Multiwavelength Rapid Variability in XTE J1118+480

Details Multiwavelength Rapid Variability in XTE J1118+480 Multiwavelength Rapid Variability in XTE J1118+480

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.3107h&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #31.07; Bulletin of the American Astronomical Society, Vol. 32, p.1233

Astronomy and Astrophysics

Astronomy

Scientific paper

The black hole candidate XTE J1118+480 has been in an unusual low-state outburst since January 2000. It has exhibited large amplitude rapid variability on timescales of tens of seconds and less at all wavelengths with a sufficient count rate to detect such variability. We will compare X-ray data with simultaneous (UV) and contemporaneous (UV--IR) data. Very similar power density spectra are seen at X-ray and UV wavelengths, with a prominent low-frequency QPO at ~0.1 Hz, evolving with time. Simultaneous X-ray and UV lightcurves are well correlated down to timescales of seconds. The correlated variability could arise either from reprocessing of X-ray variations by the disc or companion star, or from a component of emission originating in the X-ray production region, likely close to the compact object. Possible lags between the wavebands will constrain explanations. This presentation is funded by the Leverhulme Trust.

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