2009年9月
Search for VHE gamma rays from SS433/W50 with the CANGAROO-II telescope
ASTROPARTICLE PHYSICS
- 巻
- 32
- 号
- 2
- 開始ページ
- 112
- 終了ページ
- 119
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.astropartphys.2009.06.006
- 出版者・発行元
- ELSEVIER SCIENCE BV
SS433, located at the center of the supernova remnant W50, is a close proximity binary system consisting of a compact star and a normal star. jets of material are directed outwards from the vicinity of the compact star symmetrically to the east and west. Non-thermal hard X-ray emission is detected from lobes lying on both sides. Shock accelerated electrons are expected to generate VHE gamma rays through the inverse-Compton process in the lobes. Observations of the western X-ray lobe region of SS433/W50 system have been performed to detect VHE gamma rays using the 10 m CANGAROO-II telescope in August and September, 2001, and July and September, 2002. The total observation times are 85.2 h for ON Source, and 80.8 h for OFF source data. No significant excess of VHE gamma rays has been found at three regions of the western X-ray lobe of SS433/W50 system. We have derived 99% confidence level upper limits to the fluxes of gamma rays and have set constraints on the strengths of the magnetic fields assuming the synchrotron/inverse-Compton model for the wide energy range of photon spectrum from radio to TeV. The derived lower limits are 4.3 mu G for the center of the brightest X-ray emission region and 6.3 mu G for the far end from SS433 in the western X-ray lobe. In addition, we suggest that the spot-like X-ray emission may provide a major contribution to the hardest X-ray spectrum in the lobe. (C) 2009 Elsevier B.V. All rights reserved.
- リンク情報
-
- DOI
- https://doi.org/10.1016/j.astropartphys.2009.06.006
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902224967409062
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000271340800004&DestApp=WOS_CPL
- ID情報
-
- DOI : 10.1016/j.astropartphys.2009.06.006
- ISSN : 0927-6505
- J-Global ID : 200902224967409062
- Web of Science ID : WOS:000271340800004