%0 Generic %1 matsuoka2016subaru %A Matsuoka, Yoshiki %A Onoue, Masafusa %A Kashikawa, Nobunari %A Iwasawa, Kazushi %A Strauss, Michael A. %A Nagao, Tohru %A Imanishi, Masatoshi %A Niida, Mana %A Toba, Yoshiki %A Akiyama, Masayuki %A Asami, Naoko %A Bosch, James %A Foucaud, Sébastien %A Furusawa, Hisanori %A Goto, Tomotsugu %A Gunn, James E. %A Harikane, Yuichi %A Ikeda, Hiroyuki %A Kawaguchi, Toshihiro %A Kikuta, Satoshi %A Komiyama, Yutaka %A Lupton, Robert H. %A Minezaki, Takeo %A Miyazaki, Satoshi %A Morokuma, Tomoki %A Murayama, Hitoshi %A Nishizawa, Atsushi J. %A Ono, Yoshiaki %A Ouchi, Masami %A Price, Paul A. %A Sameshima, Hiroaki %A Silverman, John D. %A Sugiyama, Naoshi %A Tait, Philip J. %A Takada, Masahiro %A Takata, Tadafumi %A Tanaka, Masayuki %A Tang, Ji-Jia %A Utsumi, Yousuke %D 2016 %K low lumininosity qso z~5 %T Subaru high-$z$ exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at $5.7 < z < 6.9$ %U http://arxiv.org/abs/1603.02281 %X 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 (SHELLQs) project, which exploits the exquisite multi-band 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 $z \ge 6$ galaxies, compared to that of quasars, at magnitudes fainter than $M_\rm 1450 -22$ mag or $z_AB 24$ mag. Follow-up studies of the discovered objects as well as further survey observations are ongoing.

@misc{matsuoka2016subaru, abstract = {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 (SHELLQs) project, which exploits the exquisite multi-band 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 ($z_{\rm AB} < 23.5$ 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 $z \ge 6$ galaxies, compared to that of quasars, at magnitudes fainter than $M_{\rm 1450} \sim -22$ mag or $z_{\rm AB} \sim 24$ mag. Follow-up studies of the discovered objects as well as further survey observations are ongoing.}, added-at = {2016-03-09T09:43:30.000+0100}, author = {Matsuoka, Yoshiki and Onoue, Masafusa and Kashikawa, Nobunari and Iwasawa, Kazushi and Strauss, Michael A. and Nagao, Tohru and Imanishi, Masatoshi and Niida, Mana and Toba, Yoshiki and Akiyama, Masayuki and Asami, Naoko and Bosch, James and Foucaud, Sébastien and Furusawa, Hisanori and Goto, Tomotsugu and Gunn, James E. and Harikane, Yuichi and Ikeda, Hiroyuki and Kawaguchi, Toshihiro and Kikuta, Satoshi and Komiyama, Yutaka and Lupton, Robert H. and Minezaki, Takeo and Miyazaki, Satoshi and Morokuma, Tomoki and Murayama, Hitoshi and Nishizawa, Atsushi J. and Ono, Yoshiaki and Ouchi, Masami and Price, Paul A. and Sameshima, Hiroaki and Silverman, John D. and Sugiyama, Naoshi and Tait, Philip J. and Takada, Masahiro and Takata, Tadafumi and Tanaka, Masayuki and Tang, Ji-Jia and Utsumi, Yousuke}, biburl = {https://www.bibsonomy.org/bibtex/203c1ba2ee073b73a9e20f7af8f096e09/miki}, description = {[1603.02281] Subaru high-$z$ exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at $5.7 &lt; z &lt; 6.9$}, interhash = {32dd6eb28ccace6a4aef50980ad9c720}, intrahash = {03c1ba2ee073b73a9e20f7af8f096e09}, keywords = {low lumininosity qso z~5}, note = {cite arxiv:1603.02281Comment: Submitted to ApJ}, timestamp = {2016-03-09T09:43:44.000+0100}, title = {Subaru high-$z$ exploration of low-luminosity quasars (SHELLQs). I. Discovery of 15 quasars and bright galaxies at $5.7 < z < 6.9$}, url = {http://arxiv.org/abs/1603.02281}, year = 2016 }