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titleSuzaku observation of the enigmatic hard X-ray source XSS J12270-4859
Author(jpn)齋藤, 彗; 辻本, 匡弘; 海老沢, 研; 石田, 学
Author(eng)Saitou, Kei; Tsujimoto, Masahiro; Ebisawa, Ken; Ishida, Manabu
Author Affiliation(jpn)宇宙航空研究開発機構宇宙科学研究本部; 宇宙航空研究開発機構宇宙科学研究本部; 宇宙航空研究開発機構宇宙科学研究本部; 宇宙航空研究開発機構宇宙科学研究本部
Author Affiliation(eng)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)
Issue Date2010-02-26
Publisher宇宙航空研究開発機構
Japan Aerospace Exploration Agency (JAXA)
Publication title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
VolumeJAXA-SP-09-008E
Start page224
End page225
Publication date2010-02-26
Languageeng
AbstractWe 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.
DescriptionMeeting Information: The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
Keywordsstars: individual (XSS J12270-4859) - stars: variables: other - X-rays: stars
Document TypeConference Paper
JAXA Category特別資料
ISSN1349-113X
NCIDAA11984031
SHI-NOAA0064574084
Report NoJAXA-SP-09-008E
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/13850


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