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SUBARU HIGH-z EXPLORATION OF LOW-LUMINOSITY QUASARS (SHELLQs). I. DISCOVERY OF 15 QUASARS AND BRIGHT GALAXIES AT 5.7 < z < 6.9

Author(s): Matsuoka, Yoshiki; Onoue, Masafusa; Kashikawa, Nobunari; Iwasawa, Kazushi; Strauss, Michael A; et al

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dc.contributor.authorMatsuoka, Yoshiki-
dc.contributor.authorOnoue, Masafusa-
dc.contributor.authorKashikawa, Nobunari-
dc.contributor.authorIwasawa, Kazushi-
dc.contributor.authorStrauss, Michael A-
dc.contributor.authorNagao, Tohru-
dc.contributor.authorImanishi, Masatoshi-
dc.contributor.authorNiida, Mana-
dc.contributor.authorToba, Yoshiki-
dc.contributor.authorAkiyama, Masayuki-
dc.contributor.authorAsami, Naoko-
dc.contributor.authorBosch, James-
dc.contributor.authorFoucaud, Sebastien-
dc.contributor.authorFurusawa, Hisanori-
dc.contributor.authorGoto, Tomotsugu-
dc.contributor.authorGunn, James E-
dc.contributor.authorHarikane, Yuichi-
dc.contributor.authorIkeda, Hiroyuki-
dc.contributor.authorKawaguchi, Toshihiro-
dc.contributor.authorKikuta, Satoshi-
dc.contributor.authorKomiyama, Yutaka-
dc.contributor.authorLupton, Robert H-
dc.contributor.authorMinezaki, Takeo-
dc.contributor.authorMiyazaki, Satoshi-
dc.contributor.authorMorokuma, Tomoki-
dc.contributor.authorMurayama, Hitoshi-
dc.contributor.authorNishizawa, Atsushi J-
dc.contributor.authorOno, Yoshiaki-
dc.contributor.authorOuchi, Masami-
dc.contributor.authorPrice, Paul A-
dc.contributor.authorSameshima, Hiroaki-
dc.contributor.authorSilverman, John D-
dc.contributor.authorSugiyama, Naoshi-
dc.contributor.authorTait, Philip J-
dc.contributor.authorTakada, Masahiro-
dc.contributor.authorTakata, Tadafumi-
dc.contributor.authorTanaka, Masayuki-
dc.contributor.authorTang, Ji-Jia-
dc.contributor.authorUtsumi, Yousuke-
dc.date.accessioned2022-01-25T14:57:59Z-
dc.date.available2022-01-25T14:57:59Z-
dc.date.issued2016-09-01en_US
dc.identifier.citationMatsuoka, Yoshiki, Onoue, Masafusa, Kashikawa, Nobunari, Iwasawa, Kazushi, Strauss, Michael A, Nagao, Tohru, Imanishi, Masatoshi, Niida, Mana, Toba, Yoshiki, Akiyama, Masayuki, Asami, Naoko, Bosch, James, Foucaud, Sebastien, Furusawa, Hisanori, Goto, Tomotsugu, Gunn, James E, Harikane, Yuichi, Ikeda, Hiroyuki, Kawaguchi, Toshihiro, Kikuta, Satoshi, Komiyama, Yutaka, Lupton, Robert H, Minezaki, Takeo, Miyazaki, Satoshi, Morokuma, Tomoki, Murayama, Hitoshi, Nishizawa, Atsushi J, Ono, Yoshiaki, Ouchi, Masami, Price, Paul A, Sameshima, Hiroaki, Silverman, John D, Sugiyama, Naoshi, Tait, Philip J, Takada, Masahiro, Takata, Tadafumi, Tanaka, Masayuki, Tang, Ji-Jia, Utsumi, Yousuke. (2016). SUBARU HIGH-z EXPLORATION OF LOW-LUMINOSITY QUASARS (SHELLQs). I. DISCOVERY OF 15 QUASARS AND BRIGHT GALAXIES AT 5.7 < z < 6.9. ASTROPHYSICAL JOURNAL, 828 (10.3847/0004-637X/828/1/26en_US
dc.identifier.issn0004-637X-
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1fb4wk74-
dc.description.abstractWe report the discovery of 15 quasars and bright galaxies at 5.7 < z < 6.9. This is the initial result from the Subaru High-z Exploration of Low-Luminosity Quasars project, which exploits the exquisite multiband imaging data produced by the Subaru Hyper Suprime-Cam (HSC) Strategic Program survey. The candidate selection is performed by combining several photometric approaches including a Bayesian probabilistic algorithm to reject stars and dwarfs. The spectroscopic identification was carried out with the Gran Telescopio Canarias and the Subaru Telescope for the first 80 deg(2) of the survey footprint. The success rate of our photometric selection is quite high, approaching 100% at the brighter magnitudes (z(AB) < 23.5 mag). Our selection also recovered all the known high-z quasars on the HSC images. Among the 15 discovered objects, six are likely quasars, while the other six with interstellar absorption lines and in some cases narrow emission lines are likely bright Lyman-break galaxies. The remaining three objects have weak continua and very strong and narrow Ly alpha lines, which may be excited by ultraviolet light from both young stars and quasars. These results indicate that we are starting to see the steep rise of the luminosity function of z >= 6 galaxies, compared with that of quasars, at magnitudes fainter than M-1450 similar to -22 mag or z(AB) similar to 24 mag. Follow-up studies of the discovered objects as well as further survey observations are ongoing.en_US
dc.language.isoen_USen_US
dc.relationhttps://ui.adsabs.harvard.edu/abs/2016ApJ...828...26M/abstracten_US
dc.relation.ispartofASTROPHYSICAL JOURNALen_US
dc.rightsFinal published version. Article is made available in OAR by the publisher's permission or policy.en_US
dc.titleSUBARU HIGH-z EXPLORATION OF LOW-LUMINOSITY QUASARS (SHELLQs). I. DISCOVERY OF 15 QUASARS AND BRIGHT GALAXIES AT 5.7 < z < 6.9en_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.3847/0004-637X/828/1/26-
dc.identifier.eissn1538-4357-
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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