Skip to main content
eScholarship
Open Access Publications from the University of California

Eddington-limited Accretion in z ∼ 2 WISE-selected Hot, Dust-obscured Galaxies

  • Author(s): Wu, J
  • Jun, HD
  • Assef, RJ
  • Tsai, CW
  • Wright, EL
  • Eisenhardt, PRM
  • Blain, A
  • Stern, D
  • Díaz-Santos, T
  • Denney, KD
  • Hayden, BT
  • Perlmutter, S
  • Aldering, G
  • Boone, K
  • Fagrelius, P
  • et al.
Abstract

Hot, dust-obscured galaxies, or "Hot DOGs," are a rare, dusty, hyperluminous galaxy population discovered by the WISE mission. Predominantly at redshifts 2-3, they include the most luminous known galaxies in the universe. Their high luminosities likely come from accretion onto highly obscured supermassive black holes (SMBHs). We have conducted a pilot survey to measure the SMBH masses of five z ∼ 2 Hot DOGs via broad Hα emission lines, using Keck/MOSFIRE and Gemini/FLAMINGOS-2. We detect broad Hα emission in all five Hot DOGs. We find substantial corresponding SMBH masses for these Hot DOGs (∼ 109 M⊙), and their derived Eddington ratios are close to unity. These z ∼ 2 Hot DOGs are the most luminous active galactic nuclei for their BH masses, suggesting that they are accreting at the maximum rates for their BHs. A similar property is found for known z ∼ 6 quasars. Our results are consistent with scenarios in which Hot DOGs represent a transitional, high-accretion phase between obscured and unobscured quasars. Hot DOGs may mark a special evolutionary stage before the red quasar and optical quasar phases, and they may be present at other cosmic epochs.

Main Content
Current View