Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4

Details Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4 Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4

2005-04-27

arxiv.org/abs/astro-ph/0504601v1

Astron.Lett. 31 (2005) 380-387; Pisma Astron.Zh. 31 (2005) 427-436

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures, Astronomy Letters, 31, 380-387 (2005)

Scientific paper

10.1134/1.1940110

We analyze the observations of the X-ray pulsar LMC X-4 performed by the INTEGRAL observatory and the All-Sky Monitor (ASM) of the RXTE observatory over a wide energy range. The observed hard X-ray flux from the source is shown to change by more than a factor of 50 (from ~70 mCrab in the high state to ~1.3 mCrab in the low state) on the time scale of the accretion-disk precession period, whose mean value for 1996-2004 was determined with a high accuracy, Pprec=30.275+/-0.004 days. In the low state, a flare about 10 h in duration was detected from the source; the flux from the source increased by more than a factor of 4 during this flare. The shape of the pulsar's broadband spectrum is essentially invariable with its intensity; no statistically significant features associated with the possible resonance cyclotron absorption line were found in the spectrum of the source.

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