795/2/L35. 2014
    • Sand, D. J., Crnojević, D., Strader, J., Toloba, E., Simon, J. D., Caldwell, Nelson, Guhathakurta, P., McLeod, Brian A., and Seth, A. C. 2014. "Discovery of a New Faint Dwarf Galaxy Associated with NGC 253." The Astrophysical Journal Letters, 793 L7. https://doi.org/10.1088/2041-8205/793/1/L7. 2014
    • Medina, Amber A., Raymond, John C., Edgar, Richard J., Caldwell, Nelson, Fesen, Robert A., and Milisavljevic, Dan. 2014. "Electron-Ion Equilibrium and Shock Precursors in the Northeast Limb of the Cygnus Loop." The Astrophysical Journal 791:30. https://doi.org/10.1088/0004-637X/791/1/30 2014
    • Mikołajewska, Joanna, Caldwell, Nelson, and Shara, Michael M. 2014. "First detection and characterization of symbiotic stars in M31." Monthly Notices of the Royal Astronomical Society 444:586-599. https://doi.org/10.1093/mnras/stu1480 2014
    • Veyette, Mark J., Williams, Benjamin F., Dalcanton, Julianne J., Balick, Bruce, Caldwell, Nelson, Fouesneau, Morgan, Girardi, Léo, Gordon, Karl D., Kalirai, Jason, Rosenfield, Philip, and Seth, Anil C. 2014. "Panchromatic Hubble Andromeda Treasury. IX. A Photometric Survey of Planetary Nebulae in M31." The Astrophysical Journal 792:121. https://doi.org/10.1088/0004-637X/792/2/121 2014
    • Bochanski, John J., Willman, Beth, Caldwell, Nelson, Sanderson, Robyn, West, Andrew A., Strader, Jay, and Brown, Warren. 2014. "The Most Distant Stars in the Milky Way." The Astrophysical Journal Letters, 790, L5. IOP Publishing, https://doi.org/10.1088/2041-8205/790/1/L5. 2014
    • Zhu, Ling, Long, R. J., Mao, Shude, Peng, Eric W., Liu, Chengze, Caldwell, Nelson, Li, Biao, Blakeslee, John P., Côté, Patrick, Cuillandre, Jean-Charles, Durrell, Patrick, Emsellem, Eric, Ferrarese, Laura, Gwyn, Stephen, Jordán, Andrés, Lançon, Ariane, Mei, Simona, Muñoz, Roberto, and Puzia, Thomas. 2014. "The Next Generation Virgo Cluster Survey. V. Modeling the Dynamics of M87 with the Made-to- measure Method." The Astrophysical Journal 792:59. https://doi.org/10.1088/0004-637X/792/1/59 2014
    • Fouesneau, Morgan, Johnson, L. Clifton, Weisz, Daniel R., Dalcanton, Julianne J., Bell, Eric F., Bianchi, Luciana, Caldwell, Nelson, Gouliermis, Dimitrios A., Guhathakurta, Puragra, Kalirai, Jason, Larsen, Søren S., Rix, Hans-Walter, Seth, Anil C., Skillman, Evan D., and Williams, Benjamin F. 2014. "The Panchromatic Hubble Andromeda Treasury. V. Ages and Masses of the Year 1 Stellar Clusters." The Astrophysical Journal 786:117. https://doi.org/10.1088/0004-637X/786/2/117 2014
    • Kim, Sooyoung, Yoon, Suk-Jin, Chung, Chul, Caldwell, Nelson, Schiavon, Ricardo P., Kang, Yongbeom, Rey, Soo-Chang, and Lee, Young-Wook. 2013. "Nonlinear Color-Metallicity Relations of Globular Clusters. V. Nonlinear Absorption-line Index versus Metallicity Relations and Bimodal Index Distributions of M31 Globular Clusters." The Astrophysical Journal 768:138. https://doi.org/10.1088/0004-637X/768/2/138 2013
