A Closer Look at Two of the Most Luminous Quasars in the Universe

Abstract

Ultra-luminous quasars ($M_{1450}\le -29$) provide us with a rare view into the nature of the most massive and most rapidly accreting supermassive black holes (SMBHs). Following the discovery of two of these extreme sources, J0341$+$1720 ($M_{1450}=-29.56$, $z=3.71$) and J2125$-$1719 ($M_{1450}=-29.39$, $z=3.90$), in the Extremely Luminous Quasar Survey (ELQS) and its extension to the Pan-STARRS\,1 footprint (PS-ELQS), we herein present an analysis of their rest-frame UV to optical spectroscopy. Both quasars harbor very massive SMBHs with $M_{\mathrm{BH}}=6.73_{-0.83}^{+0.75}\times 10^9{M}_{\odot }$ and $M_{\mathrm{BH}}=5.45_{-0.55}^{+0.60}\times 10^9{M}_{\odot }$, respectively, showing evidence of accretion above the Eddington limit ($L_{\mathrm{bol}}/L_{\mathrm{Edd}}=2.74_{-0.27}^{+0.39}$ and $L_{\mathrm{bol}}/L_{\mathrm{Edd}}=3.01_{-0.30}^{+0.34}$). NOEMA 3 millimeter observations of J0341$+$1720 reveal a highly star-forming ($\mathrm{SFR}\approx 1500{\mathrm{M}}_{\odot }{\mathrm{yr}}^{-1}$), ultra-luminous infrared galaxy ($L_{\mathrm{TIR}}\approx 1.0\times 10^{13}{L}_{\odot }$) host, which, based on an estimate of its dynamical mass, is only $\sim 30$ times more massive than the SMBH it harbors at its center. As examples of luminous super-Eddington accretion, these two quasars provide support for theories, which explain the existence of billion solar mass SMBHs $\sim 700$ million years after the Big Bang by moderate super-Eddington growth from standard SMBH seeds.

Accepted for publication in the Astrophysical Journal (ApJ)

References in corpus (34)

• The NumPy array: a structure for efficient numerical computation
• The Gaia mission
• A Catalog of Quasar Properties from SDSS DR7
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• Pōniuā'ena: A Luminous $z=7.5$ Quasar Hosting a 1.5 Billion Solar Mass Black Hole
• 350 Micron Dust Emission from High Redshift Quasars
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• How Mergers May Affect The Mass Scaling Relations Between Black Holes, Galaxies, and Other Gravitationally Bound Systems
• Fe II Emission in 14 Low-Redshift Quasars: I - Observations
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• Correcting CIV-Based Virial Black Hole Masses
• The Half Million Quasars (HMQ) Catalogue
• Kiloparsec-scale ALMA Imaging of [CII] and Dust Continuum Emission of 27 Quasar Host Galaxies at z~6
• Correcting for Telluric Absorption: Methods, Case Studies, and Release of the TelFit Code
• Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• A downturn in intergalactic CIV as redshift 6 is approached
• Copious Amounts of Dust and Gas in a z=7.5 Quasar Host Galaxy
• The X-SHOOTER/ALMA sample of Quasars in the Epoch of Reionization. I. NIR spectral modeling, iron enrichment and broad emission line properties
• Molecular gas in three z~7 quasar host galaxies
• No evidence for [CII] halos or high-velocity outflows in z>6 quasar host galaxies
• Spatially Resolved Interstellar Medium and Highly-Excited Dense Molecular Gas in the Most Luminous Quasar at z=6.327
• No Redshift Evolution in the Broad Line Region Metallicity up to z=7.54: Deep NIR Spectroscopy of ULAS J1342+0928
• The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon
• The Extremely Luminous Quasar Survey (ELQS) in the SDSS footprint I.: Infrared Based Candidate Selection
• An ultra-luminous quasar at z=5.363 with a ten billion solar mass black hole and a Metal-Rich DLA at z~5
• The FeII/MgII flux ratio of low-luminosity quasars at z~3
• ALMA Observations of Quasar Host Galaxies at $z\simeq 4.8$
• SDSS J013127.34$-$032100.1: A newly discovered radio-loud quasar at $z=5.18$ with extremely high luminosity
• The spectroscopic follow-up of the QUBRICS bright quasar survey
• The Extremely Luminous Quasar Survey in the Pan-STARRS 1 Footprint (PS-ELQS)
• Ultra-luminous quasars at redshift $z>4.5$ from SkyMapper
• A Thirty-Four Billion Solar Mass Black Hole in SMSS J2157-3602, the Most Luminous Known Quasar
• An Extremely Bright QSO at $z=2.89$

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