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arXiv 1402.6159astro-ph.HE
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轨道/超轨道相空间中的谱分析和LS I +61 303硬X射线中超轨道变化的暗示

Spectral analysis in orbital/superorbital phase space and hints of superorbital variability in the hard X-rays of LS I +61 303

Jian Li, Diego F. Torres, Shu Zhang

摘要:

我们在LSI +61 303的轨道/超轨道相空间中进行了积分谱分析。在所有轨道/超轨道阶段都观察到没有截止的硬X射线光谱。硬X射线指数被发现是不相关的无线电指数(非同时)测量在相同的轨道和超轨道阶段。特别是,在负射电指数期间没有X射线光谱软化,这不利于简单地解释微类星体状态变化的射电指数变化。我们揭示了硬X射线通量的超轨道变化的暗示,与软X射线的超轨道调制相一致。观测到射电峰值通量和指数沿超轨道周期的轨道相位漂移。我们探讨它的影响,以前报道的双峰结构的射电轨道光变曲线,把它作为一个合理的解释。

英文摘要:

We present INTEGRAL spectral analysis in the orbital/superorbital phase space of LS I +61 303. A hard X-ray spectrum with no cutoff is observed at all orbital/superorbital phases. The hard X-ray index is found to be uncorrelated with the radio index (non-simultaneously) measured at the same orbital and superorbital phases. In particular, the absence of an X-ray spectrum softening during the periods of negative radio index does not favor a simple interpretation of the radio index variations in terms of changes of state in a microquasar. We uncover hints for the superorbital variability in the hard X-ray flux, in phase with the superorbital modulation in soft X-rays. An orbital phase drift of radio peak flux and index along the superorbital period is observed in the radio data. We explore its influence on a previously reported double peak structure of radio orbital lightcurve, posing it as a plausible explanation.

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