Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mwac.meet..p13x&link_type=abstract
Midwest Astrochemistry Meeting 2011, held 21-22 October at the University of Illinois at Urbana-Champaign. http://midwest.astroc
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a detailed comparison of molecular and atomic gas distributions in 18 nearby galaxies at sub-kpc or kpc scales, based on the CO J = 1 - 0 data from the CARMA Survey Toward IR-Bright Nearby Galaxies (STING) and the HI 21cm data in the NRAO Very Large Array (VLA) archive. The observation spatial coverage extends to a quarter of the optical radius for each galaxy. The average molecular and atomic gas column density sensitivities are ~8M&sun;/pc2 and ~3M&sun;/pc2 at the comparison resolution. A metallicity dependence of the HI saturation limit was possibly detected in the galaxy sample ( 8.1<12+Log(O/H)<9.0 ). We used the CO and HI pixel-by-pixel comparison results to test models of the atomic-to-molecular transition and CO formation at different metallicities. An acceptable agreement was found at the limited spatial resolutions and sensitivities of the observational datasets.
Wong Tony
Xue Rongrong
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