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

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

来源：Monthly Notices of the Royal Astronomical Society, 2014, 440(4): 3462-3478.

DOI：10.1093/mnras/stu447

• galaxies: distances and redshifts
• galaxies: formation
• galaxies: high-redshift
• large-scale structure of Universe
• submillimetre: galaxies

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 alpha emitting galaxies (LAEs), taken with the astronomical thermal emission camera (AzTEC) on the Atacama Submillimeter Telescope Experiment (ASTE). We imaged a 950-arcmin(2) field down to a 1 sigma sensitivity of 0.7-1.3 mJy beam(-1) to find 125 submillimetre galaxies (SMGs) with a signal-to-noise ratio %26gt;= 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 cross-correlation 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.

• 出版日期2014-6
• 单位中国科学院国家天文台