Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE

Details Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE

2008-09-24

arxiv.org/abs/0809.4254v2

Astrophys.J.693:1621-1627,2009

Astronomy and Astrophysics

Astrophysics

24 pages, 7 figures, 2 tables. Accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/693/2/1621

We report on the results of a long term X-ray monitoring campaign of the galactic binary LS I +61 303 performed by the Rossi X-ray Timing Explorer. This dataset consists of 1 ks pointings taken every other day between 2007 August 28 until 2008 February 2. The observations covered six full cycles of the 26.496 day binary period and constitute the largest continuous X-ray monitoring dataset on LS I +61 303 to date with this sensitivity. There is no statistically strong detection of modulation of flux or photon index with orbital phase; however, we do find a strong correlation between flux and photon index, with the spectrum becoming harder at higher fluxes. The dataset contains three large flaring episodes, the largest of these reaching a flux level of 7.2 (+0.1,-0.2)*10^-11 erg cm^-2 s^-1 in the 3-10 keV band, which is a factor of three times larger than flux levels typically seen in the system. Analysis of these flares shows the X-ray emission from LS I +61 303 changing by up to a factor of six over timescales of several hundred seconds as well as doubling times as fast as 2 seconds. This is the fastest variability ever observed from LS I +61 303 at this wavelength and places constraints on the size of the X-ray emitting region.

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