новелла - Discovery of the most ultra-luminous QSO

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новелла - Discovery of the most ultra-luminous QSO using Gaia, SkyMapper and WISE  https://arxiv.org/pdf/1805.04317.pdf
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Abstract
We report the discovery of the ultra-luminous QSO SMSS J215728.21-360215.1 with magnitude z = 16.9
and W4= 7.42 at redshift 4.75. Given absolute magnitudes of M145,AB = ;29.3, M300,AB = ;30.12 and
log Lbol/Lbol, = 14.84, it is the QSO 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 (WISE). 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 NVSS or SUMSS. It is classed
as a weak-emission-line QSO and possesses broad absorption line features. A lightcurve from ATLAS
spanning the time from October 2015 to December 2017 shows little sign of variability