TeV双星II：LS 5039的深钱德拉观测
Deep Chandra observations of TeV binaries II: LS 5039
摘要：
我们报告钱德拉观测的TeV发射高质量X射线双星LS 5039，总曝光量约为70千秒，使用ACIS-S相机在连续时钟模式，以寻找一个可能的X射线脉冲星在这个系统中。我们没有发现任何周期或准周期信号在0.3-0.4和0.75-0.9的轨道相位，在0.005-175赫兹的频率范围。我们推导出了平均脉冲分数3sigma上限的存在下的周期性信号的~15%（取决于频率和能带），最深的限制曾经达到这个对象。如果LS 5039的X射线发射是由于（至少部分）旋转动力脉冲星，后者要么旋转速度超过~5.6 ms，要么有一个光束指向远离我们的视线，或者在我们观察到的轨道相位中贡献了系统总X射线发射的~15%。
英文摘要：
We report on Chandra observations of the TeV emitting High Mass X-ray Binary LS 5039, for a total exposure of ~70ks, using the ACIS-S camera in Continuos Clocking mode to search for a possible X-ray pulsar in this system. We did not find any periodic or quasi-periodic signal in the 0.3-0.4 and 0.75-0.9 orbital phases, and in a frequency range of 0.005-175 Hz. We derived an average pulsed fraction 3sigma upper limit for the presence of a periodic signal of ~15% (depending on the frequency and the energy band), the deepest limit ever reached for this object. If the X-ray emission of LS 5039 is due (at least in part) to a rotational powered pulsar, the latter is either spinning faster than ~5.6 ms, or having a beam pointing away from our line of sight, or contributing to ~15% of the total X-ray emission of the system in the orbital phases we observed.
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