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arXiv 0809.4254astro-ph
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TeV二元LS I +61 303与RXTE的长期X射线监测

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

A. Smith, P. Kaaret, J. Holder, A. Falcone, G. Maier, D. Pandel, M. Stroh

摘要:

本文报道了Rossi X射线定时探测器对银河双星LS I +61 303进行长期X射线观测的结果。该数据集由2007年8月28日至2008年2月2日期间每隔一天采集的1 ks点组成。观察结果涵盖了26.496天二元周期的6个完整周期,构成了迄今为止LS I +61 303上具有该灵敏度的最大连续X射线监测数据集。有没有统计上强有力的检测调制的通量或光子指数与轨道相位,但是,我们发现通量和光子指数之间的强相关性,与光谱变得更难在较高的通量。该数据集包含三个大的耀斑事件,其中最大的一次在3-10 keV波段达到了7.2(+0.1,-0.2)*10^-11 erg cm^-2 s^-1的通量水平,这是该系统中通常看到的通量水平的三倍。对这些耀斑的分析表明,LS I +61 303发射的X射线在数百秒的时间尺度上变化高达6倍,并且快至2秒的两倍。这是在该波长下从LS I +61 303观测到的最快的变化,并且对X射线发射区域的大小施加了限制。

英文摘要:

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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