    • Schiavon, Ricardo P., Caldwell, Nelson, Conroy, Charlie, Graves, Genevieve J., Strader, Jay, MacArthur, Lauren A., Courteau, Stéphane, and Harding, Paul. 2013. "Star Clusters in M31. V. Evidence for Self-enrichment in Old M31 Clusters from Integrated Spectroscopy." The Astrophysical Journal Letters, 776, L7. IOP Publishing, https://doi.org/10.1088/2041-8205/776/1/L7. 2013
    • Strader, Jay, Seth, Anil C., Forbes, Duncan A., Fabbiano, Giuseppina, Romanowsky, Aaron J., Brodie, Jean P., Conroy, Charlie, Caldwell, Nelson, Pota, Vincenzo, Usher, Christopher, and Arnold, Jacob A. 2013. "The Densest Galaxy." The Astrophysical Journal Letters, 775, L6. IOP Publishing, https://doi.org/10.1088/2041-8205/775/1/L6. 2013
    • Kochanek, C. S., Eisenstein, D. J., Cool, R. J., Caldwell, Nelson, Assef, R. J., Jannuzi, B. T., Jones, C., Murray, Stephen S., Forman, W. R., Dey, A., Brown, M. J. I., Eisenhardt, P., Gonzalez, A. H., Green, P., and Stern, D. 2012. "AGES: The AGN and Galaxy Evolution Survey." The Astrophysical Journal Supplement Series, 200 8. https://doi.org/10.1088/0067-0049/200/1/8. 2012
    • Hicken, Malcolm, Challis, Peter, Kirshner, Robert P., Rest, Armin, Cramer, Claire E., Wood-Vasey, W., Bakos, Gaspar, Berlind, Perry, Brown, Warren R., Caldwell, Nelson, Calkins, Mike, Currie, Thayne, de Kleer, Kathy, Esquerdo, Gilbert, Everett, Mark, Falco, Emilio, Fernandez, Jose, Friedman, Andrew S., Groner, Ted, Hartman, Joel, Holman, Matthew J., Hutchins, Robert, Keys, Sonia, Kipping, David, Latham, Dave et al. 2012. "CfA4: Light Curves for 94 Type Ia Supernovae." The Astrophysical Journal Supplement Series 200:12. https://doi.org/10.1088/00670049/200/2/12 2012
    • Strader, Jay, Seth, Anil C., and Caldwell, Nelson. 2012. "Old Massive Globular Clusters and the Stellar Halo of the Dwarf Starburst Galaxy NGC 4449." The Astronomical Journal, 143, (2). https://doi.org/10.1088/0004-6256/143/2/52. 2012
    • Johnson, L. C., Seth, Anil C., Dalcanton, Julianne J., Caldwell, Nelson, Fouesneau, Morgan, Gouliermis, Dimitrios A., Hodge, Paul W., Larsen, Sø, Olsen, Knut A. G., San Roman, Izaskun, Sarajedini, Ata, Weisz, Daniel R., Williams, Benjamin F., Beerman, Lori C., Bianchi, Luciana, Dolphin, Andrew E., Girardi, Léo, Guhathakurta, Puragra, Kalirai, Jason, Lang, Dustin, Monachesi, Antonela, Nanda, Sanjay, Rix, Hans-Walter, and Skillman, Evan D. 2012. "PHAT Stellar Cluster Survey. I. Year 1 Catalog and Integrated Photometry." The Astrophysical Journal 752:95. https://doi.org/10.1088/0004-637X/752/2/95 2012
    • Cool, Richard J., Eisenstein, Daniel J., Kochanek, Christopher S., Brown, Michael J. I., Caldwell, Nelson, Dey, Arjun, Forman, William R., Hickox, Ryan C., Jannuzi, Buell T., Jones, Christine, Moustakas, John, and Murray, Stephen S. 2012. "The Galaxy Optical Luminosity Function from the AGN and Galaxy Evolution Survey." The Astrophysical Journal 748:10. https://doi.org/10.1088/0004-637X/748/1/10 2012
