A REDSHIFT SURVEY OF HERSCHEL FAR-INFRARED SELECTED STARBURSTS AND IMPLICATIONS FOR OBSCURED STAR FORMATION - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2012

A REDSHIFT SURVEY OF HERSCHEL FAR-INFRARED SELECTED STARBURSTS AND IMPLICATIONS FOR OBSCURED STAR FORMATION

C. M. Casey
  • Fonction : Auteur
S. Berta
M. Bethermin
  • Fonction : Auteur
J. Bock
  • Fonction : Auteur
C. Bridge
  • Fonction : Auteur
J. Budynkiewicz
  • Fonction : Auteur
D. Burgarella
E. Chapin
  • Fonction : Auteur
S. C. Chapman
  • Fonction : Auteur
D. L. Clements
  • Fonction : Auteur
A. Conley
  • Fonction : Auteur
C. J. Conselice
  • Fonction : Auteur
A. Cooray
  • Fonction : Auteur
D. Farrah
  • Fonction : Auteur
E. Hatziminaoglou
  • Fonction : Auteur
R. J. Ivison
  • Fonction : Auteur
E. Le Floc'H
  • Fonction : Auteur
D. Lutz
G. Magdis
  • Fonction : Auteur
B. Magnelli
S. J. Oliver
  • Fonction : Auteur
M. J. Page
  • Fonction : Auteur
F. Pozzi
  • Fonction : Auteur
D. Rigopoulou
  • Fonction : Auteur
L. Riguccini
  • Fonction : Auteur
I. G. Roseboom
  • Fonction : Auteur
D. B. Sanders
  • Fonction : Auteur
Douglas Scott
N. Seymour
  • Fonction : Auteur
I. Valtchanov
  • Fonction : Auteur
J. D. Vieira
  • Fonction : Auteur
M. Viero
  • Fonction : Auteur
J. Wardlow
  • Fonction : Auteur

Résumé

We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500 mu m, taken with the Keck I Low Resolution Imaging Spectrometer and the Keck II DEep Imaging Multi-Object Spectrograph. The redshift distribution of these SPIRE sources from the Herschel Multitiered Extragalactic Survey peaks at z = 0.85, with 731 sources at z \textless 2 and a tail of sources out to z similar to 5. We measure more significant disagreement between photometric and spectroscopic redshifts (\textlessDelta z/(1 + z(spec))\textgreater = 0.29) than is seen in non-infrared selected samples, likely due to enhanced star formation rates and dust obscuration in infrared-selected galaxies. The infrared data are used to directly measure integrated infrared luminosities and dust temperatures independent of radio or 24 mu m flux densities. By probing the dust spectral energy distribution (SED) at its peak, we estimate that the vast majority (72%-83%) of z \textless 2 Herschel-selected galaxies would drop out of traditional submillimeter surveys at 0.85-1 mm. We find that dust temperature traces infrared luminosity, due in part to the SPIRE wavelength selection biases, and partially from physical effects. As a result, we measure no significant trend in SPIRE color with redshift; if dust temperature were independent of luminosity or redshift, a trend in SPIRE color would be expected. Composite infrared SEDs are constructed as a function of infrared luminosity, showing the increase in dust temperature with luminosity, and subtle change in near-infrared and mid-infrared spectral properties. Moderate evolution in the far-infrared (FIR)/radio correlation is measured for this partially radio-selected sample, with q(IR) proportional to (1 + z)(-0.30 +/- 0.02) at z \textless 2. We estimate the luminosity function and implied star formation rate density contribution of HSGs at z \textless 1.6 and find overall agreement with work based on 24 mu m extrapolations of the LIRG, ULIRG, and total infrared contributions. This work significantly increased the number of spectroscopically confirmed infrared-luminous galaxies at z \textgreater\textgreater 0 and demonstrates the growing importance of dusty starbursts for galaxy evolution studies and the build-up of stellar mass throughout cosmic time.

Dates et versions

hal-01434436 , version 1 (13-01-2017)

Identifiants

Citer

C. M. Casey, S. Berta, M. Bethermin, J. Bock, C. Bridge, et al.. A REDSHIFT SURVEY OF HERSCHEL FAR-INFRARED SELECTED STARBURSTS AND IMPLICATIONS FOR OBSCURED STAR FORMATION. The Astrophysical Journal, 2012, 761 (2), ⟨10.1088/0004-637X/761/2/140⟩. ⟨hal-01434436⟩
47 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More