Measurements of the Dust Properties in z similar or equal to 1-3 Submillimeter Galaxies with ALMA
Journal article, 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

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

University of Western Australia

Australian National University

J. A. Hodge

Leiden University

C. M. Casey

The University of Texas at Austin

H. S. B. Algera

Leiden University

M. Kaasinen

Max Planck Society

Heidelberg University

I Smail

Durham University

F. Walter

Max Planck Society

W. N. Brandt

Pennsylvania State University

H. Dannerbauer

University of La Laguna

Instituto de Astrofísica de Canarias

R. Decarli

INAF OAS Bologna

B. A. Groves

University of Western Australia

Australian National University

Kirsten Kraiberg Knudsen

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

A. M. Swinbank

Durham University

A. Weiss

Max Planck Society

P. van der Werf

Leiden University

J. A. Zavala

The University of Texas at Austin

Astrophysical Journal

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

Vol. 919 1 30

Subject Categories

Meteorology and Atmospheric Sciences

Astronomy, Astrophysics and Cosmology

Other Physics Topics



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