    • Sanders, Nathan E., Caldwell, Nelson, McDowell, Jonathan, and Harding, Paul. 2012. "The Metallicity Profile of M31 from Spectroscopy of Hundreds of H II Regions and PNe." The Astrophysical Journal 758:133. https://doi.org/10.1088/0004-637X/758/2/133 2012
    • Dalcanton, Julianne J., Williams, Benjamin F., Lang, Dustin, Lauer, Tod R., Kalirai, Jason S., Seth, Anil C., Dolphin, Andrew, Rosenfield, Philip, Weisz, Daniel R., Bell, Eric F., Bianchi, Luciana C., Boyer, Martha L., Caldwell, Nelson, Dong, Hui, Dorman, Claire E., Gilbert, Karoline M., Girardi, Léo, Gogarten, Stephanie M., Gordon, Karl D., Guhathakurta, Puragra, Hodge, Paul W., Holtzman, Jon A., Johnson, L. C., Larsen, Sø, Lewis, Alexia et al. 2012. "The Panchromatic Hubble Andromeda Treasury." The Astrophysical Journal Supplement Series 200:18. https://doi.org/10.1088/0067-0049/200/2/18 2012
    • Sand, David J., Strader, Jay, Willman, Beth, Zaritsky, Dennis, McLeod, Brian A., Caldwell, Nelson, Seth, Anil, and Olszewski, Edward. 2012. "Tidal Signatures in the Faintest Milky Way Satellites: The Detailed Properties of Leo V, Pisces II, and Canes Venatici II." The Astrophysical Journal 756:79. https://doi.org/10.1088/0004-637X/756/1/79 2012
    • Hickox, Ryan C., Myers, Adam D., Brodwin, Mark, Alexander, David M., Forman, William R., Jones, Christine, Murray, Stephen S., Brown, Michael J. I., Cool, Richard J., Kochanek, Christopher S., Dey, Arjun, Jannuzi, Buell T., Eisenstein, Daniel, Assef, Roberto J., Eisenhardt, Peter R., Gorjian, Varoujan, Stern, Daniel, Le Floc'h, Emeric, Caldwell, Nelson, Goulding, Andrew D., and Mullaney, James R. 2011. "Clustering of Obscured and Unobscured Quasars in the Boötes Field: Placing Rapidly Growing Black Holes in the Cosmic Web." The Astrophysical Journal 731 (2):117. https://doi.org/10.1088/0004-637X/731/2/117 2011
    • Szentgyorgyi, Andrew H., Furesz, Gabor, Cheimets, Peter, Conroy, Maureen, Eng, Roger, Fabricant, Daniel, Fata, Robert, Gauron, Thomas, Geary, John, McLeod, Brian A., Zajac, Joseph, Amato, Stephen, Bergner, Henry, Caldwell, Nelson, Dupree, Andrea, Goddard, Richard, Johnston, Everett, Meibom, Søren, Mink, Douglas, Pieri, Mario, Roll, John, Tokarz, Susan, Wyatt, William, Epps, Harland, Hartmann, Lee et al. 2011. "Hectochelle: A Multiobject Optical Echelle Spectrograph for the MMT." Publications of the Astronomical Society of the Pacific 123:1188-1209. https://doi.org/10.1086/662209 2011
    • Caldwell, Nelson, Schiavon, Ricardo, Morrison, Heather, Rose, James A., and Harding, Paul. 2011. "Star Clusters in M31. II. Old Cluster Metallicities and Ages from Hectospec Data." The Astronomical Journal, 141, (2) 61. https://doi.org/10.1088/0004-6256/141/2/61. 2011
    • Caldwell, Nelson, Morrison, Heather, Kenyon, Scott J., Schiavon, Ricardo, Harding, Paul, and Rose, James A. 2010. "A Star in the M31 Giant Stream: The Highest Negative Stellar Velocity Known." The Astronomical Journal 139:372-377. https://doi.org/10.1088/0004-6256/139/2/372 2010
