Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA)
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
224 - 225
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 the results of Suzaku and RXTE X-ray observations of XSS J12270-4859, one of the hard X-ray sources in the INTEGRAL catalogue. From optical spectroscopic characteristics and a report of putative X-ray periodicity of approximately 860 s, the object was once classified as an intermediate polar (IP). Our Suzaku observation revealed a lack of the Fe Kalpha emission in a power-law spectrum and exotic phenomena in the light curve such as (1) repetitive rapid flux amplification, (2) sudden flux declines with no periodicity, and (3) spectral hardening. We also analyzed archival RXTE data, confirming flux variations similar to those found in Suzaku, and found that the previously reported 860 s period is interpreted by semi-regularly repeated flares. These timing behaviors and the power-law spectrum suggest that XSS J12270-4859 is a low-mass X-ray binary rather than an IP. Some of the temporal characteristics are also similar to those of the type II bursters, making XSS J12270-4859 a very rare type II burster candidate.
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
Suzaku observation of the enigmatic hard X-ray source XSS J12270-4859
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