SIMBAD references

2018ApJ...869..150M - Astrophys. J., 869, 150-150 (2018/December-3)

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). V. Quasar luminosity function and contribution to cosmic reionization at z = 6.

MATSUOKA Y., STRAUSS M.A., KASHIKAWA N., ONOUE M., IWASAWA K., TANG J.-J., LEE C.-H., IMANISHI M., NAGAO T., AKIYAMA M., ASAMI N., BOSCH J., FURUSAWA H., GOTO T., GUNN J.E., HARIKANE Y., IKEDA H., IZUMI T., KAWAGUCHI T., KATO N., KIKUTA S., KOHNO K., KOMIYAMA Y., LUPTON R.H., MINEZAKI T., MIYAZAKI S., MURAYAMA H., NIIDA M., NISHIZAWA A.J., NOBORIGUCHI A., OGURI M., ONO Y., OUCHI M., PRICE P.A., SAMESHIMA H., SCHULZE A., SHIRAKATA H., SILVERMAN J.D., SUGIYAMA N., TAIT P.J., TAKADA M., TAKATA T., TANAKA M., TOBA Y., UTSUMI Y., WANG S.-Y. and YAMASHITA T.

Abstract (from CDS):

We present new measurements of the quasar luminosity function (LF) at z ∼ 6 over an unprecedentedly wide range of the rest-frame ultraviolet luminosity M1450 from -30 to -22 mag. This is the fifth in a series of publications from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the deep multiband imaging data produced by the Hyper Suprime-Cam Subaru Strategic Program survey. The LF was calculated with a complete sample of 110 quasars at 5.7 <= z <= 6.5, which includes 48 SHELLQs quasars discovered over 650 deg2 and 63 brighter quasars discovered by the Sloan Digital Sky Survey and the Canada-France-Hawaii Quasar Survey (including one overlapping object). This is the largest sample of z ∼ 6 quasars with a well-defined selection function constructed to date, which has allowed us to detect significant flattening of the LF at its faint end. A double power-law function fit to the sample yields a faint-end slope α=-1.23–0.34+0.44, a bright-end slope β=-2.73–0.31+0.23, a break magnitude M1450* =-24.90–0.90+0.75, and a characteristic space density Φ* =10.9–6.8+10.0 Gpc–3 mag–1. Integrating this best-fit model over the range -18 < M1450 < -30 mag, quasars emit ionizing photons at the rate of {dot}nion=10^48.8±0.1^ s–1 Mpc–3 at z = 6.0. This is less than 10% of the critical rate necessary to keep the intergalactic medium ionized, which indicates that quasars are not a major contributor to cosmic reionization.

Abstract Copyright: © 2018. The American Astronomical Society.

Journal keyword(s): dark ages, reionization, first stars - galaxies: active - galaxies: high-redshift - intergalactic medium - quasars: general - quasars: supermassive black holes

Nomenclature: Table 1: [MOK2016b] HSC JHHMMSS.ss+DDMMSS.s N=110 = [MOK2016b] HSC JHHMM+DDMM.

Simbad objects: 111

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2023.01.29-14:20:22

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