Infrared luminosity functions based on 18 mid-infrared bands: revealing cosmic star formation history with AKARI and Hyper Suprime-Cam

PASJ: Publications of the Astronomical Society of Japan

Jeong, Woong-Seob¹  Ohyama, Youichi²  Takagi, Toshinobu²  Nakagawa, Takao³  Matsuhara, Hideo⁴  Kim, Helen⁵  Miyaji, Takamitsu⁵  Ikeda, Hiroyuki⁶  Im, Myungshin⁷  Pearson, Chris⁸  Hashimoto, Tetsuya⁸  Chiang, Chia-Ying⁹  Utsumi, Yousuke^1,10  Barrufet, Laia^1,11  Sedgwick, Chris^1,12  Kim, Seong Jin^1,13  Toba, Yoshiki^1,13  Momose, Rieko^1,13  Goto, Tomotsugu^1,13  Kilerci Eser, Ece^1,13  Malkan, Matthew^1,13  Burgarella, Denis^1,14  Buat, Veronique^1,15  Oi, Nagisa^1,16 

[1] Astronomy, FPRD, Seoul National University, Shillim-Dong, Kwanak-Gu, Seoul 151-742, Korea;Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan;Astronomy Program, Department of Physics &Department of Astronomy, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Department of Physics and Astronomy, UCLA, 475 Portola Plaza, Los Angeles, CA 90095-1547, USA;European Space Astronomy Centre, 28691 Villanueva de la Canada, Spain;Insitituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada, 22860 Mexico;Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan;Japan Space Forum, 3-2-1, Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan;Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), SLAC National Accelerator Laboratory, Stanford University, SLAC, 2575 Sand Hill Road, Menlo Park, CA 94025, USA;Korea Astronomy and Space Science Institute (KASI), 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Korea;Korea University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea;National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu 30013, Taiwan;RAL Space, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK;The Open University, Milton Keynes, MK7 6AA, UK;Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

关键词: galaxies: luminosity function, mass function;    galaxies: star formation;    galaxies: abundances;    galaxies: statistics;    infrared: galaxies;   

DOI  :  10.1093/pasj/psz009

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Much of star formation is obscured by dust. For a complete understanding of the cosmic star formation history (CSFH), infrared (IR) census is indispensable. AKARI carried out deep mid-infrared observations using its continuous nine-band filters in the North Ecliptic Pole (NEP) field (5.4 deg2). This took a significant amount of the satellite’s lifetime, ∼10% of the entire pointed observations. By combining archival Spitzer (five bands) and WISE (four bands) mid-IR photometry, we have, in total, 18-band mid-IR photometry, which is the most comprehensive photometric coverage in the mid-IR for thousands of galaxies. However, we only had shallow optical imaging (∼25.9 AB magnitude) in a small area, 1.0 deg2. As a result, thousands of AKARI’s infrared sources remained undetected in the optical. Using the new Hyper Suprime-Cam on the Subaru telescope, we obtained deep enough optical images of the entire AKARI NEP field in five broad bands (g ∼ 27.5 mag). These provided photometric redshift, and thereby IR luminosity, for the previously undetected faint AKARI IR sources. Combined with the accurate mid-IR luminosity measurement, we constructed mid-IR luminosity functions (LFs), and thereby performed a census of dust-obscured CSFH in the entire AKARI NEP field. We have measured rest-frame 8 μm and 12 μm LFs, and estimated total infrared LFs at 0.35 < |$z$| < 2.2. Our results are consistent with our previous work, but with much reduced statistical errors thanks to the large-area coverage of the new data. We have possibly witnessed the turnover of CSFH at |$z$| ∼ 2.

【 授权许可】

CC BY