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Article Dans Une Revue The Astrophysical Journal Année : 2021

The ALMA Spectroscopic Survey in the HUDF: A Search for [C ii] Emitters at 6 ≤ z ≤ 8

Pierre Cox
Bade D. Uzgil
  • Fonction : Auteur
Pascal A. Oesch
  • Fonction : Auteur
Fabian Walter
Manuel Aravena
Leindert Boogaard
Roberto Decarli
Yoshi Fudamoto
  • Fonction : Auteur
Hanae Inami
Rychard Bouwens
Paulo C. Cortes
  • Fonction : Auteur
Jorge González-López
Ivo Labbe
  • Fonction : Auteur
Gergö Popping
Dominik Riechers
Mauro Stefanon
Paul van Der Werf
Axel Weiss
Bade Uzgil
Pascal Oesch
Paulo Cortes

Résumé

The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Band 6 scan (212-272 GHz) covers potential [CII] emission in galaxies at $6\leq z \leq8$ throughout a 2.9 arcmin$^2$ area. By selecting on known Lyman-$\alpha$ emitters (LAEs) and photometric dropout galaxies in the field, we perform targeted searches down to a 5$\sigma$ [CII] luminosity depth $L_{\mathrm{[CII]}}\sim2.0\times10^8$ L$_{\odot}$, corresponding roughly to star formation rates (SFRs) of $10$-$20$ M$_{\odot}$ yr$^{-1}$ when applying a locally calibrated conversion for star-forming galaxies, yielding zero detections. While the majority of galaxies in this sample are characterized by lower SFRs, the resulting upper limits on [CII] luminosity in these sources are consistent with the current literature sample of targeted ALMA observations of $z=6$-$7$ LAEs and Lyman-break galaxies (LBGs), as well as the locally calibrated relations between $L_{\mathrm{[CII]}}$ and SFR -- with the exception of a single [CII]-deficient, UV luminous LBG. We also perform a blind search for [CII]-bright galaxies that may have been missed by optical selections, resulting in an upper limit on the cumulative number density of [CII] sources with $L_{\mathrm{[CII]}}>2.0\times10^8$ L$_{\odot}$ ($5\sigma $) to be less than $1.8\times10^{-4}$ Mpc$^{-3}$ (90% confidence level). At this luminosity depth and volume coverage, we present an observed evolution of the [CII] luminosity function from $z=6$-$8$ to $z\sim0$ by comparing the ASPECS measurement to literature results at lower redshift.

Dates et versions

hal-03435419 , version 1 (18-11-2021)

Identifiants

Citer

Pierre Cox, Bade D. Uzgil, Pascal A. Oesch, Fabian Walter, Manuel Aravena, et al.. The ALMA Spectroscopic Survey in the HUDF: A Search for [C ii] Emitters at 6 ≤ z ≤ 8. The Astrophysical Journal, 2021, 912 (1), pp.67. ⟨10.3847/1538-4357/abe86b⟩. ⟨hal-03435419⟩
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