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Published June 20, 1999 | Published
Journal Article Open

Discovery of Pulsed X-Ray Emission from the Small Magellanic Cloud Transient RX J0117.6–7330

Abstract

We report on the detection of pulsed, broadband, X-ray emission from the transient source RX J0117.6-7330. The pulse period of 22 s is detected by the ROSAT/PSPC instrument in a 1992 September 30-October 2 observation and by the Compton Gamma-Ray Observatory/BATSE instrument during the same epoch. Hard X-ray pulsations are detectable by BATSE for approximately 100 days surrounding the ROSAT observation (1992 August 28-December 8). The total directly measured X-ray luminosity during the ROSAT observation is 1.0 × 10^(38) (d/60 kpc)^2 ergs s^(-1). The pulse frequency increases rapidly during the outburst, with a peak spin-up rate of 1.2 × 10^(−10) Hz s^(-1) and a total frequency change of 1.8%. The pulsed percentage is 11.3% from 0.1-2.5 keV, increasing to at least 78% in the 20-70 keV band. These results establish RX J0117.6-7330 as a transient Be binary system.

Additional Information

© 1999. The American Astronomical Society. Received 1999 January 13; accepted 1999 April 14; published 1999 May 25. This project made use of software and data provided by the High-Energy Astrophysics Archival Research Center (HEASARC) located at Goddard Space Flight Center. This work was supported at Caltech in part by NASA NAG5-3239.

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August 19, 2023
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