Department of Physics, Faculty of Science & Engineering, Chuo University
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)
Department of Physics, Faculty of Science & Engineering, Chuo University
CRESST and X-ray Astrophysics Laboratory NASA/GSFC
CRESST and X-ray Astrophysics Laboratory NASA/GSFC
European Space Agency, XMM-Newton Science Operations Centre, European Space Astronomy Centre
Departement de Physique, Universite de Montreal
Institute for Astronomy, Royal Observatory
National Research Council of Canada
School of Physics and Astronomy, The University of Leeds
出版者
宇宙航空研究開発機構
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料:
雑誌名(英)
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
巻
JAXA-SP-09-008E
ページ
198 - 199
発行年
2010-02-26
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
抄録（英）
We report on preliminary results of the Suzaku observations of the W-R binary WR 140 (WC7+O5I), with the aim of understanding the W-R stellar wind as well as the wind-wind collision shocks. Our observations with exposures of 210 ksec in total were made at four different epochs around periastron passage in Jan. 2009. We detected hard X-ray excess in the HXD band. This is the first time that the hard X-ray excess above 10 keV was detected from a W-R binary. Moreover, we found a part of the soft component is not absorbed even by the dense wind. The spectra can be fitted by three different components, with a stationary soft component at kT approximately 0.1 keV, a high temperature component at kT approximately 3 keV and a harder power-low component. The column density at periastron is a factor of 30 higher than that at pre-periastron, which can be explained as self-absorption of the W-R wind. It is found that the emission measure of high temperature component is not proportional to the inverse of the separation of the two stars.
内容記述（英）
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
X-ray monitoring of the Wolf-Rayet binary WR140 with Suzaku
64574071.pdf
(374.3KB)
