Fabbiano, Giuseppina, Paggi, Alessandro, Siemiginowska, Aneta, and Elvis, Martin. 2018. "Chandra Detection of the Circumnuclear Molecular Torus of the Compton-thick Active Galactic Nucleus in NGC 5643." Astrophysical Journal Letters 869:L36. https://doi.org/10.3847/2041-8213/aaf73e
We report a clumpy elongated feature found with deep Chandra Advanced CCD Imaging Spectrometer high-resolution imaging of the Fe Kα line emission in the nuclear region of the Compton-thick active galactic nucleus galaxy NGC 5643. This feature extends for ˜65 pc north to south (N-S). No corresponding feature is seen in the 3.0–6.0 keV continuum. The Fe Kα feature is spatially consistent with the N-S elongation found in the CO(2–1) high-resolution imaging with the Atacama Large Millimeter/submillimeter Array, but slightly more extended than the rotating molecular disk of diameter 26 pc indicated by the kinematics of the CO(2–1) line. The Chandra detection of a corresponding north to south structure in the neutral Fe Kα line would argue for both CO and Fe Kα emission originating from the obscuring torus.