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Title:
ASCA Observations of the Composite Supernova Remnant G29.7-0.3
Authors:
Blanton, Elizabeth L.; Helfand, David J.
Publication:
Astrophysical Journal v.470, p.961 (ApJ Homepage)
Publication Date:
10/1996
Origin:
APJ
ApJ Keywords:
ISM: SUPERNOVA REMNANTS, ISM: INDIVIDUAL ALPHANUMERIC: G29.7-0.3, X-RAYS: ISM
DOI:
10.1086/177922
Bibliographic Code:
1996ApJ...470..961B

Abstract

We confirm the composite nature of the supernova remnant (SNR) G29.7-0.3 (Kes 75) using observations in the 0.5-8 keV energy range obtained with the ASCA X-ray observatory. Spatial and spectral analyses of the data show that G29.7 -0.3 is composed of a hard X-ray, nonthermal central source and a soft X-ray, thermal shell. Combining the results of our analysis with radio determinations of the distance to G29.7 -0.3 and its shell diameter (Becker & Helfand), we estimate the luminosities of the- two components of the SNR as well as its total mass and age. The Crab-like core has an X-ray luminosity of LX ≍ 1 x 1036 ergs s-1, making it the second most luminous synchrotron nebula in the Galaxy. The thermal X-ray emission of the shell supports an age estimate comparable to that of the Crab, and the shell's inferred composition and mass are consistent with a massive progenitor. An estimate of the current energy loss rate of the unseen pulsar from the synchrotron nebula's X-ray luminosity, coupled with a calculation of the total energy in nebular particles and fields from the shape of the radio-to-X-ray spectrum, also gives an age estimate of ≍1O3 yr.

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