The ALMA Spectroscopic Survey Large Program: The Infrared Excess of z = 1.5–10 UV-selected Galaxies and the Implied High-redshift Star Formation History - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2020

The ALMA Spectroscopic Survey Large Program: The Infrared Excess of z = 1.5–10 UV-selected Galaxies and the Implied High-redshift Star Formation History

Pierre Cox
Rychard Bouwens
Jorge González-López
Manuel Aravena
Roberto Decarli
Mladen Novak
Mauro Stefanon
Fabian Walter
Leindert Boogaard
Ugne Dudzeviciute
  • Fonction : Auteur
Ian Smail
Emanuele Daddi
Elisabete da Cunha
Rob Ivison
Themiya Nanayakkara
Paulo Cortes
Hanae Inami
Pascal Oesch
Gergö Popping
Dominik Riechers
Paul van Der Werf
Axel Weiss
Yoshi Fudamoto
  • Fonction : Auteur
Jeff Wagg
  • Fonction : Auteur
Ugnė Dudzevičiūtė
  • Fonction : Auteur

Résumé

We make use of sensitive (9.3 microJy/beam RMS) 1.2mm-continuum observations from the ASPECS ALMA large program of the Hubble Ultra Deep Field (HUDF) to probe dust-enshrouded star formation from 1362 Lyman-break galaxies spanning the redshift range z=1.5-10 (to ~7-28 Msolar/yr at 4 sigma over the entire range). We find that the fraction of ALMA-detected galaxies in our z=1.5-10 samples increases steeply with stellar mass, with the detection fraction rising from 0% at 10^9 Msolar to 85(-18)(+9)% at >10^{10} Msolar. Moreover, stacking all 1253 low-mass (<10^{9.25} Msolar) galaxies over the ASPECS footprint, we find a mean continuum flux of -0.1+/-0.4 microJy/beam, implying a hard upper limit on the obscured SFR of <0.6 Msolar/yr (4 sigma) in a typical low-mass galaxy. The correlation between the infrared excess IRX of UV-selected galaxies (L(IR)/L(UV)) and the UV-continuum slope is also seen in our ASPECS data and shows consistency with a Calzetti-like relation at >10^{9.5} M_{solar} and a SMC-like relation at lower masses. Using stellar-mass and beta measurements for z~2 galaxies over CANDELS, we derive a new empirical relation between beta and stellar mass and then use this correlation to show that our IRX-beta and IRX-stellar mass relations are consistent with each other. We then use these constraints to express the infrared excess as a bivariate function of beta and stellar mass. Finally, we present updated estimates of star-formation rate density determinations at z>3, leveraging current improvements in the measured infrared excess and recent probes of ultra-luminous far-IR galaxies at z>2.

Dates et versions

hal-03435537 , version 1 (18-11-2021)

Identifiants

Citer

Pierre Cox, Rychard Bouwens, Jorge González-López, Manuel Aravena, Roberto Decarli, et al.. The ALMA Spectroscopic Survey Large Program: The Infrared Excess of z = 1.5–10 UV-selected Galaxies and the Implied High-redshift Star Formation History. The Astrophysical Journal, 2020, 902 (2), pp.112. ⟨10.3847/1538-4357/abb830⟩. ⟨hal-03435537⟩
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