RXTE PCA Contributions to Monitoring Faint Transients

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Past And Current X-Ray Monitoring

Scientific paper

The RXTE PCA has monitored the galactic bulge for 4.6 years. MXB 1730-33 and the 12 hr eclipsing binary Terzan 6 have the shortest recurrence periods, 150-200 days, and outburst durations of a few weeks. The variations of their outbursts are well sampled. The 2-20 year recurrent transients like EXO 1745-248, SAX J1750.8-2900, and SAXJ1747.0-2853 have generally fast rises and slow decays. Oscillations in the decays and large differences in peak fluxes prevent specific prediction of the course of a given outburst, but there are predictive correlations, and subsidence below a flux of 1/2 mCrab can be certified fairly reliably. KS 1731-26 turned off after being on at least 4.5 yr. 4U 1711-34 and XTE J1723-376 may have done the same. On the other hand, XTE J1759-220 came on 1.6 yr ago, after being off at least 2 years. These sources represent a range of source types in which certain levels of mass exchange are currently being driven. Of particular interest have been the millisecond pulsars SAX J1808.4-3658 and XTE J1751-305 and the black hole candidate V4641 Sgr, but better positions, spectroscopy, and timing begin to provide more in depth information about some of the others.

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