| Gamma-ray emission properties from mature pulsars in the galaxy and in the Gould Belt | |
Cheng, KS1; Zhang L(张力)2,3 ; Leung, P1; Jiang, ZJ3; Cheng, KS (reprint author), Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2004-06-10 | |
| 卷号 | 608期号:1页码:418-426 |
| DOI | 10.1086/386537 |
| 产权排序 | 第2完成单位 |
| 收录类别 | SCI |
| 关键词 | Gamma Rays : Theory Pulsars : General Stars : Neutron Stars : Statistics |
| 摘要 | We study the gamma-ray emission properties of pulsars by using a new self-consistent outer gap model. The outer gap can exist in pulsars older than 1 million yr if the effect of magnetic inclination angle, as well as the average properties of the outer gap, are considered. The mature gamma-ray pulsars, whose ages are between 0.3 and 3 million yr, are able to move up to high Galactic latitude. Moreover, their gamma-ray luminosities are weaker, and their spectra are significantly softer than those of younger gamma-ray pulsars in the Galactic plane. We use a Monte Carlo method to simulate the statistical properties of gamma-ray pulsars in the Galaxy as well as in the Gould Belt. We find that gamma-ray pulsars located at \b\ < 5&DEG; and &VERBAR;b&VERBAR; > 5degrees have very different properties. High Galactic latitude gamma-ray pulsars are dominated by mature pulsars with longer periods, weaker fluxes, and softer spectra. If the pulsar birth rates in the Galaxy and the Gould Belt are similar to10(-2) and similar to2 x 10(-5) yr(-1), respectively, there are 42 and 35 radio-quiet gamma-ray pulsars for \b\ < 5&DEG; and &VERBAR;b&VERBAR; > 5degrees, respectively. The number of radio-quiet gamma-ray pulsars from the GouldBelt are 2 and 13 for \b\ < 5&DEG; and &VERBAR;b&VERBAR; > 5degrees, respectively. We suggest that a good fraction of unidentified EGRET gamma-ray sources may be these radio-quiet gamma-ray pulsars. Furthermore, gamma-ray pulsars located at \b\ > 5degrees satisfy L-gamma proportional to L-sd(beta), whereas L-gamma proportional to L-sd(delta) for gamma-ray pulsars in the Galactic plane, where beta similar to 0.6 and delta similar to 0.3, respectively. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:000221881200036 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | UNIDENTIFIED EGRET SOURCES ; RAPIDLY SPINNING PULSARS ; ISOLATED NEUTRON-STAR ; 3EG J1835+5918 ; YOUNG PULSARS ; ENERGETIC RADIATION ; PAIR FORMATION ; RADIO PULSARS ; OUTER GAPS ; POLAR CAPS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4178 |
| 专题 | 其他 |
| 通讯作者 | Cheng, KS (reprint author), Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China. |
| 作者单位 | 1.Department of Physics, the University of Hong Kong, Hong Kong, People's Republic of China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, People's Republic of China 3.Department of Physics, Yunnan University, Kunming, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Cheng, KS,Zhang L,Leung, P,et al. Gamma-ray emission properties from mature pulsars in the galaxy and in the Gould Belt[J]. ASTROPHYSICAL JOURNAL,2004,608(1):418-426. |
| APA | Cheng, KS,Zhang L,Leung, P,Jiang, ZJ,&Cheng, KS .(2004).Gamma-ray emission properties from mature pulsars in the galaxy and in the Gould Belt.ASTROPHYSICAL JOURNAL,608(1),418-426. |
| MLA | Cheng, KS,et al."Gamma-ray emission properties from mature pulsars in the galaxy and in the Gould Belt".ASTROPHYSICAL JOURNAL 608.1(2004):418-426. |
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