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Paper: AzTEC/ASTE Deep and Wide Submillimeter Galaxy Survey in the Subaru/XMM-Newton Deep Field: Identification of VLA, Spitzer and Herschel Counterparts to 1100-μm-Selected Galaxies and Redshifts
Volume: 476, New Trends in Radio Astronomy in the ALMA Era
Page: 265
Authors: Ikarashi, S.; Kohno, K.; Aretxaga, I.; Arumugam, V.; Caputi, K.; Dunlop, J.; Hatsukade, B.; Hughes, D.; Iono, D.; Ivison, R.; Kawabe, R.; Motohara, K.; Nakanishi, K.; Ohta, K.; Suzuki, K.; Tamura, Y.; Umehata, H.; Wilson, G.; Yabe, K.; Yun, M.
Abstract: We present results of our AzTEC/ASTE submillimeter galaxies (SMGs) survey in the Subaru/XMM-Newton Deep Field (SXDF), and VLA (21 cm), Spitzer (3.6-8 μm and 24 μm) and Herschel (100 and 160 μm) counterpart identifications for 1100-μm-selected SMGs. We obtained a 1100-μm map of ∼ 1200 arcmin2 with the rms noise level of ∼ 0.5 mJy (1 σ). Our AzTEC map achieved new detections of 281 sources (S/N ≥ 3.5 σ). For 221 of 281 AzTEC sources, we searched counterparts in order to obtain multi-wavelength data. Deep Herschel PACS 100-μm and 160-μm images cover the whole of the AzTEC map, and 34 of 221 (= 15 %) and 54 of 221 (= 24 %)AzTEC sources have PACS 100-μm and 160-μm counterparts, respectively. We found VLA radio and/or MIPS 24-μm robust (with a significance of ≥ 95 %) counterparts to 102 of 221 the AzTEC SMGs. In addition to this, we have developed an improved identification method using IRAC data (3.6-8 μm) and their colors, in order to cover the AzTEC SMGs located at higher redshift such as z > 3, which is inaccessible with the existing VLA, MIPS and Herschel data alone. With this method, we have achieved another robust detections of 20 IRAC counterparts to AzTEC sources. 131 of 221 AzTEC sources have at least one robust counterparts, and 23 of 221 have more than two robust counterparts. Including tentative identifications (with a significance of ≥ 90 %), 171 of 221 (= 78 %) 1100-μm-selected SMGs have counterparts. We estimated photometric redshifts of the counterparts using deep near-, and med-infrared and optical data, providing zmedian of 2.2. Among them, we found that there were some 1100-μm sources faint in multi-bands data suggesting the extremely high redshift.
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