Analysis of X-ray spectra reveals possibility of enhanced silicon in three supernova remnants
New calculations by Tucker and Koren for X-radiation from a thin hot plasma are applied to observed X-ray spectra of the Cygnus Loop, Vela X, and Puppis A. These calculations cannot satisfactorily describe the spectra of these three old supernova remnants when evaluated at one temperature and for commonly accepted cosmic abundances. However, all of the data are fitted when just two abundance values are changed: an increase in silicon by a factor of approximately 10, and a factor of 5 less iron. This modified set of abundances substituted into Tucker and Koren's model agrees with recent optical coronal line observations in the Cygnus Loop and explains spectra from recent observations of the supernova remnants Cas A and Tycho. It is remarkable that this thermal model with modified abundances fits the spectra of all these objects.
- Research Organization:
- Lawrence Livermore Laboratory, University of California, Livermore
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-003762
- OSTI ID:
- 4150718
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Vol. 200; ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
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