“Super-deblended” Dust Emission in Galaxies. II. Far-IR to (Sub)millimeter Photometry and High-redshift Galaxy Candidates in the Full COSMOS Field

Shuowen, Jin and Daddi, Emanuele and Liu, Daizhong and Smolčić, Vernesa and Schinnerer, Eva and Calabró, Antonello and Gu, Qiusheng and Delhaize, Jacinta and Delvecchio, Ivan and Gao, Yu and Salvato, Mara and Puglisi, Annagrazia and Dickinson, Mark and Bertoldi, Frank and Sargent, Mark and Novak, Mladen and Magdis, Georgios and Aretxaga, Itziar and 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. Astrophysical Journal, 864. pp. 56-32. ISSN 0004-637X

PDF - Published Version
Language: English

Download (7MB) | Preview


We present a “super-deblended” far-infrared (FIR) to (sub)millimeter photometric catalog in the Cosmic Evolution Survey (COSMOS), prepared with the method recently developed by Liu et al., with key adaptations. We obtain point-spread function fitting photometry at fixed prior positions including 88,008 galaxies detected in VLA 1.4, 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 nonrelevant priors at FIR/(sub)mm bands using spectral energy distribution fitting and redshift information. In order to cope with the shallower COSMOS data, we subtract from the maps the flux of faint nonfitted 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 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 provides a remarkable validation of the technique. We detect 11,220 galaxies over the 100–1200 μm range extending to z_phot ∼ 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 ∼ 1000 Me_⊙ yr^−1 ). The photometric and value-added catalogs are publicly released.

Item Type: Article
Keywords: galaxies: ISM, galaxies: photometry, galaxies: star formation, infrared: galaxies, techniques: photometric
Date: 2018
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2018. The American Astronomical Society. Received 2018 February 6; Revised 2018 July 3; Accepted 2018 July 9; Published 2018 August 30.
Divisions: Faculty of Science > Department of Physics
Publisher: IOP Publishing
Depositing User: Vernesa Smolčić
Date Deposited: 29 Mar 2019 12:56
Last Modified: 29 Mar 2019 12:58
URI: http://digre.pmf.unizg.hr/id/eprint/5911

Actions (login required)

View Item View Item