@inproceedings{oai:jaxa.repo.nii.ac.jp:00005027,
 author = {磯部, 直樹 and 大須賀, 健 and 牧島, 一夫 and 水野, 恒史 and 久保田, あや and Isobe, Naoki and Ohsuga, Ken and Makishima, Kazuo and Mizuno, Tsunefumi and Kubota, Aya and Gandhi, Poshak},
 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, A Suzaku follow-up observation of the nearby galaxy NGC 1313 was performed on 2008 December 5-8. The 0.5 - 10 keV luminosity of the two ultraluminous X-ray sources (ULXs), X1 and X2, in the galaxy was measured as 7.1 x 10(exp 39) ergs  s(exp -1) and 1.9 x 10(exp 39) ergs s(exp -1), respectively, both of which are by a factor of 4 lower than those of the scientific working group (SWG) observation in 2005. The X-ray spectrum of X1 is described with a composite model, consisting of a power-law (PL) component with a high energy cut off and a cool accretion disk emission. In comparison with the SWG observation, the innermost disk temperature stayed relatively unchanged (T(sub in) approximately 0.25 keV), while the cut off energy became slightly higher (E(sub cut) = 6.88(sup +4.9)(sub -2.2) keV). On the other hand, X2 exhibited a transition from the disk-like spectrum to the PL-dominated one with a photon index of gamma = 1.84(sup +0.15)(sub -0.19), between the SWG and this follow-up observations. These results re-confirmed that the spectral properties of these two ULXs are successfully interpreted, on the basis of the very high and slim disk states of Galactic black holes at the sub- or trans-Eddington luminosities. As a result, the intermediate-mass-black-hole interpretation for ULXs are supported., 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: AA0064574095, レポート番号: JAXA-SP-09-008E},
 pages = {260--263},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Suzaku detections of luminosity-dependent spectral changes from the two ultraluminous X-ray sources, X1 and X2, in NGC 1313},
 volume = {JAXA-SP-09-008E},
 year = {2010}
}