A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1

PASJ: Publications of the Astronomical Society of Japan

Shibuya, Takatoshi¹  Miyazaki, Satoshi²  Ouchi, Masami³  Nishizawa, Atsushi J⁴  Yabe, Kiyoto⁴  Lin, Yen-Ting⁴  Kodama, Tadayuki⁴  Koyama, Yusei⁵  Komiyama, Yutaka⁶  Tadaki, Ken-ichi⁷  Hayashi, Masao⁷  Tanaka, Masayuki⁷  Shimakawa, Rhythm⁷  Momose, Rieko⁷  Nagao, Tohru⁷  Leauthaud, Alexie⁷  Silverman, John D⁸  Furusawa, Hisanori⁹ 

[1] Academia Sinica Institute of Astronomy and Astrophysics, PO Box 23-141, Taipei 10617, Taiwan;Astronomical Institute, Tohoku University, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan;Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA;Department of Astronomy, School of Science, Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Institute of Astronomy, National Tsing Hua University, 101, Section 2 Kuang-Fu Road, Hsinchu, Taiwan, 30013, ROC;Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Subaru Telescope, National Astronomical Observatory of Japan, 650 N’Aohoku Pl, Hilo, HI 96720, USA;UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA

关键词: galaxies: evolution;    galaxies: high-redshift;    galaxies: luminosity function, mass function;    (cosmology:) large-scale structure of universe;   

DOI  :  10.1093/pasj/psx088

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We present initial results from the Subaru Strategic Program (SSP) with Hyper Suprime-Cam (HSC) on a comprehensive survey of emission-line galaxies at z < 1.5 based on narrowband imaging. The first Public Data Release provides us with data from two narrowband filters, specifically NB816 and NB921 over 5.7 deg2 and 16.2 deg2 respectively. The 5 σ limiting magnitudes are 25.2 mag (UltraDeep layer, 1.4 deg2) and 24.8 mag (Deep layer, 4.3 deg2) for NB816, and 25.1 mag (UltraDeep, 2.9 deg2) and 24.6–24.8 mag (Deep, 13.3 deg2) for NB921. The wide-field imaging allows us to construct unprecedentedly large samples of 8054 H α emitters at z ≈ 0.25 and 0.40, 8656 [O iii] emitters at z ≈ 0.63 and 0.84, and 16877 [O ii] emitters at z ≈ 1.19 and 1.47. We map the cosmic web on scales out to about 50 comoving Mpc that includes galaxy clusters, identified by red sequence galaxies, located at the intersection of filamentary structures of star-forming galaxies. The luminosity functions of emission-line galaxies are measured with precision and are consistent with published studies. The wide field coverage of the data enables us to measure the luminosity functions up to brighter luminosities than previous studies. The comparison of the luminosity functions between the different HSC-SSP fields suggests that a survey volume of >5 × 105 Mpc3 is essential to overcome cosmic variance. Since the current data have not reached the full depth expected for the HSC-SSP, the color cut in i − NB816 or z − NB921 induces a bias towards star-forming galaxies with large equivalent widths, primarily seen in the stellar mass functions for the H α emitters at z ≈ 0.25–0.40. Even so, the emission-line galaxies clearly cover a wide range of luminosity, stellar mass, and environment, thus demonstrating the usefulness of the narrowband data from the HSC-SSP for investigating star-forming galaxies at z < 1.5.

【 授权许可】

CC BY