2016
DOI: 10.3847/0004-637x/820/2/83
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Ism Masses and the Star Formation Law at Z = 1 to 6: Alma Observations of Dust Continuum in 145 Galaxies in the Cosmos Survey Field

Abstract: ALMA Cycle 2 observations of the long wavelength dust emission in 145 star-forming galaxies are used to probe the evolution of star-forming ISM. We also develop the physical basis and empirical calibration (with 72 low-z and z ∼2 galaxies) for using the dust continuum as a quantitative probe of interstellar medium (ISM) masses. The galaxies with highest star formation rates (SFRs) at < z > = 2.2 and 4.4 have gas masses up to 100 times that of the Milky Way and gas mass fractions reaching 50 to 80%, i.e. gas ma… Show more

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Cited by 461 publications
(602 citation statements)
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References 86 publications
(122 reference statements)
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“…However, this approach relies on the assumption of a dust-to-gas mass ratio (DGR), which typically depends on the gas metallicity (Bolatto et al 2013;Sandstrom et al 2013;Genzel et al 2015). Recent ALMA results report substantially lower values of M gas than what are typically obtained in CObased studies (Scoville et al 2014(Scoville et al , 2016.…”
Section: H2mentioning
confidence: 97%
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“…However, this approach relies on the assumption of a dust-to-gas mass ratio (DGR), which typically depends on the gas metallicity (Bolatto et al 2013;Sandstrom et al 2013;Genzel et al 2015). Recent ALMA results report substantially lower values of M gas than what are typically obtained in CObased studies (Scoville et al 2014(Scoville et al , 2016.…”
Section: H2mentioning
confidence: 97%
“…The tight relation observed between CO(1-0) luminosity and the restframe 850 μm monochromatic luminosity (see Figure 1 in Scoville et al 2016) suggests that a simple conversion factor can be used to derive gas masses from monochromatic dust continuum observations. By setting the dust temperature to = T 25 dust K (following Scoville et al 2014), we derive from Equation (12) in their paper M ISM from our 1 mm flux densities as follows:…”
Section: Co Versus Dust-based Ism Massesmentioning
confidence: 99%
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“…For example, studies of emission line ratios of high-redshift (z>4) galaxies by Spitzer suggest that early galaxies grow at a fast pace, with high specific star formation rates (SFRs) and stellar mass assembly timescales of only a couple of hundred Myr (de Barros et al 2014;Faisst et al 2016a;Jiang et al 2016). A substantially higher gas fraction as well as changes in the ionization parameter of stellar radiation indicated by the [O III]/[O II]line ratio are also observed, indicative of a different H 2 region configuration (Steidel et al 2014;Genzel et al 2015;Silverman et al 2015;Faisst 2016;Masters et al 2016;Scoville et al 2016).…”
Section: Introductionmentioning
confidence: 99%