KMS National Astronomical Observatories, CAS
The Influences of the Velocity Distribution and the Thickness Effect of Galactic Disk on the Z-distribution of Normal Pulsars | |
Wei Yingchun1; Peng Qiuhe2; Wu Xinji3; Zhang Ming2; Wang Na1; Zhou Zhigang4; A Esamdin1 | |
2007 | |
Source Publication | Chinese Astronomy and Astrophysics |
ISSN | 0275-1062 |
Volume | 31Issue:1Pages:11 |
Abstract | Based on the gravitational potential of an undisturbed finitely-thick disk derived by Peng et al. (1978), 3-D Monte Carlo simulations of 4 × 10 5 pulsars are made for the four combinations of the two parameters of gravitational potential ( h z 1 = 0.001 kpc , h z 2 = 0.325 kpc ) and two parameters of initial velocity distribution ( σ v 1 = 115 km , σ v 2 = 200 km ). The 4 × 10 5 pulsars are divided into 20 age-groups and the fraction of “escaped” pulsars is calculated for each group. The “not escaped” pulsars in each group, whose simulated projective positions on the Galactic plane lie in the two radial ranges 0 < r < 25 kpc and 5 < r < 11 kpc, are selected to construct the | z |-distribution and derive the segmental and cumulative scale heights. The evolution characteristics of the segmental and cumulative scale heights of the “not escaped” pulsars in these two regions are studied. The segmental scale height of the “not escaped” pulsars varies with the time irregularly while the cumulative scale height varies smoothly. For a relatively long time (>10 8 yr), the Galactic disk thickness has an obvious and complex effect on the evolution of the pulsar's cumulative scale height, but for a relatively short time (< 2 × 10 7 ), the effect is very small and the time dependence of the cumulative scale height is linear. Over a long period, the initial velocity distribution also has an obvious influence on the cumulative scale height. In the condition h z 2 = 0.325 kpc and σ v 2 = 200 km , the simulated cumulative scale height is 0.596 ± 0.005 kpc in the radial range 5 < r < 11 kpc and at the time t = 9.22 × 10 6 yr. |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.bao.ac.cn/handle/114a11/40892 |
Collection | 中国科学院国家天文台 |
Affiliation | 1.中国科学院 2.南京大学 3.北京大学 4.中国科学院国家天文台 |
Recommended Citation GB/T 7714 | Wei Yingchun,Peng Qiuhe,Wu Xinji,et al. The Influences of the Velocity Distribution and the Thickness Effect of Galactic Disk on the Z-distribution of Normal Pulsars[J]. Chinese Astronomy and Astrophysics,2007,31(1):11. |
APA | Wei Yingchun.,Peng Qiuhe.,Wu Xinji.,Zhang Ming.,Wang Na.,...&A Esamdin.(2007).The Influences of the Velocity Distribution and the Thickness Effect of Galactic Disk on the Z-distribution of Normal Pulsars.Chinese Astronomy and Astrophysics,31(1),11. |
MLA | Wei Yingchun,et al."The Influences of the Velocity Distribution and the Thickness Effect of Galactic Disk on the Z-distribution of Normal Pulsars".Chinese Astronomy and Astrophysics 31.1(2007):11. |
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