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Synchrotron X-Ray SNR Candidates Discovered in the ASCA Galactic Plane Survey

Published online by Cambridge University Press:  12 May 2006

M. Ueno ,
S. Yamauchi ,
A. Bamba ,
H. Yamaguchi ,
K. Koyama  and
K. Ebisawa
M. Ueno
Affiliation:
Department of Physics, Faculty of Science, Tokyo Institute of Technology 2-12-1, Oo-okayama, Meguro-ku, Tokyo 152-8551, Japan email: masaru@hp.phys.titech.ac.jp
S. Yamauchi
Affiliation:
Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020-8550, Japan
A. Bamba
Affiliation:
RIKEN (The Institute of Physical and Chemical Research) 2-1, Hirosawa, Wako, Saitama 351-0198, Japan
H. Yamaguchi
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
K. Koyama
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
K. Ebisawa
Affiliation:
The Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency(JAXA) 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
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Abstract

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Shell-like supernova remnants (SNRs) are primary candidates for the origin of Galactic cosmic rays. However, among the known SNRs (about 220), only a small fraction has been known to exhibit the synchrotron X-ray spectrum, that is considered to be a piece of evidence for high energy particle acceleration. Synchrotron X-ray emitting SNRs are known to be systematically radio-quiet compared to the SNRs that do not emit synchrotron X-rays. Therefore, most synchrotron X-ray emitting SNR candidates may have escaped detection in the previous systematic radio surveys. On the other hand, hard X-ray surveys are effective to search for synchrotron X-ray emitting SNRs, because of its penetration power. Thus we have searched for SNRs in the ASCA Galactic Plane Survey data, the first Galactic imaging survey in $>$2 keV, and discovered 14 candidates. Deep follow-up observations with ASCA, XMM, or Chandra on 5 of them revealed 2 sources to be synchrotron X-ray emitting SNRs. Furthermore we confirmed non-thermal X-ray spectra from the other 3 sources, though the origin is yet unknown. We report the observational results and discuss the X-ray origin.

Keywords

supernova remnantscosmic raysGalaxy: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 333 - 337
Copyright
2006 International Astronomical Union