@inproceedings{oai:jaxa.repo.nii.ac.jp:00004946,
 author = {中村, 良子 and 馬場, 彩 and 石田, 学 and 山崎, 了 and 立松, 健一 and 郡, 和範 and Nakamura, Ryoko and Bamba, Aya and Ishida, Manabu and Yamazaki, Ryo and Tatematsu, Kenichi and Kohri, Kazunori and Puhlhofer, Gerd and Wagner, Stefan J.},
 book = {宇宙航空研究開発機構特別資料:, JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H},
 month = {Feb},
 note = {The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan, We report on the discovery of a non-thermal X-ray emission from the supernova remnant (SNR) W28. W28 is a cosmic ray accelerator from which GeV and TeV gamma-ray were detected. We analyzed the northeast part of W28, and found a power-law spectrum with a photon index of 2.4 (2.1-2.8) from an inner region which is probably non-thermal X-ray emission caused by particle acceleration. On the assumption that it is synchrotron X-ray, the cooling time of synchrotron photon is consistent with the age of W28 with a few micro-G magnetic field. On the other hand, we have no significant X-ray flux from one of the TeV gamma-ray emission region. Assuming a power-law spectrum with a photon index of 2.66, the same as in the TeV band, we obtained a 2-10 keV flux upper limit of 2.1 x 10(exp -14) ergs/s sq cm. Low brightness in X-ray and the coincidence of the molecular cloud and TeV gamma-ray emission site suggests that TeV gamma-ray is originated from accelerated protons., Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science, 資料番号: AA0064574014, レポート番号: JAXA-SP-09-008E},
 pages = {40--41},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Discovery of a Hard X-ray Spectrum from the Mixed Morphology SNR W28 with XMM-Newton},
 volume = {JAXA-SP-09-008E},
 year = {2010}
}