S22A0074
S22A0074
The dust-obscured galaxy (DOG) is an interesting AGN population since it is possibly in a very active and obscured phase during the co-evolution between a galaxy and a supermassive black hole. Recently we discovered some DOGs with an extremely blue optical color (blue-excess DOGs, hereafter BluDOGs). Our Subaru FOCAS and VLT FORS2 optical spectral observations for 4 BluDOGs show “extreme” properties; a broad C iv emission with an asymmetric velocity profile, and their Eddington ratios are close to or more than one. These properties suggest that BluDOGs are experiencing a “super-critical” accretion, and they are in the blowing-out phase. However such an interesting picture is not conclusive because C iv does not trace the outflow in the scale of the host galaxy, and there is a large uncertainty in the Eddington ratio based on C iv. Here we propose SWIMS spectroscopy for 3 BluDOGs to measure their powerful outflow nature using [O iii] whose velocity profile traces the outflow in the scale of the host galaxy, and their black hole masses and Eddington ratios in a more accurate way using the velocity profiles of Hβ, Hα, or Mg ii. This program will reveal an extremely-evolving AGN population with a “super-critical” accretion.
This document was translated from LATEX by HEVEA.