    • Seth, Anil C., Cappellari, Michele, Neumayer, Nadine, Caldwell, Nelson, Bastian, Nate, Olsen, Knut, Blum, Robert D., Debattista, Victor P., McDermid, Richard, Puzia, Thomas, and Stephens, Andrew. 2010. "The NGC 404 Nucleus: Star Cluster and Possible Intermediate-mass Black Hole." The Astrophysical Journal 714:713-731. https://doi.org/10.1088/0004-637X/714/1/713 2010
    • Brown, Michael J. I., Moustakas, John, Caldwell, Nelson, Palamara, David, Cool, Richard J., Dey, Arjun, Hickox, Ryan C., Jannuzi, Buell T., Murray, Stephen S., and Zaritsky, Dennis. 2009. "Active Galactic Nuclei and the Truncation of Star Formation in K A Galaxies." The Astrophysical Journal 703:150-158. 2009
    • Seth, Anil C., Blum, Robert D., Bastian, Nate, Caldwell, Nelson, Debattista, Victor P., and Puzia, Thomas H. 2009. "Erratum: "The Rotating Nuclear Star Cluster in NGC 4244" (2008, ApJ, 687, 997)." The Astrophysical Journal, 693 1959. 2009
    • Hickox, Ryan C., Jones, Christine, Forman, William R., Murray, Stephen S., Kochanek, Christopher S., Eisenstein, Daniel, Jannuzi, Buell T., Dey, Arjun, Brown, Michael J. I., Stern, Daniel, Eisenhardt, Peter R., Gorjian, Varoujan, Brodwin, Mark, Narayan, Ramesh, Cool, Richard J., Kenter, Almus, Caldwell, Nelson, and Anderson, Michael E. 2009. "Host Galaxies, Clustering, Eddington Ratios, and Evolution of Radio, X-Ray, and Infrared- Selected AGNs." The Astrophysical Journal 696:891-919. https://doi.org/10.1088/0004-637X/696/1/891 2009
    • Caldwell, Nelson, Harding, Paul, Morrison, Heather, Rose, James A., Schiavon, Ricardo, and Kriessler, Jeff. 2009. "Star Clusters in M31. I. A Catalog and a Study of the Young Clusters." The Astronomical Journal 137:94-110. https://doi.org/10.1088/0004-6256/137/1/94 2009
    • Drout, Maria R., Massey, Philip, Meynet, Georges, Tokarz, Susan, and Caldwell, Nelson. 2009. "Yellow Supergiants in the Andromeda Galaxy (M31)." The Astrophysical Journal 703:441-460. 2009
    • Assef, R. J., Kochanek, C. S., Brodwin, Mark, Brown, Michael J. I., Caldwell, Nelson, Cool, R. J., Eisenhardt, P., Eisenstein, D., Gonzalez, A. H., Jannuzi, B. T., Jones, C., McKenzie, E., Murray, S. S., and Stern, D. 2008. "Low-Resolution Spectral Templates for Galaxies from 0.2 to 10 ?m." The Astrophysical Journal 676:286-303. 2008
    • Fabricant, Daniel G., Kurtz, Michael J., Geller, Margaret J., Caldwell, Nelson, Woods, Deborah, and Dell'Antonio, Ian. 2008. "Spectrophotometry with Hectospec, the MMT's Fiber-Fed Spectrograph." Publications of the Astronomical Society of the Pacific 120:1222-1232. 2008
    • Hickox, R. C., Jones, C., Forman, William R., Murray, Stephen S., Brodwin, Mark, Brown, Michael J. I., Eisenhardt, P. R., Stern, D., Kochanek, C. S., Eisenstein, D., Cool, R. J., Jannuzi, B. T., Dey, A., Brand, Kate, Gorjian, V., and Caldwell, Nelson. 2007. "A Large Population of Mid-Infrared-selected, Obscured Active Galaxies in the Bo”tes Field." The Astrophysical Journal 671:1365-1387. 2007

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