Monitoring Fast Transient X-ray Binaries with the RXTE PCA Galactic Bulge Scans

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Scientific paper

Supergiant Fast X-ray Transients (SFXTs) are a recently-discovered, poorly-understood type of binary system in which a neutron star orbits a blue supergiant. Systems of this type have been known for decades as bright, persistent, variable emitters of x-rays (e.g. Vela X-1), but the new class of SFXTs show only occasional bright outbursts, remaining normally quiet at a factor of 10,000 below their peak luminosity. The major challenge in understanding these systems is why they do not continuously glow in x-rays due to accretion of the companion's wind. Highly eccentric orbits may explain some of the SFXTs, but cannot explain others with short orbital periods. Since the Rossi X-ray Timing Explorer (RXTE) discovered the first known SFXT, XTE J1739-302, most results on these systems, and most newly discovered members of the class, have come from the INTEGRAL satellite. We will present results from a long-term program of twice-weekly scans of the inner galaxy by the Proportional Counter Array (PCA) of RXTE. We confirm the recently-discovered orbital periods of SAX J1818.6-1703 and IGR J17544-2619 and study the variability characteristics of these and other fast-transient binaries in this long, uniform, and sensitive data set.

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