Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0306119)
· On-line Data
· References in the article
· Citations to the Article (48) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
On the Determination of Ejecta Structure and Explosion Asymmetry from the X-Ray Knots of Cassiopeia A
Authors:
Laming, J. Martin; Hwang, Una
Affiliation:
AA(Code 7674L, Naval Research Laboratory, Washington, DC 20375; .), AB(Goddard Space Flight Center and University of Maryland; .)
Publication:
The Astrophysical Journal, Volume 597, Issue 1, pp. 347-361. (ApJ Homepage)
Publication Date:
11/2003
Origin:
UCP
ApJ Keywords:
Hydrodynamics, ISM: Individual: Name: Cassiopeia A, ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/378268
Bibliographic Code:
2003ApJ...597..347L

Abstract

We present a detailed analysis of Chandra X-ray spectra from individual ejecta knots in the supernova remnant Cassiopeia A. The spectra are fitted to give the electron temperature Te and (single) ionization age net. These quantities are compared with the predictions of self-similar hydrodynamic models incorporating time-dependent ionization and radiation losses and Coulomb electron-ion equilibration behind the reverse shock for a variety of different ejecta density profiles described by a uniform-density core and a power-law envelope. We find that the ejecta close to the ``jet'' region in the northeast, but not actually in the jet itself, have a systematically shallower outer envelope than ejecta elsewhere in the remnant, and we interpret this as being due to more energy of the initial explosion being directed in this polar direction as opposed to equatorially. The degree of asymmetry we infer is at the low end of that generally modeled in asymmetric core-collapse simulations and may possibly be used to rule out highly asymmetric explosion models.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints