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Title:
Elemental abundances of the supernova remnant G292.0+1.8: Evidence for a massive progenitor
Authors:
Hughes, John P.; Singh, K. P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 1, p. 126-135 (ApJ Homepage)
Publication Date:
02/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, CHEMICAL COMPOSITION, NONEQUILIBRIUM IONIZATION, NUCLEAR FUSION, SUPERNOVA REMNANTS, X RAY ASTRONOMY, X RAY SPECTRA, EXOSAT SATELLITE, HEAO 2, NUMERICAL ANALYSIS, PROPORTIONAL COUNTERS, X RAY IMAGERY
DOI:
10.1086/173710
Bibliographic Code:
1994ApJ...422..126H

Abstract

We present a comprehensive nonequilibrium ionization (NEI) analysis of X-ray spectral data from the Einstein Observatory and EXOSAT for the supernova remnant G292.0+1.8. The spectra are well described by a single-temperature, single-timescale NEI model with kT = 1.64-0.19+0.29 keV and net = (5.55-1.12+1.2 x 1010s/cu cm, which establishes that this remnant is indeed young and in the ionizing phase of evolution of its X-ray spectrum. We determine the abundances of the elements O, Ne, Mg, Si, S, Ar, and Fe and examine their variation over the allowed range of column density, kT, and net. Numerical calculations of the nucleosynthesis expected for a 25 solar mass progenitor agree best with the fitted abundances; in fact the minimum rms percent difference between this model and the derived abundances is only 15%. From the fitted emission measure and a simple geometric model of the remnant we estimate the mass of X-ray-emitting plasma to be 9.3-6.2+1.19 solar mass, for an assumed distance of 4.8 +/- 1.6 kpc. Additional errors on this mass estimate, from clumping of the ejecta, for example, may be substantial. No evidence was found for a difference in the thermodynamic state of the plasma as a function of elemental composition based on analysis of the individual ionization timescales of the various species. In this sense then, G292.0+1.8 resembles the remnant Cas A (another product of a massive star supernova), while it is different from the remnants of SN 1572 (Tycho) and SN 1006, both of which are believed to be from Type Ia supernovae.

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