Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks

Heidi A. White, David B. Fisher, Norman Murray, Karl Glazebrook, Roberto G. Abraham, Alberto D. Bolatto, Andrew W. Green, Erin Mentuch Cooper, Danail Obreschkow

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Abstract

We present molecular gas-mass estimates for a sample of 13 local galaxies whose kinematic and star-forming properties closely resemble those observed in z approximate to 1.5 main-sequence galaxies. Plateau de Bure observations of the CO[1-0] emission line and Herschel Space Observatory observations of the dust emission both suggest molecular gas-mass fractions of similar to 20%. Moreover, dust emission modeling finds T-dust <30 K, suggesting a cold dust distribution compared to their high infrared luminosity. The gas-mass estimates argue that z similar to 0.1 DYNAMO galaxies not only share similar kinematic properties with high-z disks, but they are also similarly rich in molecular material. Pairing the gas-mass fractions with existing kinematics reveals a linear relationship between f(gas) and sigma/nu(c), consistent with predictions from stability theory of a self-gravitating disk. It thus follows that high gas-velocity dispersions are a natural consequence of large gas fractions. We also find that the systems with the lowest t(dep) (similar to 0.5 Gyr) have the highest ratios of sigma/nu(c) and more pronounced clumps, even at the same high molecular gas fraction.

Original languageEnglish
Article number35
Number of pages11
JournalThe Astrophysical Journal: an international review of astronomy and astronomical physics
Volume846
Issue number1
DOIs
Publication statusPublished - 1 Sep 2017

Cite this

White, H. A., Fisher, D. B., Murray, N., Glazebrook, K., Abraham, R. G., Bolatto, A. D., Green, A. W., Cooper, E. M., & Obreschkow, D. (2017). Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks. The Astrophysical Journal: an international review of astronomy and astronomical physics, 846(1), [35]. https://doi.org/10.3847/1538-4357/aa7fbf