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SPECTRAL MODELING OF THE CHARGE-EXCHANGE X-RAY EMISSION FROM M82
Zhang, Shuinai1,2; Wang, Q. Daniel3; Ji, Li1,2; Smith, Randall K.4; Foster, Adam R.4; Zhou, Xin1,5
2014-10-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume794Issue:1Pages:0
AbstractIt 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.
KeywordGalaxies: Individual (M82) Galaxies: Starburst X-rays: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/794/1/61
WOS KeywordSTARBURST GALAXY M82 ; REFLECTION GRATING SPECTROMETER ; H-ALPHA EMISSION ; GALACTIC WINDS ; INTERSTELLAR-MEDIUM ; XMM-NEWTON ; CHANDRA OBSERVATIONS ; HOT GAS ; NGC 253 ; SUPERWINDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000342581200061
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10549
Collection暗物质和空间天文实验室
Affiliation1.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
Recommended Citation
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.
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