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 TanakaRyohei Kawabe

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


Lyman-α emitters are thought to be young, low-mass galaxies with ages of 10 8 yr (refs 1, 2). An overdensity of them in one region of the sky (the SSA 22 field) traces out a filamentary structure in the early Universe at a redshift of z 3.1 (equivalent to 15 per cent of the age of the Universe) and is believed to mark a forming protocluster. Galaxies that are bright at (sub)millimetre wavelengths are undergoing violent episodes of star formation, and there is evidence that they are preferentially associated with high-redshift radio galaxies, so the question of whether they are also associated with the most significant large-scale structure growing at high redshift (as outlined by Lyman-α emitters) naturally arises. Here we report an imaging survey of 1,100-m emission in the SSA 22 region. We find an enhancement of submillimetre galaxies near the core of the 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 galaxy within the same structure at high redshift. These results are in general agreement with our understanding of the formation of cosmic structure.

Original languageEnglish
Pages (from-to)61-63
Number of pages3
Issue number7243
Publication statusPublished - 2009 May 7
Externally publishedYes

ASJC Scopus subject areas

  • General


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