Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
Volume 35, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/pasa.2018.22
Keywords
galaxies: active; galaxies: high-redshift; quasars: general
Categories
Funding
- Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]
- ARC LIEF grant from the Australian Research Council [LE130100104]
- Australian National University
- Swinburne University of Technology
- University of Queensland
- University of Western Australia
- University of Melbourne
- Curtin University of Technology
- Monash University
- Australian Astronomical Observatory
- Astronomy Australia Limited (AAL)
- Australian Government through the Commonwealth's Education Investment Fund (EIF)
- National Collaborative Research Infrastructure Strategy (NCRIS)
- National eResearch Collaboration Tools and Resources (NeCTAR)
- Australian National Data Service Projects (ANDS)
- National Aeronautics and Space Administration
- National Science Foundation
- VISTA Hemisphere Survey ESO [179.A-2010]
- NASA [NN12AR55G]
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We report the discovery of the ultra-luminous quasi-stellar object SMSS J215728.21-360215.1 with magnitude z = 16.9 and W4 = 7.42 at redshift 4.75. Given absolute magnitudes of M-145,M-AB = -29.3, M-300,M-AB = -30.12, and logL(bol)/L-bol,(circle dot) = 14.84, it is the quasi-stellar object with the highest unlensed UV-optical luminosity currently known in the Universe. It was found by combining proper-motion data from Gaia DR2 with photometry from SkyMapper DR1 and the Wide-field Infrared Survey Explorer. In the GAIA database, it is an isolated single source and thus unlikely to be strongly gravitationally lensed. It is also unlikely to be a beamed source as it is not discovered in the radio domain by either NRAO-VLA Sky Survey or Sydney University Molonglo Southern Survey. It is classed as a weak-emission-line quasi-stellar object and possesses broad absorption line features. A lightcurve from ATLAS spanning the time from 2015 October to 2017 December shows little sign of variability.
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