Seven Candidates for Supernova Remnants Emitting Synchrotron X-rays and Their Radio Properties

Details Seven Candidates for Supernova Remnants Emitting Synchrotron X-rays and Their Radio Properties Seven Candidates for Supernova Remnants Emitting Synchrotron X-rays and Their Radio Properties

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xrrc.proce4.18u&link_type=abstract

"X-Ray and Radio Connections (eds. L.O. Sjouwerman and K.K Dyer) Published electronically by NRAO, http://www.aoc.nrao.edu/event

Physics

X-Ray, Radio, Supernova Remnants

Scientific paper

Using the ASCA Galactic Plane Survey, we found seven candidates for shell-type supernova remnants (SNRs) emitting synchrotron X-rays. We have been making follow-up observations with ASCA, Chandra and/or XMM-Newton. As a result, for two candidates (G28.6-0.1 and G32.45+1.0), truly diffuse and shell-like structures were confirmed using high spatial resolution of Chandra or XMM-Newton. Three sources (G11.0+0.0, G25.5+0.0, and G26.6-0.1) were found to be extended larger than a point-source with ASCA, but observations with higher spatial resolution are required to determine whether they are shell SNRs or not. One source (G38.55+0.0) was observed with XMM-Newton, but no diffuse structure was detected, and no follow-up observation has been done for the last one (G23.5+0.1). We found that the parameters of three of those candidates (G25.5+0.0, G28.6-0.1, and G32.45+1.0) are similar to SN1006 and therefore we regard them as SNRs emitting synchrotron X-rays. Adding these sources to the radio Σ-D relation by Case & Bhattacharya (1998), we found that they are located in a radio faint region. One possible explanation is that SNRs efficiently accelerating high energy electrons are located in low density regions.

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