Optical-faint, far-infrared-bright herschel sources in the candels fields: Ultra-luminous infrared galaxies at z > 1 and the effect of source blending

Haojing Yan, Mauro Stefanon, Zhiyuan Ma, S. P. Willner, Rachel Somerville, Matthew L N Ashby, Romeel S Dave, Pablo G. Pérez-González, Antonio Cava, Tommy Wiklind, Dale Kocevski, Marc Rafelski, Jeyhan Kartaltepe, Asantha Cooray, Anton M. Koekemoer, N. A G Norman

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Herschel very wide field surveys have charted hundreds of square degrees in multiple far-IR (FIR) bands. While the Sloan Digital Sky Survey (SDSS) is currently the best resource for optical counterpart identifications over such wide areas, it does not detect a large number of Herschel FIR sources and leaves their nature undetermined. As a test case, we studied seven "SDSS-invisible," very bright 250 μm sources (S 250 > 55 mJy) in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields where we have a rich multi-wavelength data set. We took a new approach to decompose the FIR sources, using the near-IR or the optical images directly for position priors. This is an improvement over the previous decomposition efforts where the priors are from mid-IR data that still suffer from the problem of source blending. We found that in most cases the single Herschel sources are made of multiple components that are not necessarily at the same redshifts. Our decomposition succeeded in identifying and extracting their major contributors. We show that these are all ultra-luminous infrared galaxies at z 1-2 whose high L IR is mainly due to dust-obscured star formation. Most of them would not be selected as submillimeter galaxies. They all have complicated morphologies indicative of mergers or violent instability, and their stellar populations are heterogeneous in terms of stellar masses, ages, and formation histories. Their current ultra-luminous infrared galaxy phases are of various degrees of importance in their stellar mass assembly. Our practice provides a promising starting point for developing an automatic routine to reliably study bright Herschel sources.

Original languageEnglish (US)
Article number2
JournalAstrophysical Journal, Supplement Series
Volume213
Issue number1
DOIs
StatePublished - Jul 1 2014
Externally publishedYes

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field survey
decomposition
galaxies
merger
near infrared
dust
stellar mass
wavelength
resource
assembly
history
leaves
effect
star formation
resources
histories
wavelengths
test

Keywords

  • galaxies: starburst
  • infrared: galaxies
  • methods: data analysis
  • submillimeter: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Optical-faint, far-infrared-bright herschel sources in the candels fields : Ultra-luminous infrared galaxies at z > 1 and the effect of source blending. / Yan, Haojing; Stefanon, Mauro; Ma, Zhiyuan; Willner, S. P.; Somerville, Rachel; Ashby, Matthew L N; Dave, Romeel S; Pérez-González, Pablo G.; Cava, Antonio; Wiklind, Tommy; Kocevski, Dale; Rafelski, Marc; Kartaltepe, Jeyhan; Cooray, Asantha; Koekemoer, Anton M.; Norman, N. A G.

In: Astrophysical Journal, Supplement Series, Vol. 213, No. 1, 2, 01.07.2014.

Research output: Contribution to journalArticle

Yan, H, Stefanon, M, Ma, Z, Willner, SP, Somerville, R, Ashby, MLN, Dave, RS, Pérez-González, PG, Cava, A, Wiklind, T, Kocevski, D, Rafelski, M, Kartaltepe, J, Cooray, A, Koekemoer, AM & Norman, NAG 2014, 'Optical-faint, far-infrared-bright herschel sources in the candels fields: Ultra-luminous infrared galaxies at z > 1 and the effect of source blending', Astrophysical Journal, Supplement Series, vol. 213, no. 1, 2. https://doi.org/10.1088/0067-0049/213/1/2
Yan, Haojing ; Stefanon, Mauro ; Ma, Zhiyuan ; Willner, S. P. ; Somerville, Rachel ; Ashby, Matthew L N ; Dave, Romeel S ; Pérez-González, Pablo G. ; Cava, Antonio ; Wiklind, Tommy ; Kocevski, Dale ; Rafelski, Marc ; Kartaltepe, Jeyhan ; Cooray, Asantha ; Koekemoer, Anton M. ; Norman, N. A G. / Optical-faint, far-infrared-bright herschel sources in the candels fields : Ultra-luminous infrared galaxies at z > 1 and the effect of source blending. In: Astrophysical Journal, Supplement Series. 2014 ; Vol. 213, No. 1.
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AU - Somerville, Rachel

AU - Ashby, Matthew L N

AU - Dave, Romeel S

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