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Date and Time of the Query: 2019-06-25 T10:54:09 PDT
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For refcode 2012ApJ...745..183R:
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2012ApJ...745..183R CARMA Survey Toward Infrared-bright Nearby Galaxies (STING). II. Molecular Gas Star Formation Law and Depletion Time across the Blue Sequence Rahman, Nurur; Bolatto, Alberto D.; Xue, Rui; Wong, Tony; Leroy, Adam K.; Walter, Fabian; Bigiel, Frank; Rosolowsky, Erik; Fisher, David B.; Vogel, Stuart N.; Blitz, Leo; West, Andrew A.; Ott, Jurgen Abstract. We present an analysis of the relationship between molecular gas and current star formation rate surface density at sub-kiloparsec and kiloparsec scales in a sample of 14 nearby star-forming galaxies. Measuring the relationship in the bright, high molecular gas surface density ({SIGMA}_H_2_ >~ 20 M_sun_ pc^-2^) regions of the disks to minimize the contribution from diffuse extended emission, we find an approximately linear relation between molecular gas and star formation rate surface density, N_mol_ ~ 0.96 +/- 0.16, with a molecular gas depletion time, {tau}^mol^_dep_ ~ 2.30 +/- 1.32 Gyr. We show that in the molecular regions of our galaxies there are no clear correlations between {tau}^mol^_dep_ and the free-fall and effective Jeans dynamical times throughout the sample. We do not find strong trends in the power-law index of the spatially resolved molecular gas star formation law or the molecular gas depletion time across the range of galactic stellar masses sampled (M_*_ ~ 10^9.7^-10^11.5^ M_sun_). There is a trend, however, in global measurements that is particularly marked for low-mass galaxies. We suggest that this trend is probably due to the low surface brightness CO J = 1-0, and it is likely associated with changes in CO-to-H_2_ conversion factor. Key words: galaxies: general, galaxies: ISM, galaxies: spiral, galaxies: star formation, ISM: molecules
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