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arXiv 0710.4518astro-ph
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脉冲星40年:孤立射电脉冲星的诞生和演化

40 Years of Pulsars: The Birth and Evolution of Isolated Radio Pulsars

C. -A. Faucher-Giguere, V. M. Kaspi

摘要:

我们调查的诞生和演化的孤立的无线电卫星使用人口合成方法,建模的出生属性的卫星,它们的时间演化,以及它们的检测在帕克斯和斯温伯恩多波束(MB)调查。Parkes和Swinburne MB调查一起检测了近2/3的已知恒星,并提供了一个非常均匀的样本与模拟进行比较。新的自行测量和一个改进的模型的自由电子在星际介质,NE 2001的分布,也使重新审视这些问题特别值得。我们提出了一个简单的人口模型,再现实际的观察,并考虑其他失败。我们的结论是:恒星诞生于旋臂中,其诞生率为2.8 ± 0.5个恒星/世纪,在距银心约3 kpc处达到峰值,平均初速度为380^{+40}_{-60} km/s;出生自旋周期分布延伸到几百毫秒,没有多模态的证据,这意味着特征年龄高估了真实年龄的中位数因子>2的真实年龄<30,000年;其中双星的射电光度是随机的模型一般不能再现观测到的P-Pdot图,这表明了内在射电光度与(P,Pdot)之间的关系;射电光度L Edot ^[0.5]与观测到的P-Pdot图有很好的匹配;对于这种有利的射电光度模型,我们没有发现证据表明,在作为射电源~ 1亿年的时间里,磁中子星的寿命中有显著的磁场衰减。

英文摘要:

We investigate the birth and evolution of isolated radio pulsars using a population synthesis method, modeling the birth properties of the pulsars, their time evolution, and their detection in the Parkes and Swinburne Multibeam (MB) surveys. Together, the Parkes and Swinburne MB surveys have detected nearly 2/3 of the known pulsars and provide a remarkably homogeneous sample to compare with simulations. New proper motion measurements and an improved model of the distribution of free electrons in the interstellar medium, NE2001, also make revisiting these issues particularly worthwhile. We present a simple population model that reproduces the actual observations well, and consider others that fail. We conclude that: pulsars are born in the spiral arms, with the birthrate of 2.8+/-0.5 pulsars/century peaking at a distance ~3 kpc from the Galactic centre, and with mean initial speed of 380^{+40}_{-60} km/s; the birth spin period distribution extends to several hundred milliseconds, with no evidence of multimodality, implying that characteristic ages overestimate the true ages of the pulsars by a median factor >2 for true ages <30,000 yr; models in which the radio luminosities of the pulsars are random generically fail to reproduce the observed P-Pdot diagram, suggesting a relation between intrinsic radio luminosity and (P, Pdot); radio luminosities L Edot^0.5 provide a good match to the observed P-Pdot diagram; for this favored radio luminosity model, we find no evidence for significant magnetic field decay over the lifetime of the pulsars as radio sources ~100 Myr.

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