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Hot Dust-Obscured Galaxies with Excess Blue Light by Assef, R. J.; Brightman, M.; Walton, D. J.; Stern, D.; Bauer, F. E.; Blain, A. W.; Diaz-Santos, T.; Eisenhardt, P. R. M.; Hickox, R. C.; Jun, H. D.; Psychogyios, A.; Tsai, C. -W.; Wu, J. W. is a scholarly article available to read on EtoBox.

What is Hot Dust-Obscured Galaxies with Excess Blue Light about?

Hot Dust-Obscured Galaxies (Hot DOGs) are among the most luminous galaxies in the Universe. Powered by highly obscured, possibly Compton-thick, active galactic nuclei (AGNs), Hot DOGs are characterized by SEDs that are very red in the mid-IR yet dominated by the host galaxy stellar emission in the UV and optical. An earlier study identified a sub-sample of Hot DOGs with significantly enhanced UV emission. One target, W0204-0506, was studied in detail and, based on Chandra observations, it was concluded that the enhanced emission was most likely due to either extreme unobscured star-formation (${\rm SFR}>1000~M_{\odot}~\rm yr^{-1}$) or to light from the highly obscured AGN scattered by gas or dust into our line of sight. Here, we present a follow-up study of W0204-0506 as well as two more Hot DOGs with excess UV emission. For the two new objects we obtained Chandra/ACIS-S observations, and for all three targets we obtained HST/WFC3 F555W and F160W imaging. We conclude that the excess UV emission is primarily dominated by light from the central highly obscured, hyper-luminous AGN that has been scattered into our line of sight. We cannot rule out, however, that star-formation may sign

Author

Assef, R. J.; Brightman, M.; Walton, D. J.; Stern, D.; Bauer, F. E.; Blain, A. W.; Diaz-Santos, T.; Eisenhardt, P. R. M.; Hickox, R. C.; Jun, H. D.; Psychogyios, A.; Tsai, C. -W.; Wu, J. W.

Published

2019

Language

EN