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The Atacama Large Millimeter/submillimeter Array Spectroscopic Survey in the Hubble Ultra Deep Field: CO Emission Lines and 3 mm Continuum Sources

González-López, Jorge; Decarli, Roberto; Pavesi, Riccardo; Walter, Fabian; Aravena, Manuel; Carilli, Chris; Boogaard, Leindert; Popping, Gergö; Weiss, Axel; Assef, Roberto J.; Bauer, Franz Erik; Bertoldi, Frank; Bouwens, Richard; Contini, Thierry; Cortes, Paulo C.; Cox, Pierre; da Cunha, Elisabete; Daddi, Emanuele; Díaz-Santos, Tanio; Inami, Hanae; Hodge, Jacqueline; Ivison, Rob; Le Fèvre, Olivier; Magnelli, Benjamin; Oesch, Pascal; Riechers, Dominik; Rix, Hans-Walter; Smail, Ian; Swinbank, A.M.; Somerville, Rachel S.; Uzgil, Bade; van der Werf, Paul

The Atacama Large Millimeter/submillimeter Array Spectroscopic Survey in the Hubble Ultra Deep Field: CO Emission Lines and 3 mm Continuum Sources Thumbnail


Jorge González-López

Roberto Decarli

Riccardo Pavesi

Fabian Walter

Manuel Aravena

Chris Carilli

Leindert Boogaard

Gergö Popping

Axel Weiss

Roberto J. Assef

Franz Erik Bauer

Frank Bertoldi

Richard Bouwens

Thierry Contini

Paulo C. Cortes

Pierre Cox

Elisabete da Cunha

Emanuele Daddi

Tanio Díaz-Santos

Hanae Inami

Jacqueline Hodge

Rob Ivison

Olivier Le Fèvre

Benjamin Magnelli

Pascal Oesch

Dominik Riechers

Hans-Walter Rix

Rachel S. Somerville

Bade Uzgil

Paul van der Werf


The Atacama Large Millimeter/submillimeter Array (ALMA) SPECtroscopic Survey in the Hubble Ultra Deep Field (HUDF) is an ALMA large program that obtained a frequency scan in the 3 mm band to detect emission lines from the molecular gas in distant galaxies. Here we present our search strategy for emission lines and continuum sources in the HUDF. We compare several line search algorithms used in the literature, and critically account for the line widths of the emission line candidates when assessing significance. We identify 16 emission lines at high fidelity in our search. Comparing these sources to multiwavelength data we find that all sources have optical/ infrared counterparts. Our search also recovers candidates of lower significance that can be used statistically to derive, e.g., the CO luminosity function. We apply the same detection algorithm to obtain a sample of six 3 mm continuum sources. All of these are also detected in the 1.2 mm continuum with optical/near-infrared counterparts. We use the continuum sources to compute 3 mm number counts in the sub-millijansky regime, and find them to be higher by an order of magnitude than expected for synchrotron-dominated sources. However, the number counts are consistent with those derived at shorter wavelengths (0.85–1.3 mm) once extrapolating to 3 mm with a dust emissivity index of β = 1.5, dust temperature of 35 K, and an average redshift of z = 2.5. These results represent the best constraints to date on the faint end of the 3 mm number counts.

Journal Article Type Article
Acceptance Date Mar 17, 2019
Online Publication Date Sep 11, 2019
Publication Date Sep 10, 2019
Deposit Date Oct 8, 2019
Publicly Available Date Oct 8, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 882
Issue 2
Public URL


Published Journal Article (4.3 Mb)

Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.

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