Properties of the Scuba-2 850㎛ Sources in the XMM-LSS Field

Abstract

Abstract:We carry out the study of 850 µm sources in a part of the XMM-LSS field. The 850 µm imaging data were obtained by the SCUBA-2 on the James Clerk Maxwell Telescope (JCMT) for three days in July 2015 with an integration time of 6.1 hours, covering a circular area with a radius of 15 ′ . We choose the central area up to a radius of 9.′ 15 for the study, where the noise distribution is relatively uniform. The root mean square (rms) noise at the center is 2.7 mJy. We identify 17 sources with S/N > 3.5. Differential number count is estimated in flux range between 3.5 and 9.0 mJy after applying various corrections derived by imaging simulations, which is consistent with previous studies. For detailed study on the individual sources, we select three sources with more reliable measurements (S/N > 4.5), and construct their spectral energy distributions (SEDs) from optical to far-infrared band. Redshift distribution of the sources ranges from 0.36 to 3.28, and their physical parameters are extracted using MAGPHYS model, which yield infrared luminosity L IR = 10 11.3 −10 13.4 L ⊙ , star formation rate SFR = 10 1.3 −10 3.2 M ⊙ yr −1 and dust temperature T D = 30−53 K. We investigate the correlation between L IR and T D , which appears to be consistent with previous studies.