The evolution of interstellar medium mass probed by dust emission: Alma observations at z = 0.3-2

Abstract

The use of submillimeter dust continuum emission to probe the mass of interstellar dust and gas in galaxies is empirically calibrated using samples of local star-forming galaxies, Planck observations of the Milky Way, and high-redshift submillimeter galaxies. All of these objects suggest a similar calibration, strongly supporting the view that the Rayleigh-Jeans tail of the dust emission can be used as an accurate and very fast probe of the interstellar medium (ISM) in galaxies. We present ALMA Cycle 0 observations of the Band 7 (350 GHz) dust emission in 107 galaxies from z = 0.2 to 2.5. Three samples of galaxies with a total of 101 galaxies were stellar-mass-selected from COSMOS to have M * ≃ 1011 M: 37 at z 0.4, 33 at z 0.9, and 31 at z = 2. A fourth sample with six infrared-luminous galaxies at z = 2 was observed for comparison with the purely mass-selected samples. From the fluxes detected in the stacked images for each sample, we find that the ISM content has decreased by a factor 6 from 1 to 2 × 1010 M at both z = 2 and 0.9 down to 2 × 109 M at z = 0.4. The infrared-luminous sample at z = 2 shows a further 4 times increase in M ISM compared with the equivalent non-infrared-bright sample at the same redshift. The gas mass fractions are 2% ± 0.5%, 12% ± 3%, 14% ± 2%, and 53% ± 3% for the four subsamples (z = 0.4, 0.9, and 2 and infrared-bright galaxies). © 2014. The American Astronomical Society. All rights reserved.