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- Title
SXDF-ALMA 2 arcmin² deep survey: Resolving and characterizing the infrared extragalactic background light down to 0.5 mJy.
- Authors
Yuki YAMAGUCHI; Yoichi TAMURA; Kotaro KOHNO; Itziar ARETXAGA; DUNLOP, James S.; Bunyo HATSUKADE; HUGHES, David; Soh IKARASHI; Shun ISHII; IVISON, Rob J.; Takuma IZUMI; Ryohei KAWABE; Tadayuki KODAMA; Minju LEE; Ryu MAKIYA; Yuichi MATSUDA; Kouichiro NAKANISHI; Kouji OHTA; Wiphu RUJOPAKARN; Ken-ichi TADAKI
- Abstract
We present a multiwavelength analysis of five submillimeter sources (S1.1mm = 0.54-2.02 mJy) that were detected during our 1.1 mm deep continuum survey in the Subaru/XMM-Newton Deep Survey Field (SXDF)-UDS-CANDELS field (2 arcmin², 1σ = 0.055 mJy beam-1) using the Atacama Large Millimeter/submillimeter Array (ALMA). The two brightest sources correspond to a known single-dish (AzTEC) selected bright sub- millimeter galaxy (SMG), whereas the remaining three are faint SMGs newly uncovered by ALMA. If we exclude the two brightest sources, the contribution of the ALMA-detected faint SMGs to the infrared extragalactic background light is estimated to be ~ 4.1+5.4-3.0 Jy deg-2, which corresponds to ~ 1622-12% of the infrared extragalactic background light. This suggests that their contribution to the infrared extragalactic background light is as large as that of bright SMGs. We identified multiwavelength counterparts of the five ALMA sources. One of the sources (SXDF-ALMA3) is extremely faint in the optical to near-infrared region despite its infrared luminosity (LIR ≃ 1 x 1012 L&#8857 or SFR ≃ 100 M&#8857 yr-1). By fitting the spectral energy distributions at the optical-to-near-infrared wavelengths of the remaining four ALMA sources, we obtained the photometric redshifts (zphoto) and stellar masses (M*): zphoto ≃ 1.3-2.5, M* ≃ (3.5-9.5) 1010 M&#8857. We also derived their star formation rates (SFRs) and specific SFRs as ≃ 30-200 M&#8857 yr-1 and ≃ 0.8-2 Gyr-1, respectively. These values imply that they are main sequence star-forming galaxies.
- Subjects
STELLAR evolution; GALACTIC redshift; SUBMILLIMETER astronomy; COSMIC background radiation; STELLAR luminosity function
- Publication
Publications of the Astronomical Society of Japan, 2016, Vol 68, Issue 5, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psw073