Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-30
PoS Integral08:084,2008
Astronomy and Astrophysics
Astrophysics
Contributed talk to appear in the proceedings of the "7th INTEGRAL Workshop - An INTEGRAL View of Compact Objects", held in Co
Scientific paper
Supergiant Fast X-ray Transients (SFXTs) are a sub-class of High Mass X-ray Binaries (HMXBs) associated with OB supergiant companions and displaying transient X-ray activity. This behaviour is quite surprising since HMXBs hosting supergiants were known to be persistent sources, until the INTEGRAL discoveries obtained by means of the monitoring of the Galactic plane. We have been performing a monitoring campaign with Swift of four SFXTs with the main aim of characterizing both the long-term behaviour of these transients and the properties during bright outbursts. Here we discuss the properties of the X-ray emission observed outside the outbursts as well as the flares observed from two SFXTs: IGRJ17544-2916 and XTEJ1739-302. Contrarily to what previously thought, Swift allowed us to discover that SFXTs spend most of the time in accretion at a low level, even outside the bright outbursts, with an accretion luminosity of 1E33-1E34 erg/s, and that the quiescent level at ~1E32 erg/s is a much rarer state.
Burrows David N.
Cusumano Giancarlo
Evans Patricia A.
Gehrels Neil
Guidorzi Cristiano
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