@inproceedings{oai:jaxa.repo.nii.ac.jp:00004998,
 author = {榎戸, 輝揚 and 中川, 友進 and 中澤, 知洋 and 牧島, 一夫 and Enoto, Teruaki and Rea, N. and Nakagawa, Yujin E. and Nakazawa, Kazuhiro and Sakamoto, T. and Makishima, Kazuo and Suzaku Magnetar team},
 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, Recently, extremely hard X-ray tails have been observed in several magnetars, with photon indexes above 10 keV of gamma approximately1. The emission mechanism of this new enigmatic component has not yet been conclusively unveiled. Last two years, Suzaku has performed two target-of-opportunity (ToO) observations: the first one pointing on the newly discovered magnetar SGR 0501+4516, and the second one on the radio transient magnetar 1E 1547.0-5408, both soon after a large X-ray outburst. Suzaku successfully detected extremely hard power-law components with gamma = 0.79 and 1.54 for SGR 0501+4516 and 1E 1547.0-5408, respectively, as well as their soft X-ray thermal and non-thermal emissions. We found that the hard X-ray fluxes are comparable to or larger than the soft X-rays, and the wide-band spectrum of SGR 0501+4516 looked more like AXPs, while 1E 1547.0-5408 has a spectrum more similar to SGRs. Furthermore, combining these results with published ones, we found that the ratio of hard over soft X-ray flux of magnetars, seems to negatively (or positively) correlate with their characteristic ages (or magnetic fields). This gives a further hint for unifying SGRs and AXPs into one scheme, directly connected to decay of the magnetic activity in the evolution of magnetars. Now a magnetar key project is in progress, where 10 magnetars have already been observed to emit hard X-rays., 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: AA0064574066, レポート番号: JAXA-SP-09-008E},
 pages = {186--189},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Suzaku Studies of the Extremely Hard Emission Components of Magnetars},
 volume = {JAXA-SP-09-008E},
 year = {2010}
}