Other
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop..533f&link_type=abstract
Spitzer Proposal ID #533
Other
Scientific paper
Over 400 diffuse emission bubbles have been identified at 24 microns from visual inspection of the MIPSGAL Legacy Survey (Carey et al. 2009) mosaic images. These small (< 1 arcminute) rings, bubbles, disks or shells are pervasive through the entire Galactic plane in the mid-infrared. Their distribution is approximately uniform in Galactic latitude and longitude, and the average density is found to be around 1.5 bubbles per square degree. Analysis of GLIMPSE 3.6 to 8.0 microns and MIPSGAL 70 microns images indicates that a large majority of these objects are only detected at 24 microns. The usual suspects for these "bubbles" are some type of evolved stars (PNe, SNRs, WR, AGB ...). Extensive browsing of available catalogs have allowed us to identify less than 10% of these objects. The majority of the already known "bubbles" were found to be PNe. Three SNRs and one post-AGB star were also identified. Therefore, about 90% of the objects within our catalog are new discoveries. Very recent Spitzer/IRS low-resolution observations of two objects analog to our "bubbles" have provided us with a new perspective. They both show dust-free, highly-ionized-gas-rich spectra. While these two spectra share some striking characteristics, they are like nothing published before and they also exhibit significant differences between each other in terms of ionized gas line ratios. One of these objects has been suggested to be a distant dust-free young surpernova remnant. Whatever the nature of these 24 microns sources are, the implications of such a large number in the Galactic plane is profound. This project has a high discovery potential, particularly if a majority of these "bubbles" are dust-free SNRs. We propose IRS high-resolution observations of a selected subsample of 21 "bubbles" in order to determine their physical nature. This survey of a statistically representative number of objects is the only way to glean information on the ensemble. Spitzer/IRS is the only instrument in the near future that is capable of probing the very
Billot Nicolas
Carey Sean
Flagey Nicolas
Hora Joe
Kraemer Kathleen
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