“Super-deblended” Dust Emission in Galaxies. II. Far-IR to (Sub)millimeter Photometry and High-redshift Galaxy Candidates in the Full COSMOS Field
Year: 2018
Type: article
Abstract: 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 μ m 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 μ m 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 M ⊙ yr −1 ). The photometric and value-added catalogs are publicly released.
Source: The Astrophysical Journal
Authors: Shuowen Jin, Emanuele Daddi, Daizhong Liu, Vernesa Smolčić, Eva Schinnerer, Antonello Calabrò, Qiusheng Gu, Jacinta Delhaize, Ivan Delvecchio, Yu Gao, Mara Salvato, Annagrazia Puglisi, Mark Dickinson, Frank Bertoldi, Mark Sargent, Mladen Novak, Georgios Magdis, Itziar Aretxaga, Grant W. Wilson, Peter Capak
Institutions: Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Astrophysique, Instrumentation et Modélisation, Sorbonne Paris Cité, Université Paris Diderot, Nanjing University, Chinese Academy of Sciences, Purple Mountain Observatory, Max Planck Institute for Astronomy, University of Zagreb, Max Planck Institute for Extraterrestrial Physics, University of Bonn, University of Sussex, University of Copenhagen, National Institute of Astrophysics, Optics and Electronics, University of Massachusetts Amherst, California Institute of Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2814038463