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Paper: HST Morphologies of z ~ 2 Dust Obscured Galaxies
Volume: 408, The Starburst−AGN Connection
Page: 461
Authors: Bussmann, R.S.; Dey, A.
Abstract: We present high spatial resolution Cycle 15 HST imaging of 31 z ~ 2 Dust Obscured Galaxies (DOGs) in the Boötes Field of the NOAO Deep Wide-Field Survey. Although this subset of DOGs have mid-IR spectral features typical of AGN, all but one of the galaxies are spatially extended and not dominated by an unresolved component at rest-frame optical wavelengths. Sérsic profile fitting indicates effective radii of 1-5 kpc, roughly intermediate between SMGs and quiescent BzKs and DRGs. DOG morphologies suggest they are more dynamically relaxed than local ULIRGs. HST imaging of a different sample of DOGs in Boötes observed during Cycle 16 shows qualitative evidence for a higher rate of interaction compared to the Cycle 15 sample. If major mergers are the progenitors of DOGs, then our observations suggest that DOGs may represent various stages of a post-merger evolutionary phase.
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