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Astron. Astrophys. 354, 938-942 (2000)


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Observation of X-ray transient XTE J1748-288 by the Indian X-ray astronomy experiment

S. Naik 1, P.C. Agrawal 1, B. Paul 1,2, A.R. Rao 1, S. Seetha 3 and K. Kasturirangan 3

1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai - 400 005, India
2 Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
3 ISRO Satellite Center, Airport Road, Vimanapura P.O., Bangalore - 560017, India

Received 15 March 1999 / Accepted 7 January 2000

Abstract

The observations of a newly discovered X-ray transient source XTE J1748-288 were made in the energy band 2 - 18 keV with the Indian X-ray Astronomy Experiment(IXAE) on the IRS-P3 satellite during 1998, June 14-25. The source count rate declined gradually with an exponential decay time of 19 [FORMULA] 1.6 days. The X-ray light curves showed no significant intensity variations on short time scales ([FORMULA] 10s). The power density spectrum obtained from timing analysis of the data shows no quasi-periodic oscillations in the frequency range of 0.002 Hz to 5 Hz. From the observed X-ray and radio characteristics, it is suggested that the X-ray source in XTE J1748-288 is more likely to be a black hole rather than a neutron star.

Key words: accretion, accretion disks – black hole physics – stars: individual: XTE J1748-288 – X-rays: stars

Send offprint requests to: S. Naik (sachi@tifr.res.in)

© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000

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