G65.2+5.7: A Thermal Composite Supernova Remnant with a Cool Shell
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2004
- DOI:
- 10.1086/424029
- arXiv:
- arXiv:astro-ph/0409692
- Bibcode:
- 2004ApJ...615..275S
- Keywords:
-
- ISM: Individual: Alphanumeric: G65.2+5.7;
- ISM: Supernova Remnants;
- X-Rays: ISM;
- Astrophysics
- E-Print:
- In AASTEX preprint form, document is 12 pages long and includes 3 figure files