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Title: Eddington-limited Accretion in z ~ 2 WISE -selected Hot, Dust-obscured Galaxies

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 $$z\sim 2$$ 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 ($$\sim {10}^{9}\,{M}_{\odot }$$), and their derived Eddington ratios are close to unity. These $$z\sim 2$$ 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 $$z\sim 6$$ quasars. Our results are consistent with scenarios in which Hot DOGs represent a transitional, high-accretion phase between obscured and unobscured quasars. Finally, 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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [2]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [3];  [6]; ORCiD logo [7];  [7];  [7]; ORCiD logo [7]; ORCiD logo [7]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. Universidad Diego Portales, (Chile)
  4. Univ. of California, Los Angles, CA (United States)
  5. Univ. of Leicester (United Kingdom)
  6. The Ohio State Univ., Columbus, OH (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1544053
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 852; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; galaxies: evolution; high-redshift; ISM; infrared; quasars; supermassive black holes

Citation Formats

Wu, Jingwen, Jun, Hyunsung D., Assef, Roberto J., Tsai, Chao-Wei, Wright, Edward L., Eisenhardt, Peter R. M., Blain, Andrew, Stern, Daniel, Díaz-Santos, Tanio, Denney, Kelly D., Hayden, Brian T., Perlmutter, Saul, Aldering, Greg, Boone, Kyle, and Fagrelius, Parker. Eddington-limited Accretion in z ~ 2 WISE -selected Hot, Dust-obscured Galaxies. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aa9ff3.
Wu, Jingwen, Jun, Hyunsung D., Assef, Roberto J., Tsai, Chao-Wei, Wright, Edward L., Eisenhardt, Peter R. M., Blain, Andrew, Stern, Daniel, Díaz-Santos, Tanio, Denney, Kelly D., Hayden, Brian T., Perlmutter, Saul, Aldering, Greg, Boone, Kyle, & Fagrelius, Parker. Eddington-limited Accretion in z ~ 2 WISE -selected Hot, Dust-obscured Galaxies. United States. doi:10.3847/1538-4357/aa9ff3.
Wu, Jingwen, Jun, Hyunsung D., Assef, Roberto J., Tsai, Chao-Wei, Wright, Edward L., Eisenhardt, Peter R. M., Blain, Andrew, Stern, Daniel, Díaz-Santos, Tanio, Denney, Kelly D., Hayden, Brian T., Perlmutter, Saul, Aldering, Greg, Boone, Kyle, and Fagrelius, Parker. Thu . "Eddington-limited Accretion in z ~ 2 WISE -selected Hot, Dust-obscured Galaxies". United States. doi:10.3847/1538-4357/aa9ff3. https://www.osti.gov/servlets/purl/1544053.
@article{osti_1544053,
title = {Eddington-limited Accretion in z ~ 2 WISE -selected Hot, Dust-obscured Galaxies},
author = {Wu, Jingwen and Jun, Hyunsung D. and Assef, Roberto J. and Tsai, Chao-Wei and Wright, Edward L. and Eisenhardt, Peter R. M. and Blain, Andrew and Stern, Daniel and Díaz-Santos, Tanio and Denney, Kelly D. and Hayden, Brian T. and Perlmutter, Saul and Aldering, Greg and Boone, Kyle and Fagrelius, Parker},
abstractNote = {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 $z\sim 2$ 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 ($\sim {10}^{9}\,{M}_{\odot }$), and their derived Eddington ratios are close to unity. These $z\sim 2$ 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 $z\sim 6$ quasars. Our results are consistent with scenarios in which Hot DOGs represent a transitional, high-accretion phase between obscured and unobscured quasars. Finally, 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.},
doi = {10.3847/1538-4357/aa9ff3},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 852,
place = {United States},
year = {2018},
month = {1}
}

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