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arXiv 0705.3451astro-ph
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关于观测球状星团中脉冲星Shapiro效应的可能性

On the Possibility of Observing the Shapiro Effect for Pulsars in Globular Clusters

T. I. Larchenkova, A. A. Lutovinov

备注：
26 pages, 9 figures
发表信息：
Astron.Lett.33:455-467,2007
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摘要：

对于球状星团中的类星体，我们建议利用观测它们在靠近视线的大质量天体引力场中辐射的相对论时间延迟（夏皮罗效应）来探测和识别不可见的致密天体，并研究球状星团和银河系各组成部分中可见物质和暗物质的分布。我们推导了两种模型的质量分布在银河系中的事件概率的依赖性的纬度和经度的来源：经典的Bahcall-Soneira模型和最近的Dehnen-Binney模型。利用三个球状星团（M15，47 Tuc，Terzan 5）作为一个例子，我们表明，球状星团47 Tuc和M15中的恒星，由于大质量银河系天体靠近视线通过而引起的事件的概率与参数f2的比值，与星团中大质量天体靠近视线通过的概率的比值相当，并且比大质量天体靠近视线通过的概率的比值高得多。泰山5号星系团我们估计了这类事件的发生率。我们已经确定了在脉冲星视线附近的物体的数量，这些物体可以产生脉冲到达时间的调制，这是我们所考虑的效应的特征;银河系盘中的褐矮星的数量，其密度与盘星的密度相当，这是第一次考虑到。

英文摘要：

For pulsars in globular clusters, we suggest using observations of the relativistic time delay of their radiation in the gravitational eld of a massive body (the Shapiro effect) located close to the line of sight to detect and identify invisible compact objects and to study the distribution of both visible and dark matter in globular clusters and various components of the Galaxy. We have derived the dependences of the event probability on the Galactic latitude and longitude of sources for two models of the mass distribution in the Galaxy: the classical Bahcall-Soneira model and the more recent Dehnen-Binney model. Using three globular clusters (M15, 47 Tuc, Terzan 5) as an example, we show that the ratios of the probability of the events due to the passages of massive Galactic objects close to the line of sight to the parameter f2 for pulsars in the globular clusters 47 Tuc and M15 are comparable to those for close passages of massive objects in the clusters themselves and are considerably higher than those for the cluster Terzan 5. We have estimated the rates of such events. We have determined the number of objects near the line of sight toward the pulsar that can produce a modulation of its pulse arrival times characteristic of the effect under consideration; the population of brown dwarfs in the Galactic disk, whose concentration is comparable to that of the disk stars, has been taken into account for the first time.

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