Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50322r&link_type=abstract
Spitzer Proposal ID #50322
Other
Scientific paper
The interfaces where supernova remnant shocks encounter molecular clouds are of great interest for the complex processing of the interstellar medium that occurs within them. They are also thought to be the sites of relativistic particle acceleration. Observations of these regions have been obtained previously with both ISO and Spitzer. However, in these examples, the geometry of the interface results in the various shock layers being projected onto each other on the sky (and onto the supernova remnant itself). We have identified such an interface at the northern edge of Cas A, but in this case the interface lies along the sky and the various layers - in situ accelerated electrons (synchrotron emission), thermal emission by dust (24 microns) and molecular gas (CO) are well resolved and separated from each other on the sky. We propose to scan across this region taking IRS high resolution spectra. We expect to map out the distribution of high- and low-ionization potential fine structure lines, thought to map shock regions of high and moderate velocity, as well as tracing molecular hydrogen in the low velocity shocks into the molecular cloud itself. We can also determine where and under what conditions the dust is destroyed in this interface. These observations will test shock models in a unique way, possible only in this unique observing situation.
Kim Yeunjin
Krause Oliver
Rieke George
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