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Resolved Properties of Extragalactic Giant Molecular Clouds
Alberto D. Bolatto, Adam K. Leroy, Erik Rosolowsky +2
Giant molecular clouds (GMCs) are the major reservoirs of molecular gas in galaxies, and the starting point for star formation. As such, their properties play a key role in setting…
The Resolved Properties of Extragalactic Giant Molecular Clouds
Alberto D. Bolatto, Adam K. Leroy, Erik Rosolowsky +2
We use high spatial resolution observations of CO to systematically measure the resolved size-line width, luminosity-line width, luminosity-size, and the mass-luminosity relations…
The Milky Way Rotation Curve and its Vertical Derivatives Inside the Solar Circle
E. S. Levine, Carl Heiles, Leo Blitz
We measure the Galactic rotation curve and its first two vertical derivatives in the first and fourth quadrants of the Milky Way using the 21 cm VGPS and SGPS. We find tangent velo…
The Dense Gas in the Central Kiloparsec of NGC 6946
E. S. Levine, Tamara T. Helfer, R. Meijerink +1
We present observations of the HCN and HCO+ J=1-0 transitions in the center of the nearby spiral galaxy NGC 6946 made with the BIMA and CARMA interferometers. Using the BIMA SONG C…
Extinction in the Large Magellanic Cloud
Nia Imara, Leo Blitz
We present an extinction map of the Large Magellanic Cloud (LMC), using 204,502 stars from the Two Micron All Sky Survey point source catalog. We first use the NICE method to deter…
The Warp and Spiral Arms of the Milky Way
E. S. Levine, Leo Blitz, Carl Heiles +1
We examine the outer Galactic HI disk for deviations from the b=0 plane by constructing maps of disk surface density, mean height, and thickness. We find that the Galactic warp is…
Thermal and non-thermal components of the interstellar medium at sub-kiloparsec scales in galaxies
R. Paladino, M. Murgia, T. T. Helfer +5
Aims: We present new radio continuum observations of ten BIMA SONG galaxies, taken at 1.4 GHz with the Very Large Array. These observations allow us to extend the study of the rela…
The Spiral Structure of the Outer Milky Way in Hydrogen
E. S. Levine, Leo Blitz, Carl Heiles
We produce a detailed map of the perturbed surface density of neutral hydrogen in the outer Milky Way disk demonstrating that the Galaxy is a non-axisymmetric multi-armed spiral. S…
The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
Leo Blitz, Erik Rosolowsky
We show that the ratio of molecular to atomic gas in galaxies is determined by hydrostatic pressure and that the relation between the two is nearly linear. The pressure relation is…
Giant Molecular Clouds in Local Group Galaxies
Leo Blitz, Yasuo Fukui, Akiko Kawamura +3
We present the first comparative study of extragalactic GMCs using complete data sets for entire galaxies and a uniform set of reduction and analysis techniques. We present results…
Molecular Gas in the Low Metallicity, Star Forming Dwarf IC 10
A. Leroy, A. D. Bolatto, F. Walter +1
We present a complete survey of CO 1->0 emission in the Local Group dwarf irregular IC 10. The survey, conducted with the BIMA interferometer, covers the stellar disk and a large f…
The Vertical Structure of the Outer Milky Way HI Disk
E. S. Levine, Leo Blitz, Carl Heiles
We examine the outer Galactic HI disk for deviations from the b=0 plane by constructing maps of disk surface density, mean height, and thickness. We find that the Galactic warp is…
A Magellanic Origin for the Warp of the Galaxy
Martin D. Weinberg, Leo Blitz
We show that a Magellanic Cloud origin for the warp of the Milky Way can explain most quantitative features of the outer HI layer recently identified by Levine, Blitz & Heiles (200…
The Molecular Connection to the FIR-Radio Continuum Correlation in Galaxies
M. Murgia, T. T. Helfer, R. Ekers +4
We have studied the relationships between the radio continuum (RC) and CO emission for a set of galaxies selected from the BIMA Survey of Nearby Galaxies. We find that the global C…
Global Star Formation from z=5e-8 to z=20
Leo Blitz
Starting with the assertion that the problem of isolated, single star formation is essentially solved, this paper examines some of the missing steps needed to go from there to unde…
Giant Molecular Clouds in M64
E. Rosolowsky, L. Blitz
(abridged) We investigate the properties of Giant Molecular Clouds (GMCs) in the molecule-rich galaxy M64 (NGC 4826). In M64, the mean surface density of molecular gas is 2N(H_2) ~…
High-Resolution Measurements of the Halos of Four Dark Matter-Dominated Galaxies: Deviations from a Universal Density Profile
Joshua D. Simon, Alberto D. Bolatto, Adam Leroy +2
We derive rotation curves for four nearby, low-mass spiral galaxies and use them to constrain the shapes of their dark matter density profiles. This analysis is based on high-resol…
The Initial Mass Function of GMCs
Leo Blitz, Erik Rosolowsky
The properties of GMCs in several Local Group galaxies are quantified and compared. It is found that the mass spectrum of GMCs varies from galaxy to galaxy. The variations are sign…
GMC Formation in M33: the Role of Pressure
Leo Blitz, Erik Rosolowsky
We present a complete map of the Giant Molecular Clouds in M33 and show that they lie exclusively on filaments of HI. The GMCs are localized on the extended HI filaments, and HI fi…
The Role of Pressure in GMC Formation
Leo Blitz, Erik Rosolowsky
We examine the hypothesis that hydrostatic pressure alone determines the ratio of atomic to molecular gas averaged over a particular radius in disk galaxies. The hypothesis implies…
A Search for Kinematic Evidence of Radial Gas Flows in Spiral Galaxies
Tony Wong, Leo Blitz, Albert Bosma
CO and HI velocity fields of seven nearby spiral galaxies, derived from radio-interferometric observations, are decomposed into Fourier components whose radial variation is used to…
Molecular Gas in Nearby Dwarf Galaxies: Single Dish and Interferometric Results
Alberto D. Bolatto, Adam Leroy, Josh D. Simon +2
We present results from an extensive survey of molecular gas in nearby dwarf galaxies. This survey consists of a single-dish search for CO emission at the UASO Kitt Peak 12m telesc…
Dark Matter in Dwarf Galaxies: Latest Density Profile Results
Joshua D. Simon, Alberto D. Bolatto, Adam Leroy +1
We present high-resolution two-dimensional velocity fields in Halpha and CO of the nearby dwarf galaxy NGC 2976. Our observations were made at both higher spatial resolution (~75 p…
Dark Matter in Dwarf Galaxies: The First Dark Galaxy?
Joshua D. Simon, Timothy Robishaw, Leo Blitz
We present new HI observations of the high-velocity cloud (HVC) that we resolved near the Local Group dwarf galaxy LGS 3. The cloud is rotating, with an implied mass that makes it…