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Date and Time of the Query: 2019-06-17 T20:36:19 PDT
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For refcode 2010ApJ...710L..88T:
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Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...710L..88T A Test of Star Formation Laws in Disk Galaxies Tan, Jonathan C. Abstract. We use observations of the radial profiles of the mass surface density of total, {SIGMA}_ g_, and molecular, {SIGMA}_H2_, gas rotation velocity and star formation rate surface density, {SIGMA}_sfr_, of the molecular dominated regions of 12 disk galaxies from Leroy et al. to test several star formation laws: a "Kennicutt-Schmidt power law," {SIGMA}_sfr_ = A_g_ {SIGMA}^1.5^_ g,2_; a "constant molecular law," {SIGMA}_sfr_ = A_H2_{SIGMA}_H2,2_ the "turbulence-regulated laws" of Krumholz & McKee (KM) and Krumholz, McKee, & Tumlinson (KMT), a "gas-{OMEGA} law," {SIGMA}_sfr_ = B_{OMEGA}_{SIGMA}_ g_{OMEGA} and a shear-driven "giant molecular cloud (GMC) collisions law," {SIGMA}_sfr_ = B_CC_{SIGMA}_ g_{OMEGA}(1 -- 0.7{beta}), where {beta} = d ln v_circ_/d ln r. We find the constant molecular law, KMT turbulence law, and GMC collision law are the most accurate, with an rms error of a factor of 1.5 if the normalization constants are allowed to vary between galaxies. Of these three laws, the GMC collision law does not require a change in physics to account for the full range of star formation activity seen from normal galaxies to circumnuclear starbursts. A single global GMC collision law with B_CC_ = 8.0 x 10^--3^, i.e., a gas consumption time of 20 orbital times for {beta} = 0, yields an rms error of a factor of 1.8. Key words: galaxies: evolution, stars: formation
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