SPECTRAL MODELING OF THE CHARGE-EXCHANGE X-RAY EMISSION FROM M82
文献类型：期刊论文
| 作者 | Zhang, Shuinai1,2; Wang, Q. Daniel3; Ji, Li1,2 ; Smith, Randall K.4; Foster, Adam R.4; Zhou, Xin1,5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-10-10 |
| 卷号 | 794期号:1页码:0 |
| 关键词 | galaxies: individual (M82) galaxies: starburst X-rays: galaxies |
| ISSN号 | 0004-637X |
| 英文摘要 | It has been proposed that the charge-exchange (CX) process at the interface between hot and cool interstellar gases could contribute significantly to the observed soft X-ray emission in star-forming galaxies. We analyze the XMM-Newton/reflection grating spectrometer (RGS) spectrum of M82 using a newly developed CX model combined with a single-temperature thermal plasma to characterize the volume-filling hot gas. The CX process is largely responsible for not only the strongly enhanced forbidden lines of the Ka triplets of various He-like ions but also good fractions of the Ly alpha transitions of C (similar to 87%), 0 VIII, and N VII (>= 50%) as well. In total about a quarter of the X-ray flux in the RGS 6-30 angstrom band originates in the CX. We infer an ion incident rate of 3 x 10(51) s(-1) undergoing CX at the hot and cool gas interface and an effective area of the interface of 2 x 1045 cm2 that is one order of magnitude larger than the cross section of the global biconic outflow. With the CX contribution accounted for, the best-fit temperature of the hot gas is 0.6 keV, and the metal abundances are approximately solar. We further show that the same CX/thermal plasma model also gives an excellent description of the EPIC-pn spectrum of the outflow Cap, projected at 11.6 kpc away from the galactic disk of M82. This analysis demonstrates that the CX is potentially an important contributor to the X-ray emission from starburst galaxies and also an invaluable tool to probe the interface astrophysics. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STARBURST GALAXY M82 ; REFLECTION GRATING SPECTROMETER ; H-ALPHA EMISSION ; GALACTIC WINDS ; INTERSTELLAR-MEDIUM ; XMM-NEWTON ; CHANDRA OBSERVATIONS ; HOT GAS ; NGC 253 ; SUPERWINDS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000342581200061 |
| 公开日期 | 2014-11-20 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10549]  |
| 专题 | 紫金山天文台_暗物质和空间天文实验室 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Shuinai,Wang, Q. Daniel,Ji, Li,et al. SPECTRAL MODELING OF THE CHARGE-EXCHANGE X-RAY EMISSION FROM M82[J]. ASTROPHYSICAL JOURNAL,2014,794(1):0. |
| APA | Zhang, Shuinai,Wang, Q. Daniel,Ji, Li,Smith, Randall K.,Foster, Adam R.,&Zhou, Xin.(2014).SPECTRAL MODELING OF THE CHARGE-EXCHANGE X-RAY EMISSION FROM M82.ASTROPHYSICAL JOURNAL,794(1),0. |
| MLA | Zhang, Shuinai,et al."SPECTRAL MODELING OF THE CHARGE-EXCHANGE X-RAY EMISSION FROM M82".ASTROPHYSICAL JOURNAL 794.1(2014):0. |
入库方式： OAI收割
来源：紫金山天文台
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