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Dust Formation Observed in Young Supernova Remnants with Spitzer

Rho, J. and Reach, W. T. and Tappe, A. and Rudnick, L. and Kozasa, T. and Hwang, U. and Andersen, M. and Gomez, H. and DeLaney, T. and Dunne, L. and Slavin, J. (2009) Dust Formation Observed in Young Supernova Remnants with Spitzer. In: Cosmic Dust--Near and Far. ASP Conference Series. No.414. Astronomical Society of the Pacific , San Francisco, CA, pp. 22-35. ISBN 9781583817087.

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We present dust features and masses observed in young supernova remnants (SNRs) with Spitzer Infrared Spectrograph (IRS) mapping and staring observations of four youngest supernova remnants: SNR 1E102.2-7219 (E0102) in the Small Magellanic Cloud (SMC), Cas A and G11.2-0.3 in our Galaxy, and N132D in the Large Magellanic Cloud (LMC). The spectral mapping data revealed a number of dust features which include 21 micron-peak dust and featureless dust in Cas A and 18-micron peak dust in E0102 and N132D. The 18 micron-peak feature is fitted by a mix of MgSiO_3 and solid Si dust grains, while the 21-micron peak dust is by a mix of silicates and FeO; we also explore dust fitting using Continuous Distribution of Ellipsoid grain models. We report detection of CO fundamental band from Cas A in near-infrared. We review dust features observed and identified in other SNRs. The dust emission is spatially correlated with the ejecta emission, showing dust is formed in SN ejecta. The spectra of E0102 show rich gas lines from ejecta including strong ejecta lines of Ne and O, including two [Ne III] lines and two [Ne V] lines which allow us to diagnostic density and temperature of the ejecta and measure the ejecta masses. E0102 and N132D show weak or lacking Ar, Si, and Fe ejecta, whereas the young Galactic SNR Cas A show strong Ar, Si, and S and weak Fe. We discuss compositions and masses of dust and association with those of ejecta and finally, dust contribution from SNe to early Universe.

Item Type:Book Section
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Reach, W. T.0000-0001-8362-4094
Additional Information:© 2009 Astronomical Society of the Pacific. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology. Support for this work was provided by NASA and through LTSA grant NRA-01-01-LTSA-013 and Spitzer GO awards issued by JPL/Caltech.
Funding AgencyGrant Number
Spitzer Science CenterUNSPECIFIED
Subject Keywords:Cosmic dust
Series Name:ASP Conference Series
Issue or Number:414
Record Number:CaltechAUTHORS:20110105-082958088
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21593
Deposited By: Tony Diaz
Deposited On:25 Jan 2011 17:31
Last Modified:03 Oct 2019 02:26

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