HAL : in2p3-00126099, version 1

arXiv : astro-ph/0612437

DOI : 10.1086/511818

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Astrophysical Journal 655 (2007) L101-L104

IGR J08408--4503: a new recurrent Supergiant Fast X-ray Transient

D. Gotz1, M. Falanga1, 2, F. Senziani, A. De Luca, S. Schanne1, A. von Kienlin

INTEGRAL Collaboration(s)

(2007)

The supergiant fast X-ray transient IGR J08408-4503 was discovered by INTEGRAL on May 15, 2006, during a bright flare. The source shows sporadic recurrent short bright flares, reaching a peak luminosity of 10^36 erg s^-1 within less than one hour. 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 broad-band 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 cut-off at ~15 keV. The absorption column density during the flares was found to be ~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 one year, a spin period of the order of hours and a magnetic field of the order of 10^13 G.

1 :	DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :	APC - AstroParticule et Cosmologie

équipe(s) de recherche : APC - AHE

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique

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Soumis le : Mardi 23 Janvier 2007, 15:55:08

Dernière modification le : Lundi 18 Juin 2012, 16:08:47