The Role of Pressure in GMC Formation

Abstract

We examine the hypothesis that hydrostatic pressure alone determines the ratio of atomic to molecular gas averaged over a particular radius in disk galaxies. The hypothesis implies that the transition radius, the location where the ratio is unity, should always occur at the same value of stellar surface density in all galaxies. We examine data for 28 galaxies and find that the stellar surface density at the transition radius is indeed constant to 40% at a value of 120 M_sun/pc^2. If the hypothesis can be confirmed at all radii within a large range of galaxy types and metallicities, combining it with the observed constancy of the star formation rate with H_2 surface density may enable a physically motivated star formation prescription with wide applicability.

arXiv comment4 pages, 1 Figure, Accepted to ApJ Letters

References in corpus (9)

• Stellar mass-to-light ratios and the Tully-Fisher relation
• The Relationship Between Gas Content and Star Formation in Molecule-Rich Spiral Galaxies
• The BIMA Survey of Nearby Galaxies (BIMA SONG). II. The CO Data
• Giant Molecular Clouds in M33 - I. BIMA All Disk Survey
• The Molecular Gas Distribution and Schmidt Law in M33
• The Vertical Distribution and Kinematics of HI and Mass Models of the Galactic Disk
• Deep CCD Surface Photometry of the Edge-On Spiral NGC 4244
• Origin of Radially Increasing Stellar Scaleheight in a Galactic Disk
• Radio continuum and CO emission in star-forming galaxies

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