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Charge-exchange emission and cold clumps in multiphase galactic outflows
Wu, Kinwah1; Li, Kaye Jiale1,2; Owen, Ellis R.1; Ji, Li3,4; Zhang, Shuinai3,4; Branduardi-Raymont, Graziella1
2020-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume491Issue:4Pages:5621-5635
Corresponding AuthorWu, Kinwah(kinwah.wu@ucl.ac.uk) ; Li, Kaye Jiale(j-li.19@ucl.ac.uk) ; Owen, Ellis R.(ellis.owen.12@ucl.ac.uk)
AbstractLarge-scale outflows from starburst galaxies are multiphase, multicomponent fluids. Charge-exchange lines that originate from the interfacing surface between the neutral and ionized components are a useful diagnostic of the cold dense structures in the galactic outflow. From the charge-exchange lines observed in the nearby starburst galaxy M82, we conduct surface-to-volume analyses and deduce that the cold dense clumps in its galactic outflow have flattened shapes, resembling a hamburger or a pancake morphology rather than elongated shapes. The observed filamentary Ha features are therefore not prime charge-exchange line emitters. They are stripped material torn from the slow-moving dense clumps by the faster moving ionized fluid, which are subsequently warmed and stretched into elongated shapes. Our findings are consistent with numerical simulations that have shown that cold dense clumps in galactic outflows can be compressed by ram pressure, and also progressively ablated and stripped before complete disintegration. We have shown that some clumps could survive their passage along a galactic outflow. These are advected into the circumgalactic environment, where their remnants would seed condensation of the circumgalactic medium to form new clumps. The infall of these new clumps back into the galaxy and their subsequent re-entrainment into the galactic outflow form a loop process of galactic material recycling.
Keywordatomic processes ISM: structure galaxies: individual: M82 galaxies: starburst X-rays: galaxies
DOI10.1093/mnras/stz3301
WOS KeywordX-RAY-EMISSION ; HIGH-VELOCITY CLOUDS ; ON STARBURST GALAXIES ; H-ALPHA EMISSION ; THERMAL CONDUCTION ; FILAMENT FORMATION ; CROSS-SECTIONS ; HYPERELLIPTIC INTEGRALS ; CHANDRA OBSERVATIONS ; DRIVEN OUTFLOWS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000512310600077
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36235
Collection中国科学院紫金山天文台
Corresponding AuthorWu, Kinwah; Li, Kaye Jiale; Owen, Ellis R.
Affiliation1.Univ Coll London, Mullard Space Sci Lab, Holmbury RH5 6NT, Surrey, England
2.Chinese Univ Hong Kong, Dept Phys, Sha Tin, Hong Kong, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Peoples R China
4.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Nanjing 210034, Peoples R China
Recommended Citation
GB/T 7714
Wu, Kinwah,Li, Kaye Jiale,Owen, Ellis R.,et al. Charge-exchange emission and cold clumps in multiphase galactic outflows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,491(4):5621-5635.
APA Wu, Kinwah,Li, Kaye Jiale,Owen, Ellis R.,Ji, Li,Zhang, Shuinai,&Branduardi-Raymont, Graziella.(2020).Charge-exchange emission and cold clumps in multiphase galactic outflows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(4),5621-5635.
MLA Wu, Kinwah,et al."Charge-exchange emission and cold clumps in multiphase galactic outflows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.4(2020):5621-5635.
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