AzTEC/ASTE 1.1-mm survey of SSA22: Counterpart identification and photometric redshift survey of submillimetre galaxies

H. Umehata, Y. Tamura, K. Kohno, B. Hatsukade, K. S. Scott, M. Kubo, T. Yamada, R. J. Ivison, R. Cybulski, I. Aretxaga, J. Austermann, D. H. Hughes, H. Ezawa, T. Hayashino, S. Ikarashi, D. Iono, R. Kawabe, Y. Matsuda, H. Matsuo, K. NakanishiT. Oshima, T. Perera, T. Takata, G. W. Wilson, M. S. Yun

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


We present the results from a 1.1-mm imaging survey of the SSA22 field, known for having an overdensity of z =3.1 Lyman α emitting galaxies (LAEs), taken with the astronomical thermal emission camera (AzTEC) on the Atacama Submillimeter Telescope Experiment (ASTE).We imaged a 950-arcmin2 field down to a 1σ sensitivity of 0.7-1.3 mJy beam-1 to find 125 submillimetre galaxies (SMGs) with a signal-to-noise ratio ≥3.5. Counterpart identification using radio and near/mid-infrared data was performed and one or more counterpart candidates were found for 59 SMGs. Photometric redshifts based on optical to near-infrared images were evaluated for 45 of these SMGs with Spitzer/IRAC data and the median value is found to be z =2.4. By combining these estimations with estimates from the literature, we determined that 10 SMGs might lie within the large-scale structure at z = 3.1. The two-point angular crosscorrelation function between LAEs and SMGs indicates that the positions of the SMGs are correlated with the z = 3.1 protocluster. These results suggest that the SMGs were formed and evolved selectively in the high dense environment of the high-redshift Universe. This picture is consistent with the predictions of the standard model of hierarchical structure formation.

Original languageEnglish
Pages (from-to)3462-3478
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 2014 Jun


  • Galaxies: distances and redshifts
  • Galaxies: formation
  • Galaxies: high-redshift
  • Large-scale structure of universe
  • Submillimetre: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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