IGR J08408-4503:: A new recurrent supergiant fast X-ray transient

被引：18
作者：
Gotz, D. [1 ]
Falanga, M.
Senziani, F.
De Luca, A.
Schanne, S.
von Kienlin, A.
机构：
[1] CEA Saclay, DSM DAPNIA, Serv Astrophys, Gif Sur Yvette, France
[2] Unite Mixte Rech Astroparticule & Cosmol, Paris, France
[3] INAF IASF, Milan, Italy
[4] Univ Toulouse 3, F-31062 Toulouse, France
[5] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy
[6] INFN, I-27100 Pavia, Italy
[7] Max Planck Inst Extraterr Phys, Garching, Germany
来源：
ASTROPHYSICAL JOURNAL | 2007年 / 655卷 / 02期
关键词：
X-rays : binaries; X-rays : bursts; X-rays : individual (IGR J08408-4503);
D O I：
10.1086/511818
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The supergiant fast X-ray transient IGR J08408-4503 was discovered by INTEGRAL on 2006 May 15 during a bright flare. The source shows sporadic recurrent short bright flares, reaching a peak luminosity of 10(36) ergs s(-1) within less than 1 hr. The companion star is HD 74194, an Ob5Ib(f) supergiant star located at 3 kpc in the Vela region. We report the light curves and broadband spectra (0.1-200 keV) of all the three flares of IGR J08408-4503 detected up to now, based on INTEGRAL and Swift data. The flare spectra are well described by a power-law model with a high-energy cutoff at similar to 15 keV. The absorption column density during the flares was found to be similar to 10(21) cm(-2), indicating a very low matter density around the compact object. Using the supergiant donor star parameters, the wind accretion conditions imply an orbital period of the order of 1 yr, a spin period of the order of hours, and a magnetic field of the order of 10(13) G.
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页码：L101 / L104
页数：4
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