Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50447s&link_type=abstract
Spitzer Proposal ID #50447
Physics
Scientific paper
Recent modeling of Chandra and Spitzer data from the supernova remnant Kes 75 reveals shock-heated circumstellar and ejecta material in X-rays along with infrared emission that constrains the amount of dust in the ambient material. Our results show a dust-to-gas mass ratio that is much smaller than values typically assumed for the Milky Way. This is consistent with similar results from studies of LMC remnants, although the cause of this apparent dust depletion is not currently understood. Our constraints for Kes 75 are limited by our very imprecise knowledge of the dust spectrum. Here we propose short IRS observations to obtain spectra from the limbs of Kes 75 in order to derive the dust emission properties and determine the total dust mass. Our observations will also be sensitive to faint line emission that may be produced by the shocked SNR gas, potentially providing measurements of the thermodynamic state of the IR-emitting gas, and constraining the abundance of Fe in the ejecta.
Gaensler Bryan
Morton Timothy
Reynolds Stephen
Slane Patrick
Temim Tea
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