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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2(496), p. 2309-2314, 2020

DOI: 10.1093/mnras/staa1635

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A thirty-four billion solar mass black hole in SMSS J2157–3602, the most luminous known quasar

Journal article published in 2020 by Christopher A. Onken ORCID, Fuyan Bian ORCID, Xiaohui Fan ORCID, Feige Wang ORCID, Christian Wolf ORCID, Jinyi Yang ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

ABSTRACT From near-infrared spectroscopic measurements of the Mg ii emission line doublet, we estimate the black hole (BH) mass of the quasar, SMSS J215728.21–360215.1, as being (3.4 ± 0.6) × 1010 M⊙ and refine the redshift of the quasar to be z = 4.692. SMSS J2157 is the most luminous known quasar, with a 3000 Å luminosity of (4.7 ± 0.5) × 1047 erg s−1 and an estimated bolometric luminosity of 1.6 × 1048 erg s−1, yet its Eddington ratio is only ∼0.4. Thus, the high luminosity of this quasar is a consequence of its extremely large BH – one of the most massive BHs at z > 4.