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Date and Time of the Query: 2019-05-19 T06:19:30 PDT
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For refcode 2016AJ....152..157L:
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2016AJ....152..157L SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves Lelli, Federico; McGaugh, Stacy S.; Schombert, James M. Abstract. We introduce SPARC (Spitzer Photometry and Accurate Rotation Curves): a sample of 175 nearby galaxies with new surface photometry at 3.6 micron and high-quality rotation curves from previous H I/Halpha studies. SPARC spans a broad range of morphologies (S0 to Irr), luminosities (~5 dex), and surface brightnesses (~4 dex). We derive [3.6] surface photometry and study structural relations of stellar and gas disks. We find that both the stellar mass--H I mass relation and the stellar radius--H I radius relation have significant intrinsic scatter, while the H I mass--radius relation is extremely tight. We build detailed mass models and quantify the ratio of baryonic to observed velocity (V_bar_/V_obs_) for different characteristic radii and values of the stellar mass-to-light ratio (Upsilon_*_) at [3.6]. Assuming Upsilon_*_ ~= 0.5 M_sun_/L_sun_ (as suggested by stellar population models), we find that (i) the gas fraction linearly correlates with total luminosity (II) the transition from star-dominated to gas-dominated galaxies roughly corresponds to the transition from spiral galaxies to dwarf irregulars, in line with density wave theory; and (III) V_bar_/V_obs_ varies with luminosity and surface brightness: high-mass, high-surface-brightness galaxies are nearly maximal, while low-mass, low-surface-brightness galaxies are submaximal. These basic properties are lost for low values of Upsilon_*_ ~= 0.2 M_sun_/L_sun_ as suggested by the DiskMass survey. The mean maximum-disk limit in bright galaxies is Upsilon_*_ ~= 0.7 M_sun_/L_sun_ at [3.6]. The SPARC data are publicly available and represent an ideal test bed for models of galaxy formation. Key words: dark matter, galaxies: dwarf, galaxies: irregular, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure
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