"Super-deblended" dust emission in galaxies: II. Far-IR to (sub)millimeter photometry and high redshift galaxy candidates in the full COSMOS field

Jin, Shuowen, Daddi, Emanuele, Liu, Daizhong, Smolčić, Vernesa, Schinnerer, Eva, Calabró, Antonello, Gu, Qiusheng, Delhaize, Jacinta, Delvecchio, Ivan, Gao, Yu, Salvato, Mara, Puglisi, Annagrazia, Dickinson, Mark, Bertoldi, Frank, Sargent, Mark, Novak, Mladen, Magdis, Georgios, Aretxaga, Itziar, Wilson, Grant W and Capak, Peter (2018) "Super-deblended" dust emission in galaxies: II. Far-IR to (sub)millimeter photometry and high redshift galaxy candidates in the full COSMOS field. The Astrophysical Journal, 864 (56). pp. 1-32. ISSN 0004-637X

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We present a "super-deblended" far-infrared to (sub)millimeter photometric catalog in the Cosmic Evolution Survey (COSMOS), prepared with the method recently developed by Liu et al. 2018, with key adaptations. We obtain point spread function (PSF) fitting photometry at fixed prior positions including 88,008 galaxies detected in either VLA 1.4~GHz, 3~GHz and/or MIPS 24~μm images. By adding a specifically carved mass-selected sample (with an evolving stellar mass limit), a highly complete prior sample of 194,428 galaxies is achieved for deblending FIR/(sub)mm images. We performed ``active' removal of non relevant priors at FIR/(sub)mm bands using spectral energy distribution (SED) fitting and redshift information. In order to cope with the shallower COSMOS data we subtract from the maps the flux of faint non-fitted priors and explicitly account for the uncertainty of this step. The resulting photometry (including data from Spitzer, Herschel, SCUBA2, AzTEC, MAMBO and NSF's Karl G. Jansky Very Large Array at 3~GHz and 1.4~GHz) displays well behaved quasi-Gaussian uncertainties, calibrated from Monte Carlo simulations and tailored to observables (crowding, residual maps). Comparison to ALMA photometry for hundreds of sources provide a remarkable validation of the technique. We detect 11,220 galaxies over the 100--1200~μm range, extending to zphot∼7. We conservatively selected a sample of 85 z>4 high redshift candidates, significantly detected in the FIR/(sub)mm, often with secure radio and/or Spitzer/IRAC counterparts. This provides a chance to investigate the first generation of vigorous starburst galaxies (SFRs∼1000M⊙~yr−1). The photometric and value added catalogs are publicly released.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Mark Sargent
Date Deposited: 23 Aug 2018 13:20
Last Modified: 02 Jul 2019 14:04
URI: http://sro.sussex.ac.uk/id/eprint/78220

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