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Discovery of the most luminous quasar of the last 9 Gyr [arxiv.org]:

Title:Discovery of the most luminous quasar of the last 9 Gyr Download PDF [arxiv.org]

Abstract: We report the discovery of a bright (g = 14.5 ABmag, K = 11.9 Vegamag) quasar at redshift z=0.83 -- the optically brightest (unbeamed) quasar at z0.4. SMSS J114447.77-430859.3, at a Galactic latitude of b=+18.1deg, 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 MgII, H-beta, H-alpha, and Pa-beta emission lines, from which we measure a black hole mass of log(M_BH / M_Sun) = 9.4 +/- 0.5. With its high luminosity, L_bol = (4.7 +/- 1.0) * 10^47 erg/s or M_i(z=2) = -29.74 mag, we estimate an Eddington ratio of ~1.4. As the most luminous quasar known over the last ~9 Gyr of cosmic history, having a luminosity 8 times greater than 3C 273, the source offers a range of potential follow-up opportunities.

Comments:Subjects:Astrophysics of Galaxies (astro-ph.GA)Cite as:arXiv:2206.04204 [arxiv.org] [astro-ph.GA] (or arXiv:2206.04204v1 [arxiv.org] [astro-ph.GA] for this version) https://doi.org/10.48550/arXiv.2206.04204 [doi.org]

Journal Reference:
Onken, Christopher A., Lai, Samuel, Wolf, Christian, et al. Discovery of the most luminous quasar of the last 9 Gyr, (DOI: 10.48550/arXiv.2206.04204 [doi.org])

Original Submission