Characterization of Scuba-2 450 μm and 850 μm selected galaxies in the COSMOS field
By C. Casey, Chian-Chou Chen, L. Cowie, A. Barger, P. Capak, O. Ilbert, M. Koss, N. Lee, É. Le Floc'h, D. Sanders and 6 more. 2013
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We present deep 450 μm and 850 μm observations of a large, uniformly covered 394 arcmin2 area in the Cosmic Evolution Survey (COSMOS) field obtained with the SCUBA-2 instrument on the James Clerk Maxwell Telescope (JCMT). We achieve root-mean-square noise values of σ450 = 4.13 mJy and σ850 = 0.80 mJy. The differential and cumulative number counts are presented and compared to similar previous works. Individual point sources are identified at >3.6σ significance, a threshold corresponding to a 3–5 per cent sample contamination rate. We identify 78 sources at 450 μm and 99 at 850 μm, with flux densities S450 = 13–37 mJy and S850 = 2–16 mJy. Only 62–76 per cent of 450 μm sources are 850 μm detected and 61–81 per cent of 850 μm sources are 450 μm detected. The positional uncertainties at 450 μm are small (1–2.5 arcsec) and therefore allow a precise identification of multiwavelength counterparts without reliance on detection at 24 μm or radio wavelengths; we find that only 44 per cent of 450 μm sources and 60 per cent of 850 μm sources have 24 μm or radio counterparts. 450 μm selected galaxies peak at 〈z〉 = 1.95 ± 0.19 and 850 μm selected galaxies peak at 〈z〉 = 2.16 ± 0.11. The two samples occupy similar parameter space in redshift and luminosity, while their median SED peak wavelengths differ by ∼20–50 μm (translating to ΔTdust = 8–12 K, where 450 μm selected galaxies are warmer). The similarities of the 450 μm and 850 μm populations, yet lack of direct overlap between them, suggests that submillimetre surveys conducted at any single far-infrared wavelength will be significantly incomplete (≳30 per cent) at censusing infrared-luminous star formation at high z.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/0786694d0e841f062fb199b95006b0645d4ff32d
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Citations in the corpus
- REGULARITY UNDERLYING COMPLEXITY: A REDSHIFT-INDEPENDENT DESCRIPTION OF THE CONTINUOUS VARIATION OF GALAXY-SCALE MOLECULAR GAS PROPERTIES IN THE MASS-STAR FORMATION RATE PLANE (2013, unknown): “…underestimate the true SFR of dusty SBs (e.g., Hughes et al. 1998, Trentham et al. 1999, Buat et al. 2005, Chapman et al. 2005, Daddi et al. 2007a, Casey et al. 2013) and place these on the locus of the starforming MS. Obtaining good statistics on the rare starbursting sources (comoving number…”
- Dusty Star Forming Galaxies at High Redshift (2014, background): “The resulting estimates to number counts (extrapolated well beyond the nominal Herschel confusion limit) held up to more recent results from Scuba-2 (Chen et al., 2013a; Geach et al., 2013; Casey et al., 2013).”
- GOODS-ALMA: 1.1 mm galaxy survey (2018, background): “…greater than 100 M year−1 (e.g. Magnelli et al. 2012; Swinbank et al. 2014) - making them significant contributors to the cosmic star formation (e.g. Casey et al. 2013), often driven by mergers (e.g. Tacconi et al. 2008; Narayanan et al. 2010) and often host an active galactic nucleus (AGN; e.g.…”
- AN ALMA SURVEY OF SUBMILLIMETER GALAXIES IN THE EXTENDED CHANDRA DEEP FIELD SOUTH: THE REDSHIFT DISTRIBUTION AND EVOLUTION OF SUBMILLIMETER GALAXIES (2013, background): “As such, we do not compare our results to redshift distributions derived from single-dish sub-mm/mm surveys (i.e. Aretxaga et al. 2007; Chapin et al. 2009; Wardlow et al. 2011; Yun et al. 2012; Casey et al. 2013).”