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arXiv 1005.3479astro-ph.HE
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从吸积毫秒X射线脉冲星SWIFT J1749 4 -2807中发现的中微子

Discovery of Eclipses from the Accreting Millisecond X-ray Pulsar SWIFT J1749.4-2807

C. B. Markwardt, T. E. Strohmayer

摘要:

我们报道了在最近发现的吸积毫秒X射线脉冲星Swift J1749.4-2807中发现的X射线食。这是第一次在这种类型的系统中探测到X射线日食,一旦确定和研究伴星,就可以精确测量中子星的质量。我们提出了一个组合脉冲和日食定时的解决方案,使轨道参数和倾角的严格约束,并表明伴星质量的范围是在0.6-0.8 M太阳的可能范围内的中子星质量,它是大于主序星相同的质量。我们观察到两个单独的日食出口和一个单一的入口。我们的时间模型显示,日食的特征是对称的时间90度经度从升交点,正如预期的那样。我们的日食计时解决方案给出了日食持续时间(从入口到出口的中点)为2172 +/- 13秒。这相当于8.82小时轨道周期的6.85%。该系统还提出了一个潜在的测量“夏皮罗”延迟由于广义相对论,通过这种技术单独,我们设置了上限的伴星质量为2.2 M_太阳。

英文摘要:

We report the discovery of X-ray eclipses in the recently discovered accreting millisecond X-ray pulsar Swift J1749.4-2807. This is the first detection of X-ray eclipses in a system of this type and should enable a precise neutron star mass measurement once the companion star is identified and studied. We present a combined pulse and eclipse timing solution that enables tight constraints on the orbital parameters and inclination and shows that the companion mass is in the range 0.6-0.8 M_sun for a likely range of neutron star masses, and that it is larger than a main sequence star of the same mass. We observed two individual eclipse egresses and a single ingress. Our timing model shows that the eclipse features are symmetric about the time of 90 deg longitude from the ascending node, as expected. Our eclipse timing solution gives an eclipse duration (from the mid-points of ingress to egress) of 2172 +/- 13 s. This represents 6.85% of the 8.82 hr orbital period. This system also presents a potential measurement of "Shapiro" delay due to General Relativity; through this technique alone, we set an upper limit to the companion mass of 2.2 M_sun.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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