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

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

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


Authors

Jorge González-López

Mladen Novak

Roberto Decarli

Fabian Walter

Manuel Aravena

Chris Carilli

Leindert Boogaard

Gergö Popping

Axel Weiss

Roberto J. Assef

Franz Erik Bauer

Rychard Bouwens

Paulo C. Cortes

Pierre Cox

Emanuele Daddi

Elisabete da Cunha

Tanio Díaz-Santos

Rob Ivison

Benjamin Magnelli

Dominik Riechers

Paul van der Werf

Jeff Wagg



Abstract

We present the results from the 1.2 mm continuum image obtained as part of the Atacama Large Millimeter/ submillimeter Array Spectroscopic Survey in the Hubble Ultra Deep Field. The 1.2 mm continuum image has a size of 2.9 (4.2) arcmin2 within a primary beam response of 50% (10%) and an rms value of m - 9.3 Jy beam 1. We detect 35 sources at high significance (Fidelity …0.5); 32 have well-characterized near-infrared Hubble Space Telescope counterparts. We estimate the 1.2 mm number counts to flux levels of <30 Jy m in two different ways: we first use the detected sources to constrain the number counts and find a significant flattening of the counts below Sν ∼ 0.1 mJy. In a second approach, we constrain the number counts 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 jackknifing 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 ∼93% (∼100% if we include the lower fidelity detections) of the total continuum dust emission associated with galaxies in the Hubble Ultra Deep Field. The ancillary data allow us to study the dependence of the 1.2 mm number counts on redshift (z = 0−4), galaxy dust mass (M M dust = 10 10 –  7 9 ), stellar mass (M M = 10 10 – 9 12* ), and star formation rate ( = -  M - SFR 1 1000 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.

Citation

González-López, J., Novak, M., Decarli, R., Walter, F., Aravena, M., Carilli, C., …Wagg, J. (2020). The ALMA Spectroscopic Survey in the HUDF: Deep 1.2 mm Continuum Number Counts. Astrophysical Journal, 897(1), Article 897. https://doi.org/10.3847/1538-4357/ab765b

Journal Article Type Article
Acceptance Date Feb 11, 2020
Online Publication Date Jul 6, 2020
Publication Date 2020-07
Deposit Date Jul 29, 2020
Publicly Available Date Jul 29, 2020
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 897
Issue 1
Article Number 897
DOI https://doi.org/10.3847/1538-4357/ab765b

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Copyright Statement
© 2020. The American Astronomical Society. All rights reserved.





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