Bubbles in the Galactic Plane

Details Bubbles in the Galactic Plane Bubbles in the Galactic Plane

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530105f&link_type=abstract

American Astronomical Society, AAS Meeting #215, #301.05; Bulletin of the American Astronomical Society, Vol. 42, p.297

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a catalog of compact sources detected in the Spitzer/MIPSGAL 24 microns survey data. These small (< 1 arcminute) rings, bubbles, disks or shells are pervasive through the entire Galactic plane in the mid-infrared. Over 400 such sources are detected from visual inspection of the MIPSGAL mosaic images. Their average density is found to be around 1.5 bubbles per square degree.
We identify 10% of these objects by extensive cross matching with available catalogs. We find that the majority are planetary nebulae, with several additional supernova remnants, post-AGB star, Wolf-Rayet and Luminous Blue Variables. The remaining 90% of the bubbles are yet unknown objects. Most of them are detected at 24 microns but neither at 8 nor 70 microns.
We also present Spitzer/IRS high-resolution spectroscopic observations of 4 objects obtained as part of the Director's Discretionary Time Program. Their spectra show significant variations in the low to high excitation gas lines ratio, as well as in the dust continuum intensity, suggesting some are dust free objects. We compare these spectroscopic data to templates of evolved stars, including PNe, SNRs and extremely rare and massive luminous blue variables to constrain their true nature.

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