XTE J1118+480: Clues on the Nature of the Accretion Flow from the Optical Variability

Details XTE J1118+480: Clues on the Nature of the Accretion Flow from the Optical Variability XTE J1118+480: Clues on the Nature of the Accretion Flow from the Optical Variability

2000-11-06

arxiv.org/abs/astro-ph/0011121v1

Astrophys.Space Sci.276:213-216,2001

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. To be published in `Proceedings of the Third Microquasar Workshop: Granada Workshop on galactic relativisti

Scientific paper

10.1023/A:1011668001597

We show how the simultaneous presence of a strong quasi periodic oscillation (QPO) of period of about 10 seconds in the optical and X-ray lightcurves of the X-ray transient XTE J1118+480 can be used to obtain information about the nature of the accretion flow around the source. The unusually high optical-to-X-ray flux ratio and the QPO observed simultaneously in both energy bands suggest that a significant fraction of the optical flux might originate close to the central source, where most of the X-rays are produced and be indicative of a magnetically dominated corona. We also show how the temporal evolution of the QPO can provide us with information on both the inner radius and the viscous properties of the optically thick accretion disc.

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