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Discovery of Pulsed X-ray Emission from RX J0117. 6-7330

Abstract:

We report on the detection of pulsed, broad-band, X-ray emission from the bright transient source RX J0117. 6-7330. The pulse period of 22 seconds is detected by the ROSAT/PSPC instrument in a 1992 Sep 30-Oct 2 observation and by the CGRO/BATSE instrument during the same epoch. Hard X-ray pulsations are detectable by BATSE for approximately 100 days surrounding the ROSAT observation (1992 Aug 28-Dec 8). The total X-ray luminosity during the ROSAT observation is estimated to be 2.11 x 10 37 ergs/s (d/60 kpc) 2. The pulsed fraction in the ROSAT band is 11.3%. A total 20-70 keV luminosity of 7.8 x 10 37 erg s-1 (d/60 kpc) 2 f-1 pulse where f pulse is the peak to peak ((mean-minimum)/mean) pulse fraction. Thus the total luminosity is greater than 10 38 ergs/s. Frequency history determinations give a large average frequency derivative of 8.9 x 10-11 Hz/s. These results establish RX J0117. 6-7330 …