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  • THE EVOLUTION OF INTERSTELL...
    Scoville, N; Aussel, H; Sheth, K; Scott, K S; Sanders, D; Ivison, R; Pope, A; CAPAK, P; Vanden Bout, P; Manohar, S; KARTALTEPE, J; Robertson, B; Lilly, S

    The Astrophysical journal, 03/2014, Letnik: 783, Številka: 2
    Journal Article

    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 super(*) Asymptotically = to 10 super(11)M sub(middot in circle): 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 from1 to 2 x 10 super(10)M sub(middot in circle) at both z = 2 and 0.9 down to ~2 x 2 shows a further ~4 times increase in M sub(ISM) compared with the equivalent non-infrared-bright sample at the same redshift. The gas mass fractions are ~2% + or - 0.5%, 12% + or - 3%, 14% + or - 2%, and 53% + or - 3% for the four subsamples (z = 0.4, 0.9, and 2 and infrared-bright galaxies).