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

D. J. Macomb | Zendy; Mark H. Finger | Zendy; B. A. Harmon | Zendy; R. C. Lamb | Zendy; T. Prince | Zendy

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

Author(s) -

D. J. Macomb,

Mark H. Finger,

B. A. Harmon,

R. C. Lamb,

T. Prince

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/312074

Subject(s) - rosat , astrophysics , luminosity , physics , observatory , transient (computer programming) , x ray transient , x ray , astronomy , optics , neutron star , galaxy , computer science , operating system

We report on the detection of pulsed, broad-band, X-ray emission from thetransient source RX J0117.6-7330. The pulse period of 22 seconds is detected bythe ROSAT/PSPC instrument in a 1992 Sep 30 - Oct 2 observation and by theCGRO/BATSE instrument during the same epoch. Hard X-ray pulsations aredetectable by BATSE for approximately 100 days surrounding the ROSATobservation (1992 Aug 28 - Dec 8). The total directly measured X-ray luminosityduring the ROSAT observation is 1.0E38 (d/60 kpc)^2 ergs s-1. The pulsefrequency increases rapidly during the outburst, with a peak spin-up rate of1.2E-10 Hz s-1 and a total frequency change 1.8%. The pulsed percentage is11.3% from 0.1-2.5 keV, increasing to at least 78% in the 20-70 keV band. Theseresults establish RX J0117.6-7330 as a transient Be binary system.Comment: 17 pages, Latex, aasms, accepted for publication in ApJ Letter

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