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Title: 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 <sup>2</sup> sky
Authors: Yoshiaki Ono
Masami Ouchi
Yuichi Harikane
Jun Toshikawa
Michael Rauch
Suraphong Yuma
Marcin Sawicki
Takatoshi Shibuya
Kazuhiro Shimasaku
Masamune Oguri
Chris Willott
Mohammad Akhlaghi
Masayuki Akiyama
Jean Coupon
Nobunari Kashikawa
Yutaka Komiyama
Akira Konno
Lihwai Lin
Yoshiki Matsuoka
Satoshi Miyazaki
Tohru Nagao
Kimihiko Nakajima
John Silverman
Masayuki Tanaka
Yoshiaki Taniguchi
Shiang Yu Wang
Research Center for the Early Universe
Academia Sinica, Institute of Astronomy and Astrophysics
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
University of Tokyo
European Southern Observatory
Université Claude Bernard Lyon 1
The Graduate University for Advanced Studies
Saint Mary's University
The Open University of Japan
Mahidol University
National Research Council Canada
Tohoku University
Université de Genève
Carnegie Observatories
Ehime University
Keywords: Earth and Planetary Sciences;Physics and Astronomy
Issue Date: 1-Jan-2018
Citation: Publications of the Astronomical Society of Japan. Vol.70, (2018)
Abstract: © The Author 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. We study the UV luminosity functions (LFs) at z ∼ 4, 5, 6, and 7 based on the deep largearea optical images taken by the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP). On the 100 deg2 sky of the HSC SSP data available to date, we take enormous samples consisting of a total of 579565 dropout candidates at z ∼ 4-7 by the standard color selection technique, 358 out of which are spectroscopically confirmed by our followup spectroscopy and other studies. We obtain UV LFs at z ∼ 4-7 that span a very wide UV luminosity range of ∼0.002-100 L∗ UV (-26 < MUV < -14 mag) by combining LFs from our program and the ultra-deep Hubble Space Telescope legacy surveys.We derive three parameters of the best-fit Schechter function, φ∗, M∗ UV, and α, of the UV LFs in the magnitude range where the active galactic nucleus (AGN) contribution is negligible, and find that α and φ∗ decrease from z ∼ 4 to 7 with no significant evolution of M∗ UV . Because our HSC SSP data bridge the LFs of galaxies and AGNs with great statistical accuracy, we carefully investigate the bright end of the galaxy UV LFs that are estimated by the subtraction of the AGN contribution either aided by spectroscopy or the best-fit AGN UV LFs.We find that the bright end of the galaxy UV LFs cannot be explained by the Schechter function fits at>2 σ significance, and require either double power-law functions or modified Schechter functions that consider a magnification bias due to gravitational lensing.
ISSN: 2053051X
Appears in Collections:Scopus 2018

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