Superorbital variation in LMC X-4: tracing the precessing disk

Details Superorbital variation in LMC X-4: tracing the precessing disk Superorbital variation in LMC X-4: tracing the precessing disk

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.119h&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Computer Science

Accretion And Outflows

Scientific paper

We present Suzaku and XMM observations of the high-mass X-ray pulsar LMC X-4 at different phases in its superorbital cycle, which is due to the precession of a warped accretion disk. The superorbital period and phase for each observation is determined accurately using RXTE ASM data. At all superorbital phases, the broadband X-ray spectra are described by a high-energy power-law continuum as well as a soft blackbody component, which most likely originates from reprocessing of the hard X-rays by the inner accretion disk. As with the similar systems SMC X-1 and Her X-1, LMC X-4 shows variations in the phases of the hard and soft pulse profiles, consistent with viewing the illuminated accretion disk at different orientations.

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