X-ray Observations Of Supergiant Fast X-ray Transients

Details X-ray Observations Of Supergiant Fast X-ray Transients X-ray Observations Of Supergiant Fast X-ray Transients

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0177s&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.77; Bulletin of the American Astronomical Society, Vol. 38, p.341

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Scientific paper

Over the last two years a new class of high-mass x-ray binary (HMXB) has come to be recognized. These systems show fast x-ray outbursts lasting on the order of hours, at unpredictable intervals, with faint but variable emission between outbursts. They have supergiant companions with a late O or early B spectral class, very similar to those of persistently bright wind-accretors like Vel X-1 and Cyg X-1. The prototypes of these "supergiant fast x-ray transients" (SFXTs) are XTE J1739-302 and IGR J17544-2619, but new candidates are now being identified at such a rate that they are almost certainly more numerous than persistent supergiant HMXBs, and possibly as numerous as Be/NS binaries, the other major class of HMXB. We will present results from RXTE, INTEGRAL, and Chandra on a number of these systems and candidates. We will present evidence that all wind-accreting supergiant systems are capable of these fast outbursts, and that there is a continuum of behavior between the SFXTs and the persistently bright sources. Finally, we will discuss the case of IGR J11215-5952, which seems to be an SFXT except that its outbursts have an apparent period of 329 days, while the pulsar period of 195 seconds places the source in the Be/NS part of the Corbet diagram.

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