skip to main content

Title: CARMA SURVEY TOWARD INFRARED-BRIGHT NEARBY GALAXIES (STING). III. THE DEPENDENCE OF ATOMIC AND MOLECULAR GAS SURFACE DENSITIES ON GALAXY PROPERTIES

We investigate the correlation between CO and H I emission in 18 nearby galaxies from the CARMA Survey Toward IR-Bright Nearby Galaxies (STING) at sub-kpc and kpc scales. Our sample, spanning a wide range in stellar mass and metallicity, reveals evidence for a metallicity dependence of the H I column density measured in regions exhibiting CO emission. Such a dependence is predicted by the equilibrium model of McKee and Krumholz, which balances H{sub 2} formation and dissociation. The observed H I column density is often smaller than predicted by the model, an effect we attribute to unresolved clumping, although values close to the model prediction are also seen. We do not observe H I column densities much larger than predicted, as might be expected were there a diffuse H I component that did not contribute to H{sub 2} shielding. We also find that the H{sub 2} column density inferred from CO correlates strongly with the stellar surface density, suggesting that the local supply of molecular gas is tightly regulated by the stellar disk.
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9]
  1. Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States)
  2. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
  3. National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
  4. Department of Astronomy, University of California, Berkeley, CA 94720 (United States)
  5. Department of Physics, University of Alberta, Edmonton, AB T6G 2E1 (Canada)
  6. Institut für theoretische Astrophysik, Zentrum für Astronomie der Universität Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany)
  7. National Radio Astronomy Observatory, Socorro, NM 87801 (United States)
  8. Department of Physics, C1 Lab 140, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006 (South Africa)
  9. Max-Planck-Institut für Astronomie, Konigstuhl 17, D-69117 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
22215398
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 777; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATOMS; AVAILABILITY; CARBON MONOXIDE; DISSOCIATION; EMISSION; GALAXIES; HYDROGEN; MOLECULES