Spatial correlation between submillimetre and Lyman-α galaxies in the SSA 22 protocluster

Yoichi Tamura (), Kotaro Kohno, Kouichiro Nakanishi, Bunyo Hatsukade, Daisuke Iono, Grant W. Wilson, Min S. Yun, Tadafumi Takata, Yuichi Matsuda, Tomoka Tosaki, Hajime Ezawa, Thushara A. Perera, Kimberly S. Scott, Jason E. Austermann, David H. Hughes, Itziar Aretxaga, Aeree Chung, Tai Oshima, Nobuyuki Yamaguchi, Kunihiko Tanaka and Ryohei Kawabe
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Yoichi Tamura: University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Kotaro Kohno: Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Kouichiro Nakanishi: National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Bunyo Hatsukade: Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Daisuke Iono: Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Grant W. Wilson: University of Massachusetts, Amherst, Massachusetts 01003, USA
Min S. Yun: University of Massachusetts, Amherst, Massachusetts 01003, USA
Tadafumi Takata: National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Yuichi Matsuda: National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Tomoka Tosaki: Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Hajime Ezawa: Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Thushara A. Perera: University of Massachusetts, Amherst, Massachusetts 01003, USA
Kimberly S. Scott: University of Massachusetts, Amherst, Massachusetts 01003, USA
Jason E. Austermann: University of Massachusetts, Amherst, Massachusetts 01003, USA
David H. Hughes: Instituto Nacional de Astrofísica, Optica y Electrónica, Aptdo. Postal 51 y 216, 72000 Puebla, Puebla, Mexico
Itziar Aretxaga: Instituto Nacional de Astrofísica, Optica y Electrónica, Aptdo. Postal 51 y 216, 72000 Puebla, Puebla, Mexico
Aeree Chung: University of Massachusetts, Amherst, Massachusetts 01003, USA
Tai Oshima: Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Nobuyuki Yamaguchi: Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Kunihiko Tanaka: Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Ryohei Kawabe: Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305, Japan

Nature, 2009, vol. 459, issue 7243, 61-63

Abstract: Star formation: Lyman-α emitters in the SSA 22 protocluster Many different populations of young star-forming galaxies in the early Universe are known, but the relationships between them and the cosmic large-scale structure are still not well understood. One group, the Lyman-α emitters, are thought to be young, low-mass galaxies with ages of around 108 years. An overdensity of them in one region of the sky is believed to mark a forming protocluster. Galaxies that are bright at submillimetre wavelengths are undergoing violent episodes of star formation, so the question of whether they are also associated with the protocluster naturally arises. Tamura et al. report an enhancement of submillimetre galaxies near the core of the SSA 22 protocluster, and a large-scale correlation between the submillimetre galaxies and the low-mass Lyman-α emitters, suggesting synchronous formation of the two very different types of star-forming galaxies within the same structure at high redshift.

Date: 2009
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DOI: 10.1038/nature07947

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