Abstract
Abstract We report the discovery of a quasar at z = 7.07, which was selected from the deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. This quasar, HSC J124353.93+010038.5, has an order of magnitude lower luminosity than do the other known quasars at z > 7. The rest-frame ultraviolet absolute magnitude is M 1450 = −24.13 ± 0.08 mag and the bolometric luminosity is erg s−1. Its spectrum in the optical to near-infrared shows strong emission lines, and shows evidence for a fast gas outflow, as the C iv line is blueshifted and there is indication of broad absorption lines. The Mg ii-based black hole mass is , thus indicating a moderate mass accretion rate with an Eddington ratio . It is the first z > 7 quasar with sub-Eddington accretion, besides being the third most distant quasar known to date. The luminosity and black hole mass are comparable to, or even lower than, those measured for the majority of low-z quasars discovered by the Sloan Digital Sky Survey, and thus this quasar likely represents a z > 7 counterpart to quasars commonly observed in the low-z universe.
Highlights
We found that the rest-frame equivalent widths (REWs) of the emission lines listed in Table 2 are comparable to those of low-z counterparts
This Letter is the seventh in a series of publications presenting the results from the SHELLQs project, a search for low-luminosity quasars at z 6 based on the deep multiband imaging data produced by the Hyper Suprime-Cam (HSC)-Subaru Strategic Program (SSP) survey
We presented the discovery of J1243+0100, a quasar at z = 7.07
Summary
Quasars residing in the first billion years of the universe (z > 5.7) have been used as various types of probes into early. Loeb 2019), due to the detection limits of the imaging survey observations These quasars harbor SMBHs with masses of roughly a billion solar masses, shining at close to the Eddington luminosity (the black hole mass of one of the quasars at z = 7.02 has not been measured; Yang et al.2018). They likely represent the most extreme monsters, which are very rare at all redshifts, especially at z > 7. All magnitudes refer to point-spread function (PSF) magnitudes in the AB system (Oke & Gunn 1983), and are corrected for Galactic extinction (Schlegel et al 1998)
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