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Title:
G65.2+5.7: A Thermal Composite Supernova Remnant with a Cool Shell
Authors:
Shelton, R. L.; Kuntz, K. D.; Petre, R.
Affiliation:
AA(Department of Physics and Astronomy and the Center for Simulational Physics, University of Georgia, Athens, GA 30602; . ), AB(Department of Physics, University of Maryland in Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250; .), AC(NASA Goddard Space Flight Center, Code 666, Greenbelt, MD 20771; .)
Publication:
The Astrophysical Journal, Volume 615, Issue 1, pp. 275-279. (ApJ Homepage)
Publication Date:
11/2004
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: G65.2+5.7, ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/424029
Bibliographic Code:
2004ApJ...615..275S

Abstract

This paper presents archival ROSAT PSPC observations of the G65.2+5.7 supernova remnant (also known as G65.3+5.7). Little material obscures this remnant, and so it was well observed, even at the softest end of ROSAT's bandpass (~0.11-0.28 keV). These soft X-ray images reveal the remnant's centrally filled morphology, which, in combination with existing radio frequency observations, places G65.2+5.7 in the thermal composite (mixed-morphology) class of supernova remnants. Not only might G65.2+5.7 be the oldest known thermal composite supernova remnant, but owing to its optically revealed cool, dense shell, this remnant supports the proposal that thermal composite supernova remnants lack X-ray-bright shells because they have evolved beyond the adiabatic phase. These observations also reveal a slightly extended point source centered on R.A. 19h36m46s, decl. 30°40'07" and extending 6.5m in radius in the band 67 map. The source of this emission has yet to be discovered, as there is no known pulsar at this location.
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