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

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 ≈ 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 ∼20%. Moreover, dust emission modeling finds T {sub dust} < 30 K, suggesting a cold dust distribution compared to their high infrared luminosity. The gas-mass estimates argue that z ∼ 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 {sub gas} and σ / v {sub 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 {sub dep} (∼0.5 Gyr) have the highest ratios of σ / v{sub c} and more pronounced clumps, even at the same high molecular gas fraction.

Authors:
;  [1]; ;  [2];  [3];  [4];  [5];  [6];  [7]
  1. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON, M5S 3H8 (Canada)
  2. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122 (Australia)
  3. Canadian Institute for Theoretical Astrophysics, 60 St. George Street, University of Toronto, Toronto ON M5S 3H8 (Canada)
  4. Department of Astronomy and Joint Space Institute, University of Maryland, College Park, MD 20642 (United States)
  5. Australian Astronomical Observatory, P.O. Box 970, North Ryde, NSW 1670 (Australia)
  6. Astronomy Department, University of Texas at Austin, Austin, TX 78712 (United States)
  7. International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, M468, Crawley, WA 6009 (Australia)
Publication Date:
OSTI Identifier:
22663187
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; COSMIC DUST; COSMIC GASES; DISPERSIONS; DISTRIBUTION; EMISSION; FORECASTING; LUMINOSITY; MASS; MILKY WAY; MOLECULES; SIMULATION; SPACE; STAR EVOLUTION; STARS; VELOCITY

Citation Formats

White, Heidi A., Abraham, Roberto G., Fisher, David B., Glazebrook, Karl, Murray, Norman, Bolatto, Alberto D., Green, Andrew W., Mentuch Cooper, Erin, and Obreschkow, Danail. Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7FBF.
White, Heidi A., Abraham, Roberto G., Fisher, David B., Glazebrook, Karl, Murray, Norman, Bolatto, Alberto D., Green, Andrew W., Mentuch Cooper, Erin, & Obreschkow, Danail. Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks. United States. doi:10.3847/1538-4357/AA7FBF.
White, Heidi A., Abraham, Roberto G., Fisher, David B., Glazebrook, Karl, Murray, Norman, Bolatto, Alberto D., Green, Andrew W., Mentuch Cooper, Erin, and Obreschkow, Danail. Fri . "Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks". United States. doi:10.3847/1538-4357/AA7FBF.
@article{osti_22663187,
title = {Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks},
author = {White, Heidi A. and Abraham, Roberto G. and Fisher, David B. and Glazebrook, Karl and Murray, Norman and Bolatto, Alberto D. and Green, Andrew W. and Mentuch Cooper, Erin and Obreschkow, Danail},
abstractNote = {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 ≈ 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 ∼20%. Moreover, dust emission modeling finds T {sub dust} < 30 K, suggesting a cold dust distribution compared to their high infrared luminosity. The gas-mass estimates argue that z ∼ 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 {sub gas} and σ / v {sub 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 {sub dep} (∼0.5 Gyr) have the highest ratios of σ / v{sub c} and more pronounced clumps, even at the same high molecular gas fraction.},
doi = {10.3847/1538-4357/AA7FBF},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}