Attribution-NonCommercial-ShareAlike 4.0 InternationalOnken, Christopher A.Lai, SamuelWolf, ChristianLucy, Adrian B.Hon,Wei JeatTisserand, PatrickSokolosk, Jennifer L.Luna, Gerardo J. M.Manick, RajeevFan, XiaohuiBian, FuyanPérez, Mariana ValeriaLuna, Gerardo Juan Manuel2024-01-262024-01-262021Onken, C.A. et al. (2022) Discovery of the most luminous quasar of the last 9 Gyr. PASA. Astronomical Society of Australia, 39, 37-47. doi:10.1017/pasa.2022.361448-6083https://doi.org/10.1017/pasa.2022.36 Phttp://dx.doi.org/10.1017/pasa.2022.36https://repositorio.unahur.edu.ar/handle/123456789/97https://www.cambridge.org/core/product/identifier/S1323358022000364/type/journal_articlehttps://arxiv.org/abs/2206.04204We 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◦, 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, Hβ, Hα, and Paβ emission lines, from which we measure a black hole mass of log10(MBH/M) = 9.4 ± 0.5. With its high luminosity, Lbol = (4.7 ± 1.0) × 1047 erg s−1 or Mi(z = 2) = −29.74 mag (AB), 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× greater than 3C 273, the source offers a range of potential follow-up opportunities.application/pdfenginfo:eu-repo/semantics/openAccessNúcleo galácticosAgujeros negrosCuasaresinfo:eu-repo/semantics/article