Andersen, M. and Rho, J. and Reach, W. T. and Hewitt, J. W. and Bernard, J. P. (2011) Dust Processing in Supernova Remnants: Spitzer Mips Spectral Energy Distribution and Infrared Spectrograph Observations. Astrophysical Journal, 742 (1). Art. No. 7. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20111205-114415367
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We present Spitzer Multiband Imaging Photometer (MIPS) spectral energy distribution (SED) and Infrared Spectrograph (IRS) observations of 14 Galactic supernova remnants (SNRs) previously identified in the GLIMPSE survey. We find evidence for SNR/molecular cloud interaction through detection of [O I] emission, ionic lines, and emission from molecular hydrogen. Through blackbody fitting of the MIPS SEDs we find the large grains to be warm, 29-66 K. The dust emission is modeled using the DUSTEM code and a three-component dust model composed of populations of big grains (BGs), very small grains (VSGs), and polycyclic aromatic hydrocarbons. We find the dust to be moderately heated, typically by 30-100 times the interstellar radiation field. The source of the radiation is likely hydrogen recombination, where the excitation of hydrogen occurred in the shock front. The ratio of VSGs to BGs is found for most of the molecular interacting SNRs to be higher than that found in the plane of the Milky Way, typically by a factor of 2-3. We suggest that dust shattering is responsible for the relative overabundance of small grains, in agreement with the prediction from dust destruction models. However, two of the SNRs are best fitted with a very low abundance of carbon grains to silicate grains and with a very high radiation field. A likely reason for the low abundance of small carbon grains is sputtering. We find evidence for silicate emission at 20 μm in their SEDs, indicating that they are young SNRs based on the strong radiation field necessary to reproduce the observed SEDs.
|Additional Information:||© 2011 The American Astronomical Society. Received 2010 April 12; accepted 2011 September 26; published 2011 November 1. We thank the anonymous referee for careful reading and insightful comments which helped to improve the paper. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Partial support for this work was provided by both a NASA Spitzer GO award issued by JPL/Caltech and an LTSA grant NRA-01-01-LTSA-013. The DUSTEM code is available from http://www.ias.u-psud.fr/DUSTEM/.|
|Subject Keywords:||dust, extinction; ISM: supernova remnants|
|Official Citation:||Dust Processing in Supernova Remnants: Spitzer MIPS Spectral Energy Distribution and Infrared Spectrograph Observations M. Andersen et al. 2011 ApJ 742 7|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||05 Dec 2011 21:03|
|Last Modified:||26 Dec 2012 14:34|
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