Computer Science
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3266n&link_type=abstract
Spitzer Proposal ID #3266
Computer Science
Scientific paper
We propose to carry out Spitzer/IRS observations of the interaction of a supernova with a molecular cloud. Using the Short-Lo, Short-Hi, and Long-Hi modes of IRS, we will perform spectral-line mapping over the entire IRS bandpass (5.3 - 37 micron) of a roughly 1 x 1 arcmin region in each of four supernova remnants: IC443 (clump C), 3C391, W28, and W44. The proposed observations will yield maps of the S(0) - S(7) pure rotational emissions from molecular hydrogen, several rotational emissions from water vapor, and fine structure emissions from FeI, FeII, SI, and SiII. Because the target transitions are either completely inaccessible from the ground and/or to weak to be mapped by warm telescopes, only Spitzer can perform the required observations. We will thereby compare the spatial distribution of warm molecular hydrogen and water vapor behind slow, non-dissociative molecular shocks with that of ionized iron and silicon behind faster, dissociative shocks. These observations will be critical because they will (1) elucidate the spatial relationship between the dissociative and non-dissociative shocks; (2) constrain the shock parameters in the different shock components, thereby allowing the ram pressures in the various shock components to be compared; and (3) allow the post-shock water abundance to be determined more reliably than has been possible to date, revealing the extent of ice destruction within the non-dissociative shock. The Spitzer observations proposed here will provide a critical test of fundamental modifications that we have proposed to the standard theory of molecular shock waves - involving the irradiation of slow molecular shocks by the ultraviolet radiation emitted by nearby fast shocks - in order to explain the anomalously low water vapor abundances observed recently in IC443.
Bergin Edwin
Hollenbach David
Kaufman Michael
Melnick G. G.
Neufeld David
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