Discovery of the most luminous quasar of the last 9 Gyr
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Published:2022
Issue:
Volume:39
Page:
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ISSN:1323-3580
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Container-title:Publications of the Astronomical Society of Australia
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language:en
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Short-container-title:Publ. Astron. Soc. Aust.
Author:
Onken Christopher A.ORCID, Lai (赖民希) SamuelORCID, Wolf ChristianORCID, Lucy Adrian B.ORCID, Hon Wei JeatORCID, Tisserand PatrickORCID, Sokoloski Jennifer L.ORCID, Luna Gerardo J. M.ORCID, Manick RajeevORCID, Fan XiaohuiORCID, Bian (边福彦) FuyanORCID
Abstract
Abstract
We report the discovery of a bright (
$g = 14.5$
mag (AB),
$K = 11.9$
mag (Vega)) quasar at redshift
$z=0.83$
— the optically brightest (unbeamed) quasar at
$z>0.4$
. SMSS J114447.77-430859.3, at a Galactic latitude of
$b=+18.1^{\circ}$
, was identified by its optical colours from the SkyMapper Southern Survey (SMSS) during a search for symbiotic binary stars. Optical and near-infrared spectroscopy reveals broad Mg ii, H
$\unicode{x03B2}$
, H
$\unicode{x03B1}$
, and Pa
$\unicode{x03B2}$
emission lines, from which we measure a black hole mass of
$\log_{10}\! (M_{\mathrm{BH}}/\mathrm{M}_{\odot}) = 9.4 \pm 0.5$
. With its high luminosity,
$L_{\mathrm{bol}} = (4.7\pm1.0)\times10^{47}\,\mathrm{erg\,s}^{-1}$
or
$M_{i}(z=2) = -29.74$
mag (AB), we estimate an Eddington ratio of
$\approx1.4$
. As the most luminous quasar known over the last
${\sim}$
9 Gyr of cosmic history, having a luminosity
$8\times$
greater than 3C 273, the source offers a range of potential follow-up opportunities.
Publisher
Cambridge University Press (CUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Reference136 articles.
1. Bish, H. V. , Werk, J. K. , Peek, J. , Zheng, Y. , & Putman, M. 2021, ApJ, 912, 8 2. Gravity Collaboration, , et al. 2018, Nature, 563, 657 3. Sandage, A. 1965, ApJ, 141, 1560 4. Mainzer, A., et al. 2014, ApJ, 792, 30 5. Wolf, C. , et al. 2018a, PASA, 35, e010
Cited by
2 articles.
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