Massive Star Forming Regions in the Galaxy using the Spitzer GLIMPSE Survey

Abstract

We examine the thirteen most luminous sources in the WMAP free-free map using the Spitzer GLIMPSE and MSX surveys to identify massive star formation regions, emitting one-third of the Galactic free-free luminosity. We identify star forming regions by a combination of bubble morphology in 8 $\micronm$ (PAH) emission and radio recombination line radial velocities. We find 40 star forming regions associated with our WMAP sources, and determine unique distances to 31. We interpret the bubbles as evidence for radial expansion. The radial velocity distribution for each source allows us to measure the intrinsic speed of a region's expansion. This speed is consistent with the size and age of the bubbles. The high free-free luminosities, combined with negligible synchrotron emission, demonstrate that the bubbles are not driven by supernovae. The kinetic energy of the largest bubbles is a substantial fraction of that measured in the older superbubbles found by Heiles. We find that the energy injected into the ISM by our bubbles is similar to that required to maintain the turbulent motion in the gas disk inside 8 kpc. We report a number of new star forming regions powered by massive ($\textrm{M}_{*} > 10^4 \textrm{M}_\sun$) star clusters. We measure the scale height of the Galactic O stars to be $h_{\textrm{*}} = 35 \pm 5 \pc$. We determine an empirical relationship between the PAH and free-free emission of the form $F_{\text{PAH}}\propto F_{\text{ff}}^2$. Finally, we find that the bubble geometry is more consistent with a spherical shell rather than a flattened disk.

Submitted to ApJ; 29 Pages, 17 Figures, 5 Tables

References in corpus (42)

• Control of star formation by supersonic turbulence
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission
• The Calibration of Mid-Infrared Star Formation Rate Indicators
• Kinetic Energy Decay Rates of Supersonic and Super-Alfvenic Turbulence in Star-Forming Clouds
• First GLIMPSE Results on the Stellar Structure of the Galaxy
• HST/NICMOS Observations of Massive Stellar Clusters Near the Galactic Center
• UBVJHK synthetic photometry of Galactic O stars
• On the massive stellar population of the Super Star Cluster Westerlund 1
• Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: II. The Molecular Gas Disk
• A general catalogue of 6.7 GHz methanol masers. I: data
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Galactic Foreground Emission
• From Massive Protostars to a Giant HII Region: Submillimeter Imaging of the Galactic Mini-starburst W43
• A massive cluster of Red Supergiants at the base of the Scutum-Crux arm
• Star Formation in Massive Clusters via the Wilkinson Microwave Anisotropy Probe and the Spitzer Glimpse Survey
• Discovery of an Extraordinarily Massive Cluster of Red Supergiants
• Molecular Rings and the Thickness of Star-Forming Clouds
• Radio Continuum and Recombination Line Study of UC HII Regions with Extended Envelopes
• Trigonometric Parallaxes of Massive Star Forming Regions: III. G59.7+0.1 and W 51 IRS2
• The Stellar Content of Obscured Galactic Giant H II Regions
• One Dimensional Dynamical Models of the Carina Nebula Bubble
• Radio Recombination Lines in Galactic HII Regions
• Resolution of Distance Ambiguities of Inner Galaxy Massive Star Formation Regions II
• A third red supergiant rich cluster in the Scutum-Crux Arm
• The Connection between W31, SGR 1806-20, & LBV 1806-20: Distance, Extinction, and Structure
• The Massive Star Content of NGC 3603
• The Vertical Equilibrium of Molecular Gas in the Galactic Disk
• The Stellar Content of Obscured Galactic Giant H II Regions: II. W42
• The Distances of SNR W41 and overlapping HII regions
• The Distance of the Soft Gamma Repeater SGR 1806-20
• MSX Mid infrared imaging of massive star birth environments. II: Giant HII regions
• Infrared Observations of the Candidate LBV 1806-20 & Nearby Cluster Stars
• High Resolution X-ray Observations of the Pulsar Wind Nebula Associated with the Gamma-ray Source HESSJ1640-465
• An X-ray Imaging Study of the Stellar Population in RCW49
• A Luminous Companion to SGR 1806-20
• OB Stars in the Solar Neighborhood I: Analysis of their Spatial Distribution
• Embedded Young Stellar Object Candidates in the Active Star Forming Complex W51: Mass Function and Spatial Distribution
• Radio Monitoring and High Resolution Observations of the Soft Gamma Ray Repeater 1806-20. by Vasisht et al. Postscript file, 13 pages
• Revealing the environs of the remarkable southern hot core G327.3-0.6
• Gemini Mid-Infrared Imaging of Massive Young Stellar Objects in NGC 3576
• Interaction between Ionized and Molecular Gas in the Active Star-Forming Region W31
• Evidence of triggered star formation in G327.3-0.6. Dust-continuum mapping of an infrared dark cloud with P-ArTéMiS

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