%0 Generic %1 ono2017great %A Ono, Yoshiaki %A Ouchi, Masami %A Harikane, Yuichi %A Toshikawa, Jun %A Rauch, Michael %A Yuma, Suraphong %A Sawicki, Marcin %A Shibuya, Takatoshi %A Shimasaku, Kazuhiro %A Oguri, Masamune %A Willott, Chris %A Akhlaghi, Mohammad %A Akiyama, Masayuki %A Coupon, Jean %A Kashikawa, Nobunari %A Komiyama, Yutaka %A Konno, Akira %A Lin, Lihwai %A Matsuoka, Yoshiki %A Miyazaki, Satoshi %A Nagao, Tohru %A Nakajima, Kimihiko %A Silverman, John %A Tanaka, Masayuki %A Wang, Shiang-Yu %D 2017 %K HSC SSP UV function luminosity %T Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z 4-7$ Derived with the Half-Million Dropouts on the 100 deg$^2$ Sky %U http://arxiv.org/abs/1704.06004 %X We study the UV luminosity functions (LFs) at $z4$, $5$, $6,$ and $7$ based on the deep large-area optical images taken by the Hyper Suprime-Cam (HSC) Subaru strategic program (SSP). On the 100 deg$^2$ sky of the HSC SSP data available to date, we make enormous samples consisting of a total of 579,555 dropout candidates at $z4-7$ by the standard color selection technique, 348 out of which are spectroscopically confirmed by our follow-up spectroscopy and the other studies. We obtain the UV LFs at $z 4-7$ that span a very wide UV luminosity range of $0.002 - 100 \, L_UV^\ast$ ($-26 < M_UV < -14$ mag), combining UV LFs of our program and the ultra-deep Hubble Space Telescope legacy surveys. We derive three parameters of the best-fit Schechter function, $\phi^\ast$, $M_UV^\ast$, and $\alpha$, of the UV LFs in the magnitude range where the AGN contribution is negligible, and find that $\alpha$ and $\phi^\ast$ decrease from $z4$ to $7$ with no significant evolution of $M_UV^\ast$. Because our HSC SSP data bridge the LFs of galaxies and AGNs with great statistical accuracies, we carefully investigate the bright ends of the galaxy UV LFs that are estimated by the subtraction of the AGN contribution either with the spectroscopy results or the best-fit AGN UV LFs. We find that the bright ends of the galaxy UV LFs cannot be explained by the Schechter function fits at $> 2 \sigma$ significance, and require either double power-law functions or modified Schechter functions considering the gravitational lensing magnification bias.

@misc{ono2017great, abstract = {We study the UV luminosity functions (LFs) at $z\sim 4$, $5$, $6,$ and $7$ based on the deep large-area optical images taken by the Hyper Suprime-Cam (HSC) Subaru strategic program (SSP). On the 100 deg$^2$ sky of the HSC SSP data available to date, we make enormous samples consisting of a total of 579,555 dropout candidates at $z\sim 4-7$ by the standard color selection technique, 348 out of which are spectroscopically confirmed by our follow-up spectroscopy and the other studies. We obtain the UV LFs at $z \sim 4-7$ that span a very wide UV luminosity range of $\sim 0.002 - 100 \, L_{\rm UV}^\ast$ ($-26 < M_{\rm UV} < -14$ mag), combining UV LFs of our program and the ultra-deep Hubble Space Telescope legacy surveys. We derive three parameters of the best-fit Schechter function, $\phi^\ast$, $M_{\rm UV}^\ast$, and $\alpha$, of the UV LFs in the magnitude range where the AGN contribution is negligible, and find that $\alpha$ and $\phi^\ast$ decrease from $z\sim 4$ to $7$ with no significant evolution of $M_{\rm UV}^\ast$. Because our HSC SSP data bridge the LFs of galaxies and AGNs with great statistical accuracies, we carefully investigate the bright ends of the galaxy UV LFs that are estimated by the subtraction of the AGN contribution either with the spectroscopy results or the best-fit AGN UV LFs. We find that the bright ends of the galaxy UV LFs cannot be explained by the Schechter function fits at $> 2 \sigma$ significance, and require either double power-law functions or modified Schechter functions considering the gravitational lensing magnification bias.}, added-at = {2017-04-21T10:31:37.000+0200}, author = {Ono, Yoshiaki and Ouchi, Masami and Harikane, Yuichi and Toshikawa, Jun and Rauch, Michael and Yuma, Suraphong and Sawicki, Marcin and Shibuya, Takatoshi and Shimasaku, Kazuhiro and Oguri, Masamune and Willott, Chris and Akhlaghi, Mohammad and Akiyama, Masayuki and Coupon, Jean and Kashikawa, Nobunari and Komiyama, Yutaka and Konno, Akira and Lin, Lihwai and Matsuoka, Yoshiki and Miyazaki, Satoshi and Nagao, Tohru and Nakajima, Kimihiko and Silverman, John and Tanaka, Masayuki and Wang, Shiang-Yu}, biburl = {https://www.bibsonomy.org/bibtex/2c11672f2c943b3f4ea9f660b422893a6/miki}, description = {[1704.06004] Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z \sim 4-7$ Derived with the Half-Million Dropouts on the 100 deg$^2$ Sky}, interhash = {91df59f85580824394f62ea804f010a6}, intrahash = {c11672f2c943b3f4ea9f660b422893a6}, keywords = {HSC SSP UV function luminosity}, note = {cite arxiv:1704.06004Comment: 28 pages, 11 figures, submitted to a special issue of PASJ}, timestamp = {2017-04-21T10:31:37.000+0200}, title = {Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV Luminosity Functions at $z \sim 4-7$ Derived with the Half-Million Dropouts on the 100 deg$^2$ Sky}, url = {http://arxiv.org/abs/1704.06004}, year = 2017 }