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A high-dispersion molecular gas component in nearby galaxies
Anahi Caldu-Primo, Andreas Schruba, Fabian Walter +5
We present a comprehensive study of the velocity dispersion of the atomic (HI) and molecular (H2) gas components in the disks (R < R25) of a sample of 12 nearby spiral galaxies wit…
Clumping and the Interpretation of kpc-Scale Maps of the Interstellar Medium: Smooth HI and Clumpy, Variable H2 Surface Density
Adam K. Leroy, Cheoljong Lee, Andreas Schruba +6
Many recent models consider the structure of individual interstellar medium (ISM) clouds as a way to explain observations of large parts of galaxies. To compare such models to obse…
Molecular Gas and Star Formation in Nearby Disk Galaxies
Adam K. Leroy, Fabian Walter, Karin Sandstrom +12
We compare molecular gas traced by 12CO(2-1) maps from the HERACLES survey, with tracers of the recent star formation rate (SFR) across 30 nearby disk galaxies. We demonstrate a fi…
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…
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…
Outside-in Shrinking of the Star-forming Disk of Dwarf Irregular Galaxies
Hong-Xin Zhang, Deidre A. Hunter, Bruce G. Elmegreen +2
We have studied multi-band surface brightness profiles of a representative sample of 34 nearby dwarf irregular galaxies (dIrrs). Our data include GALEX FUV/NUV, UBV, Hα, and Spitze…
A Molecular Star Formation Law in the Atomic Gas Dominated Regime in Nearby Galaxies
Andreas Schruba, Adam K. Leroy, Fabian Walter +11
We use the IRAM HERACLES survey to study CO emission from 33 nearby spiral galaxies down to very low intensities. Using atomic hydrogen (HI) data, mostly from THINGS, we predict th…
A Constant Molecular Gas Depletion Time in Nearby Disk Galaxies
F. Bigiel, A. K. Leroy, F. Walter +8
We combine new sensitive, wide-field CO data from the HERACLES survey with ultraviolet and infrared data from GALEX and Spitzer to compare the surface densities of H2, Sigma_H2, an…
The Scale Dependence of the Molecular Gas Depletion Time in M33
Andreas Schruba, Adam K. Leroy, Fabian Walter +2
We study the Local Group spiral galaxy M33 to investigate how the observed scaling between the (kpc-averaged) surface density of molecular gas (Σ_H2) and recent star formation rate…