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Physical processes and infrared emission from the Cassiopeia A supernova remnantIRAS 12-100 micron data on the Cas A remnant are presented, and various physical mechanisms and astrophysical sites that may contribute to the observed infrared emission are analyzed. The contributions of various sources of infrared emission to the IRAS fluxes are found to be small. The residual infrared emission is attributed to thermal emission from dust which is swept up by the expanding supernova blast wave and collisionally heated by the postshock X-ray emitting gas. The calculations are consistent with a shock velocity of 1800 km/s and a preshock gas density of about 2/cu cm. The mass of the swept-up gas is about 0.6 solar mass. An excess of 12 micron thermal emission in the spectrum of Cas A suggests the presence of very small particles in the preshocked gas.
Document ID
19870062192
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dwek, E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hauser, M. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dinerstein, H. L.
(Texas, University Austin, United States)
Gillett, F. C.
(Kitt Peak National Observatory Tucson, AZ, United States)
Rice, W. L.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
April 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 315
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A49466
Distribution Limits
Public
Copyright
Other

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