Measurements of the Dust Properties in z similar or equal to 1-3 Submillimeter Galaxies with ALMA
Artikel i vetenskaplig tidskrift, 2021

We present Atacama Large Millimeter/submillimeter Array (ALMA) 2 mm continuum observations of a complete and unbiased sample of 99 870 mu m selected submillimeter galaxies (SMGs) in the Extended Chandra Deep Field South (ALESS). Our observations of each SMG reach average sensitivities of 53 mu Jy beam(-1). We measure the flux densities for 70 sources, for which we obtain a typical 870 mu m-to-2 mm flux ratio of 14 +/- 5. We do not find a redshift dependence of this flux ratio, which would be expected if the dust emission properties of our SMGs were the same at all redshifts. By combining our ALMA measurements with existing Herschel/SPIRE observations, we construct a (biased) subset of 27 galaxies for which the cool dust emission is sufficiently well sampled to obtain precise constraints on their dust properties using simple isothermal models. Thanks to our new 2 mm observations, the dust emissivity index is well constrained and robust against different dust opacity assumptions. The median dust emissivity index of our SMGs is beta similar or equal to 1.9 +/- 0.4, consistent with the emissivity index of dust in the Milky Way and other local and high-redshift galaxies, as well as classical dust-grain model predictions. We also find a negative correlation between the dust temperature and beta, similar to low-redshift observational and theoretical studies. Our results indicate that beta similar or equal to 2 in high-redshift dusty star-forming galaxies, implying little evolution in dust-grain properties between our SMGs and local dusty galaxy samples, and suggesting that these high-mass and high-metallicity galaxies have dust reservoirs driven by grain growth in their interstellar medium.


E. da Cunha

Australian National University

University of Western Australia

ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)

J. A. Hodge

Universiteit Leiden

C. M. Casey

The University of Texas at Austin

H. S. B. Algera

Universiteit Leiden

M. Kaasinen


Universität Heidelberg

I Smail

Durham University

F. Walter


W. N. Brandt

Pennsylvania State University

H. Dannerbauer

Instituto de Astrofísica de Canarias

Universidad de la Laguna

R. Decarli

Istituto nazionale di astrofisica (INAF)

B. A. Groves

University of Western Australia

Australian National University

Kirsten Kraiberg Knudsen

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

A. M. Swinbank

Durham University

A. Weiss


P. van der Werf

Universiteit Leiden

J. A. Zavala

The University of Texas at Austin

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 919 1 30


Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi

Annan fysik



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