Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303

Details Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303 Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303

2010-07-14

arxiv.org/abs/1007.2272v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

The Astrophysical Journal Letters (2010), in press

Scientific paper

We report on the analysis of Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring observations of the $\gamma$-ray binary system LS I +61 303, covering 35 full cycles of its orbital motion. This constitutes the largest continuous X-ray monitoring dataset analyzed to date for this source. Such an extended analysis allows us to report: a) the discovery of variability in the orbital profiles of the X- ray emission, b) the existence of a few (recent) short flares on top of the overall behavior typical of the source, which, given the PCA field-of-view, may or may not be associated with LS I +61 303, and c) the determination of the orbital periodicity using soft X-ray data alone.

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