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titleX-ray Observation of the X-ray Burster 1A 1742-294 in the Galactic Center Region with Suzaku
Author(jpn)神頭, 知美; 寺田, 幸功; 海老沢, 研; 田代, 信; 齋藤, 彗
Author(eng)Kouzu, Tomomi; Terada, Yukikatsu; Ebisawa, Ken; Tashiro, Makoto S.; Saitou, Kei
Author Affiliation(jpn)埼玉大学大学院理工学研究科; 埼玉大学大学院理工学研究科; 宇宙航空研究開発機構宇宙科学研究本部X線天文グループ; 埼玉大学大学院理工学研究科; 宇宙航空研究開発機構宇宙科学研究本部X線天文グループ
Author Affiliation(eng)Department of Physics, Science, Saitama University; Department of Physics, Science, Saitama University; Department of High Energy Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA); Department of Physics, Science, Saitama University; Department of High Energy Astrophysics, 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 page222
End page223
Publication date2010-02-26
Languageeng
AbstractThe object 1A 1742-294 is a type I (thermonuclear) X-ray burster having the brightest persistent X-ray emission in the Galactic center region. After the first X-ray observation with SAS-3(MXB 1742-29), 1A 1742-294 has been observed with various X-ray satellites including Granat/ART-P (Lutovinov et al. 2001). On 12th March 2007, Suzaku observed 1A 1742-294 during the Galactic center survey with 27 ksec exposure. Both the XIS and HXD PIN detected five bursts. Thanks to high sensitivities of Suzaku instruments, Suzaku successfully detected 1/4th dimmer bursts than those by Granat at the flux of up to 10 mCrab level in the same bandpass. The persistent spectrum can be reproduced by a bremsstrahlung model with a temperature of > 27 keV, which is over 3 times larger than 7.8 keV reported by Lutovinov et al. (2001). The average color temperature of bursts lies in 2-3 keV, which are canonical values of type I X-ray bursts. The time profiles of the bursts are well characterized by a fast rise (7 sec) followed by a smooth exponential decay. The decay time depends on the X-ray energy; 29.7, 18.4 and 12.0 sec in the 0.2-4 keV, the 4-8 keV and the 8-12 keV band, respectively.
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 (1A 1742-294, 2E 1742.9-2929) - X-rays: bursts
Document TypeConference Paper
JAXA Category特別資料
ISSN1349-113X
NCIDAA11984031
SHI-NOAA0064574083
Report NoJAXA-SP-09-008E
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/20511


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