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The CO-to-H2 Conversion Factor and Dust-to-Gas Ratio on Kiloparsec Scales in Nearby Galaxies
K. M. Sandstrom, A. K. Leroy, F. Walter +42
We present kiloparsec (kpc) spatial resolution maps of the CO-to-H2 conversion factor (alpha_co) and dust-to-gas ratio (DGR) in 26 nearby, star-forming galaxies. We have simultaneo…
Evidence for a non-universal Kennicutt-Schmidt relationship using hierarchical Bayesian linear regression
Rahul Shetty, Brandon C. Kelly, Frank Bigiel
For investigating the relationship between the star formation rate and gas surface density, we develop a Bayesian linear regression method that rigorously treats measurement uncert…
A Universal Neutral Gas Profile for Nearby Disk Galaxies
F. Bigiel, L. Blitz
Based on sensitive CO measurements from HERACLES and HI data from THINGS, we show that the azimuthally averaged radial distribution of the neutral gas surface density (Sigma_HI + S…
Low CO Luminosities in Dwarf Galaxies
Andreas Schruba, Adam K. Leroy, Fabian Walter +10
[Abridged] We present maps of CO 2-1 emission covering the entire star-forming disks of 16 nearby dwarf galaxies observed by the IRAM HERACLES survey. The data have 13 arcsec angul…
Estimating the Star Formation Rate at 1 kpc Scales in Nearby Galaxies
Adam K. Leroy, Frank Bigiel, W. J. G. de Blok +9
Using combinations of Hα, ultraviolet (UV), and infrared (IR) emission, we estimate the star formation rate (SFR) surface density, Σ_SFR, at 1 kpc resolution for 30 disk galaxies t…
On the Origin of the Supergiant HI Shell and Putative Companion in NGC 6822
John M. Cannon, Erin M. O'Leary, Daniel R. Weisz +6
We present new Hubble Space Telescope Advanced Camera for Surveys imaging of six positions spanning 5.8 kpc of the HI major axis of the Local Group dIrr NGC 6822, including both th…