ALMA deep field in SSA22: Survey design and source catalog of a 20 arcmin2 survey at 1.1 mm

PASJ: Publications of the Astronomical Society of Japan

Ivison, Rob J¹  Matsuda, Yuichi¹  Hayatsu, Natsuki H²  Tamura, Yoichi³  Kohno, Kotaro⁴  Smail, Ian⁵  Alexander, David M⁵  Kubo, Mariko⁵  Kato, Yuta⁶  Umehata, Hideki⁷  Ikarashi, Soh⁸  Hatsukade, Bunyo⁹ 

[1] Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK;Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan;European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany;Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK;Institute of Astronomy, School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;The Open University of Japan, 2-11 Wakaba, Mihama-ku, Chiba, Chiba 261-8586, Japan

关键词: galaxies: formation;    galaxies: high-redshift;    galaxies: ISM;    galaxies: starburst;    submillimeter: galaxies;   

DOI  :  10.1093/pasj/psy065

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

To search for dust-obscured star-formation activity in the early Universe, it is essential to obtain a deep and wide submillimeter/millimeter map. The advent of the Atacama Large Millimeter/submillimeter Array (ALMA) has enabled us to obtain such maps with sufficiently high spatial resolution to be free from source confusion. We present a new 1.1 mm-wave map obtained by ALMA in the SSA22 field. The field contains a remarkable proto-cluster at z = 3.09; therefore, it is an ideal region to investigate the role of a large-scale cosmic web on dust-obscured star formation. The typical 1σ depth of our map is 73 μJy beam−1 with a |${0^{^{\prime\prime}_{.}}5}$| resolution. Combining the present survey with earlier, archived observations, we map an area of 20 arcmin2 (71 comoving Mpc2 at z = 3.09). Within the combined survey area we have detected 35 sources at a signal-to-noise ratio (S/N) >5, with flux densities of S1.1mm = 0.43–5.6 mJy, equivalent to star-formation rates of ≳100–1000 M⊙ yr−1 at z = 3.09, for a Chabrier initial mass function: 17 sources out of 35 are new detections. The cumulative number counts show an excess by a factor of three to five compared to blank fields. The excess suggests enhanced, dust-enshrouded star-formation activity in the proto-cluster on a 10 comoving Mpc scale, indicating accelerated galaxy evolution in this overdense region.

【 授权许可】

CC BY