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

被引：166

作者：

Matsuoka, Yoshiki ^{[1
,2
,3
]}

Onoue, Masafusa ^{[2
]}

Kashikawa, Nobunari ^{[1
,2
]}

Iwasawa, Kazushi ^{[4
,5
]}

Strauss, Michael A. ^{[3
]}

Nagao, Tohru ^{[6
]}

Imanishi, Masatoshi ^{[1
,2
,7
]}

Niida, Mana ^{[8
]}

Toba, Yoshiki ^{[6
]}

Akiyama, Masayuki ^{[9
]}

Asami, Naoko

Bosch, James ^{[3
]}

Foucaud, Sebastien ^{[10
]}

Furusawa, Hisanori ^{[1
]}

Goto, Tomotsugu ^{[11
,12
]}

Gunn, James E.

Harikane, Yuichi ^{[13
,14
]}

Ikeda, Hiroyuki ^{[1
]}

Kawaguchi, Toshihiro ^{[15
]}

Kikuta, Satoshi ^{[2
]}

Komiyama, Yutaka ^{[1
,2
]}

Lupton, Robert H. ^{[3
]}

Minezaki, Takeo

Miyazaki, Satoshi

Morokuma, Tomoki ^{[16
]}

Murayama, Hitoshi ^{[17
]}

Nishizawa, Atsushi J. ^{[18
]}

Ono, Yoshiaki

Ouchi, Masami

Price, Paul A.

Sameshima, Hiroaki ^{[19
]}

Silverman, John D.

Sugiyama, Naoshi ^{[20
]}

Tait, Philip J.

Takada, Masahiro

Takata, Tadafumi ^{[1
,2
]}

Tanaka, Masayuki ^{[1
,2
]}

Tang, Ji-Jia ^{[21
]}

Utsumi, Yousuke ^{[22
,23
]}

机构：

[1] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[2] Grad Univ Adv Studies, Sch Sci, Dept Astron, Mitaka, Tokyo 1818588, Japan

[3] Princeton Univ Observ, Peyton Hall, Princeton, NJ 08544 USA

[4] Univ Barcelona, IEEC, ICREA, Marti & Franques 1, E-08028 Barcelona, Spain

[5] Univ Barcelona, Inst Ciencies Cosmos, Marti & Franques 1, E-08028 Barcelona, Spain

[6] Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan

[7] Subaru Telescope, Hilo, HI 96720 USA

[8] Ehime Univ, Grad Sch Sci & Engn, Matsuyama, Ehime 7908577, Japan

[9] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi, Japan

[10] Japan Profess Sch Educ, Chiyoda Ku, Tokyo 1010041, Japan

[11] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

[12] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan

[13] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[14] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[15] Univ Tokyo, Grad Sch Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[16] Sapporo Med Univ, Dept Liberal Arts & Sci, Chuo Ku, Sapporo, Hokkaido 0608556, Japan

[17] Univ Tokyo, Inst Astron, Mitaka, Tokyo 1810015, Japan

[18] Univ Tokyo, WPI, Kavli Inst Phys & Math Universe, Kashiwa, Chiba 2778583, Japan

[19] Nagoya Univ, Inst Adv Res, Furo Cho, Nagoya, Aichi 4648602, Japan

[20] Kyoto Sangyo Univ, Koyama Astron Observ, Kita Ku, Kyoto 6038555, Japan

[21] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648602, Japan

[22] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan

[23] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Higashihiroshima, Hiroshima 7398526, Japan

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 828卷 / 01期

基金：

美国国家航空航天局; 日本科学技术振兴机构; 美国国家科学基金会; 日本学术振兴会;

关键词：

dark ages; reionization; first stars; galaxies: active; galaxies: high-redshift; intergalactic medium; quasars: general; quasars: supermassive black holes; DIGITAL SKY SURVEY; SIMILAR-TO; 6; LY-ALPHA EMITTERS; MASSIVE BLACK-HOLES; ULTRA-DEEP-FIELD; ACTIVE GALACTIC NUCLEI; STAR-FORMING GALAXIES; LYMAN BREAK GALAXIES; 10(8) SOLAR MASS; COSMIC REIONIZATION;

D O I：

10.3847/0004-637X/828/1/26

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We 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.

引用

页数：14

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

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