Abstract
We report the discovery of an ultra-luminous quasar J030642.51+185315.8
(hereafter J0306+1853) at redshift 5.363, which hosts a super-massive black
hole (SMBH) with $M_BH = (1.07 0.27) \times10^10~M_ødot$. With an
absolute magnitude $M_1450=-28.92$ and bolometric luminosity
$L_bol\sim3.4\times10^14 L_ødot$, J0306+1853 is one of the most luminous
objects in the early Universe. It is not likely to be a beamed source based on
its small flux variability, low radio loudness and normal broad emission lines.
In addition, a $z=4.986$ Damped Ly$\alpha$ system (DLA) with $\rm
M/H=-1.3\pm0.1$, among the most metal rich DLAs at $z 5$, is detected
in the absorption spectrum of this quasar. This ultra-luminous quasar puts
strong constraint on the bright-end of quasar luminosity function and
massive-end of black hole mass function. It will provide a unique laboratory to
the study of BH growth and the co-evolution between BH and host galaxy with
multi-wavelength follow-up observations. The future high resolution spectra
will give more insights to the DLA and other absorption systems along the
line-of-sight of J0306+1853.
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