Constraining the Magnetic Field in the TeV Halo of Geminga with X-Ray Observations
文献类型：期刊论文
| 作者 | Liu, Ruo-Yu1; Ge, Chong2,3; Sun, Xiao-Na4; Wang, Xiang-Yu4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-04-20 |
| 卷号 | 875期号:2页码:10 |
| ISSN号 | 0004-637X |
| 关键词 | gamma rays: general pulsars: individual (Geminga) radiation mechanisms: non-thermal X-rays: general |
| DOI | 10.3847/1538-4357/ab125c |
| 通讯作者 | Liu, Ruo-Yu() |
| 英文摘要 | Recently, the High Altitude Water Cherenkov (HAWC) collaboration reported the discovery of a TeV halo around the Geminga pulsar. The TeV emission is believed to originate from the inverse Compton scattering of pulsar-injected electrons/positrons off cosmic microwave background photons. During this time, these electrons should inevitably radiate X-ray photons via synchrotron radiation, providing a useful constraint on the magnetic field in the TeV halo. In this work, we analyze the data of XMM-Newton and Chandra, and obtain an upper limit for the diffuse X-ray flux in a 600 '' region around the Geminga pulsar, which is at a level of less than or similar to 10(-14) erg cm(-2)s(-1). By numerically modeling both the X-ray and TeV observations assuming the isotropic diffusion of injected electrons/ positrons, we find that the magnetic field inside the TeV halo is required to be <1 mu G, which is significantly weaker than the typical magnetic field in the interstellar medium. The weak magnetic field together with the small diffusion coefficient inferred from the HAWC observation implies that the Bohm limit of particle diffusion may probably have been achieved in the TeV halo. We also discuss alternative possibilities for the weak X-ray emission, such as the hadronic origin of the TeV emission or a specific magnetic field topology, in which a weak magnetic field and a very small diffusion coefficient might be avoided. |
| WOS关键词 | POSITRON FLUX ; PULSAR ; RADIATION ; SPECTRA ; ORIGIN |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000465974900018 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/24617]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Liu, Ruo-Yu |
| 作者单位 | 1.Deutsch Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Alabama, Dept Phys & Astron, Huntsville, AL 35899 USA 4.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Ruo-Yu,Ge, Chong,Sun, Xiao-Na,et al. Constraining the Magnetic Field in the TeV Halo of Geminga with X-Ray Observations[J]. ASTROPHYSICAL JOURNAL,2019,875(2):10. |
| APA | Liu, Ruo-Yu,Ge, Chong,Sun, Xiao-Na,&Wang, Xiang-Yu.(2019).Constraining the Magnetic Field in the TeV Halo of Geminga with X-Ray Observations.ASTROPHYSICAL JOURNAL,875(2),10. |
| MLA | Liu, Ruo-Yu,et al."Constraining the Magnetic Field in the TeV Halo of Geminga with X-Ray Observations".ASTROPHYSICAL JOURNAL 875.2(2019):10. |
入库方式： OAI收割
来源：紫金山天文台
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