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arXiv 0903.1905astro-ph.GAastro-ph.SR
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在银河系里到处都是外星人-- II。银河系动力学

Populating the Galaxy with pulsars -- II. Galactic dynamics

Paul Kiel, Jarrod Hurley

摘要:

我们在我们的银河系内产生合成的星群,并计算由此产生的标度高度以及星群的径向和空间速度分布。给出了孤立双稳星、双稳星和毫秒双稳星的计算结果。我们还测试了结果的稳健性的变化,假设形式的银河系的潜力,出生分布的二进制的位置,和强度的速度踢给中子星在出生。我们发现,孤立的双星有一个更大的规模比二元双星的高度。这也适用于毫秒脉冲星,除非我们允许低质量恒星被脉冲星伴星的辐射烧蚀,在这种情况下,孤立和双星的尺度高度是可比的。双中子星被发现有各种各样的空间速度,特别是,一些系统的速度与太阳相似。我们详细地研究了预测的银河系中有黑洞伴星的毫秒双星的数量,包括它们的形成途径,并展示了短周期系统在银河系中的位置。我们的一些人口预测进行了比较,在一个有限的方式观察,但这方面的全部潜力将在不久的将来实现,当我们完成我们的人口合成代码与选择效应组件。

英文摘要:

We produce synthetic populations of pulsars within our Galaxy and calculate the resulting scale heights as well as the radial and space velocity distributions of the pulsars. Results are presented for isolated pulsars, binary pulsars and millisecond pulsars. We also test the robustness of the outcomes to variations in the assumed form of the Galactic potential, the birth distribution of binary positions, and the strength of the velocity kick given to neutron stars at birth. We find that isolated pulsars have a greater scale height than binary pulsars. This is also true when restricted to millisecond pulsars unless we allow for low-mass stars to be ablated by radiation from their pulsar companion in which case the isolated and binary scale heights are comparable. Double neutron stars are found to have a large variety of space velocities, in particular, some systems have speeds similar to the Sun. We look in detail at the predicted Galactic population of millisecond pulsars with black hole companions, including their formation pathways, and show where the short-period systems reside in the Galaxy. Some of our population predictions are compared in a limited way to observations but the full potential of this aspect will be realised in the near future when we complete our population synthesis code with the selection effects component.

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