Barentsen, Geert, Farnhill, H. J., Drew, J. E., González-Solares, E. A., Greimel, R., Irwin, M. J., Miszalski, B., Ruhland, C., Groot, P., Mampaso, A., Sale, S. E., Henden, A. A., Aungwerojwit, A., Barlow, M. J., Carter, P. J., Corradi, R. L. M., Drake, Jeremy J., Eislöffel, J., Fabregat, J., Gänsicke, B. T., Gentile Fusillo, N. P., Greiss, S., Hales, A. S., Hodgkin, S., Huckvale, L. et al. 2014. "The second data release of the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS DR2)." Monthly Notices of the Royal Astronomical Society, 444 3230–3257. https://doi.org/10.1093/mnras/stu1651.
The INT/WFC Photometric Hα Survey of the Northern Galactic Plane (IPHAS) is a 1800 deg2 imaging survey covering Galactic latitudes |b| imaging survey covering Galactic latitudes |b| -1) and to a mean 5σ depth of 21.2 (r), 20.0 (i), and 20.3 (Hα) in the Vega magnitude system. We explain the data reduction and quality control procedures, describe and test the global re-calibration, and detail the construction of the new catalogue. We show that the new calibration is accurate to 0.03 mag (root mean square) and recommend a series of quality criteria to select accurate data from the catalogue. Finally, we demonstrate the ability of the catalogue's unique (r - Hα, r - i) diagram to (i) characterize stellar populations and extinction regimes towards different Galactic sightlines and (ii) select and quantify Hα emission-line objects. IPHAS is the first survey to offer comprehensive CCD photometry of point sources across the Galactic plane at visible wavelengths, providing the much-needed counterpart to recent infrared surveys.
