Unveiling the super-orbital modulation of LS I +61 303 in X-rays

Details Unveiling the super-orbital modulation of LS I +61 303 in X-rays Unveiling the super-orbital modulation of LS I +61 303 in X-rays

2011-11-30

arxiv.org/abs/1111.7068v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 3 figures, 1 table, Accepted to ApJ Letters

Scientific paper

From the longest monitoring of LS I +61 303 done to date by the Rossi X-ray Timing Explorer (RXTE) we found evidence for the long-sought, years- long modulation in the X-ray emission of the source. The time evolution of the modulated fraction in the orbital lightcurves can be well fitted with a sinusoidal function having a super-orbital period of 1667 days, the same as the one reported in non-contemporaneous radio measurements. However, we have found a 281.8 \pm 44.6 days shift between the super-orbital variability found at radio frequencies extrapolated to the observation time of our campaign and what we found in the super-orbital modulation of the modulated fraction of our X-ray data. We also find a super-orbital modulation in the maximum count rate of the orbital lightcurves, compatible with the former results, including the shift.

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