SHAO Astrophysics Colloquium

Title： Hot dust-obscured galaxies: Catching the maximum SMBH accretion during galaxy evolution

Speaker: Jingwen Wu (NAOC)

Time: 3 pm, June 28 Thursday

Location: Lecture Hall, 3rd floor

Abstract:  

Hot, Dust-Obscured Galaxies, or ”Hot DOGs” are a rare, dusty, hyperluminous galaxy population discovered by the WISE mission. Peaking at redshifts 2-3, they are among the most luminous galaxies in the universe. They likely signpost a key evolutionary stage linking obscured and unobscured quasars. Their high luminosities come from the accretion onto highly obscured super massive black holes (SMBHs).  Our recent studies to measure the BH masses and Eddington ratios of a pilot sample of Hot DOGs (via broad Hα lines) find that Hot DOGs may be accreting at highest possible rates (close to Eddington limit or even above) for their BHs; a similar property is also seen in known z~6 quasars. Our results agree with the expectations of the current merger- driven galaxy evolution model. We propose a ”SMGs/DOGs–Hot DOGs–red quasars–regular quasars” evolutionary sequence.  In this talk, I will introduce how to explain these findings in the context of evolution of obscured and unobscured quasars.