A central X-ray source in the nonthermal radio nebula DA 495

  1. Get@NRC: A central X-ray source in the nonthermal radio nebula DA 495 (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1086/423338
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Journal titleThe Astrophysical Journal Letters
AbstractWe report the detection, in archival ROSAT and ASCA observations, of X-ray emission from the direction of DA 495 (G65.7+1.2), a likely supernova remnant of uncertain classification but with similarities to the Crab Nebula. An unusual feature of the radio nebula is its annular morphology, with a flux minimum at the geometrical center. In the soft X-ray band, the ROSAT data reveal a compact source near the edge of the central radio "hole"; the hard X-ray morphology, at the limit of ASCA's angular resolution, is suggestive of extended emission coincident with the ROSAT source. The X-ray flux is roughly constant with time, and its spectrum is well described by a power law with photon index ~1.7. Taken together, this evidence suggests identification of the X-ray source with a magnetospherically active neutron star and its associated wind nebula. Timing analysis of the ASCA data yields only a weak upper bound on pulsations with periods >~30 ms. These results reveal for the first time the high-energy engine that powers the DA 495 radio nebula and strengthen its classification as a plerionic supernova remnant, one that may represent the poorly explored late evolutionary stages of Crab-like nebulae.
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AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedNo
NPARC number9722532
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Record identifier1abf8dd2-fb88-452e-9f52-bdae1dea5395
Record created2009-07-17
Record modified2016-05-09
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