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Article Dans Une Revue The Astrophysical Journal Année : 2020

The ALMA Spectroscopic Survey in the HUDF: Deep 1.2 mm Continuum Number Counts

Pierre Cox
Jorge González-López
Mladen Novak
Roberto Decarli
Fabian Walter
Manuel Aravena
Leindert Boogaard
Gergö Popping
Axel Weiss
Roberto J. Assef
  • Fonction : Auteur
Franz Erik Bauer
Rychard Bouwens
Paulo C. Cortes
  • Fonction : Auteur
Emanuele Daddi
Elisabete da Cunha
Tanio Díaz-Santos
Rob Ivison
Benjamin Magnelli
Dominik Riechers
Ian Smail
Paul van Der Werf
Jeff Wagg
  • Fonction : Auteur
Chris Carilli
Roberto Assef
Paulo Cortes
Elisabete Da Cunha
Paul van Der Werf

Résumé

We present the results from the 1.2 mm continuum image obtained as part of the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS). The 1.2 mm continuum image has a size of 2.9 (4.2) arcmin$^2$ within a primary beam response of 50% (10%) and a rms value of $9.3\thinspace{\rm\mu Jy\thinspace beam^{-1}}$. We detect 35 sources at high significance (Fidelity $\geq0.5$), 32 of these have well characterized near-infrared HST counterparts. We estimate the 1.2 mm number counts to flux levels of $<30\thinspace{\rm\mu Jy}$ in two different ways: we first use the detected sources to constrain the number counts and find a significant flattening of the counts below $S_\nu \sim 0.1$ mJy. In a second approach, we constrain the number counts by using a probability of deflection statistics (P(D)) analysis. For this latter approach, we describe new methods to accurately measure the noise in interferometric imaging (employing jack-knifing in the cube and in the visibility plane). This independent measurement confirms the flattening of the number counts. Our analysis of the differential number counts shows that we are detecting $\sim$93% ($\sim$100% if we include the lower fidelity detections) of the total continuum dust emission associated to galaxies in the HUDF. The ancillary data allows us to study the dependence of the 1.2 mm number counts on redshift ($z=0-4$), galaxy dust mass (${\rm M}_{\rm dust}=10^{7}-10^{9}{\rm M}_{\odot}$), stellar mass (${\rm M}_{*}=10^{9}-10^{12}{\rm M}_{\odot}$), and star-formation rate (${\rm SFR}=1-1000\thinspace{\rm M}_{\odot}\thinspace{\rm yr^{-1}}$). In an accompanying paper we show that the number counts are crucial to constrain galaxy evolution models and the understanding of star-forming galaxies at high redshift.

Dates et versions

hal-03435573 , version 1 (18-11-2021)

Identifiants

Citer

Pierre Cox, Jorge González-López, Mladen Novak, Roberto Decarli, Fabian Walter, et al.. The ALMA Spectroscopic Survey in the HUDF: Deep 1.2 mm Continuum Number Counts. The Astrophysical Journal, 2020, 897 (1), pp.91. ⟨10.3847/1538-4357/ab765b⟩. ⟨hal-03435573⟩
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