The Central Engine of the Unusual Supernova Remnant DA 495

Details The Central Engine of the Unusual Supernova Remnant DA 495 The Central Engine of the Unusual Supernova Remnant DA 495

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1018a&link_type=abstract

American Astronomical Society, HEAD meeting #7, #10.18; Bulletin of the American Astronomical Society, Vol. 35, p.614

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe new and archival X-ray observations of the synchrotron nebula DA 495 (G65.7+1.2), a likely supernova remnant with properties similar to those of the Crab Nebula. Two unusual features of the radio nebula are its uncharacteristically steep radio spectrum and its annular morphology, with a flux minimum at the geometrical center. A recently acquired Chandra image confirms results derived from earlier ROSAT and ASCA observations: the X-ray morphology strongly suggests extended ``plerionic'' emission roughly centered on a hard, unresolved source lying near the edge of the central radio ``hole.'' The power-law spectrum of the source is consistent with that of a magnetospherically active neutron star. Our results reveal for the first time the high-energy engine powering the synchrotron nebula, and strengthen the classification of DA 495 as a plerionic supernova remnant, one that may represent a late evolutionary stage of Crab-like plerions.

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