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First Results from the All-Sky Monitor on the [ITAL]Rossi X-Ray Timing Explorer[/ITAL]

1996; IOP Publishing; Volume: 469; Issue: 1 Linguagem: Inglês

10.1086/310260

1538-4357

Alan M. Levine, H. Bradt, Wei Cui, J. G. Jernigan, E. Morgan, Ronald A. Remillard, R. Shirey, D. A. Smith,

Astronomical Observations and Instrumentation

The all-sky monitor on the Rossi X-Ray Timing Explorer has been monitoring the sky in the 1.5-12 keV band since late February. The instrument consists of three coded-aperture cameras that can be rotated to view different regions by a motorized drive assembly. Intensities of ~100 known sources are obtained via least-squares fits of shadow patterns to the data and compiled to form X-ray light curves. Six orbital periodicities and four long-term periodicities, all previously known, have been detected in these light curves. Searches for additional sources have also been conducted. X-ray light curves for the Crab Nebula, Cyg X-1, 4U 1705-44, GRO J1655-40, and SMC X-1 are reported. They illustrate the quality of the results and the range of observed phenomena.