The Bending Feature of the Fermi Bubbles: A Presumed Horizontal Galactic Wind and Its Implication on the Bubbles' Age
文献类型：期刊论文
| 作者 | Mou, Guobin2,3; Sun, Dongze1; Xie, Fuguo2 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2018-12-10 |
| 卷号 | 869期号:1页码:6 |
| 关键词 | galaxies: active gamma-rays: galaxies ISM: jets and outflows X-rays: galaxies |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/aaf421 |
| 英文摘要 | There are two spectacular structures in our Milky Way: the Fermi bubbles in gamma-ray observations and the North Polar Spur (NPS) structure in X-ray observations. Because of their morphological similarities, they may share the same origin, i.e., related to the past activity of Galactic center. These structures demonstrate a significant bending feature toward the west in Galactic coordinates. This inspires us to consider the possibility that the bending may be caused by a presumed global horizontal galactic wind (HGW) blowing from the east to the west. Under this assumption, we adopt a toy shock-expansion model to understand two observational features: (1) the relative thickness of the NPS; (2) the bending of the Fermi bubbles and the NPS. In this model, the contact discontinuity marks the boundary of the Fermi bubbles, and the shocked interstellar medium (ISM) marks the NPS X-ray structure. We find that the Mach number of the forward shock in the east is similar to 1.9-2.3, and the velocity of the HGW is similar to 0.7-0.9c(s). Depending on the temperature of the pre-shock ISM, the velocity of the expanding NPS in Galactic coordinates is around 180-290 km s(-1), and the HGW is similar to 110-190 km s(-1). We argue that the age of the NPS and the Fermi bubbles is about 18-34 Myr. This is a novel method, independent of injection theories and radiative mechanisms, for the estimation on the age of the Fermi bubble/NPS. |
| 资助项目 | Natural Science Foundation of China[11703022] ; Natural Science Foundation of China[11833007] ; Natural Science Foundation of China[11873074] ; Natural Science Foundation of China[11622326] ; National Program on Key Research and Development Project[2016YFA0400803] ; Fundamental Research Funds for the Central Universities ; National Program on Key R&D Project of China[2016YFA0400804] ; Youth Innovation Promotion Association of CAS (CAS)[2016243] ; Natural Science Foundation of Shanghai[17ZR1435800] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000453050100001 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://119.78.226.72/handle/331011/32043]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Mou, Guobin |
| 作者单位 | 1.Wuhan Univ, HongYi Honor Coll, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 3.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mou, Guobin,Sun, Dongze,Xie, Fuguo. The Bending Feature of the Fermi Bubbles: A Presumed Horizontal Galactic Wind and Its Implication on the Bubbles' Age[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,869(1):6. |
| APA | Mou, Guobin,Sun, Dongze,&Xie, Fuguo.(2018).The Bending Feature of the Fermi Bubbles: A Presumed Horizontal Galactic Wind and Its Implication on the Bubbles' Age.ASTROPHYSICAL JOURNAL LETTERS,869(1),6. |
| MLA | Mou, Guobin,et al."The Bending Feature of the Fermi Bubbles: A Presumed Horizontal Galactic Wind and Its Implication on the Bubbles' Age".ASTROPHYSICAL JOURNAL LETTERS 869.1(2018):6. |
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来源：上海天文台
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