NAOC Open IR
Tiny-scale Structure Discovered toward PSR B1557-50
Liu, Mengting1,2; Krco, Marko1; Li, Di1,2,3; Hobbs, George4; Dawson, J. R.4,5,6; Heiles, Carl7; Jameson, Andrew8,9; Stanimirovic, Snezana10; Johnston, Simon4; Dickey, John M.11
2021-04-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume911Issue:1Pages:9
AbstractOptical depth variations in the Galactic neutral interstellar medium (ISM) with spatial scales from hundreds to thousands of astronomical units have been observed through H i absorption against pulsars and continuum sources, while extremely small structures with spatial scales of tens of astronomical units remain largely unexplored. The nature and formation of such tiny-scale atomic structures (TSAS) need to be better understood. We report a tentative detection of TSAS with a signal-to-noise ratio of 3.2 toward PSR B1557-50 in the second epoch of two Parkes sessions just 0.36 yr apart, which are the closest-spaced spectral observations toward this pulsar. One absorption component showing marginal variations has been identified. Based on the pulsar's proper motion of 14 mas yr(-1) and the component's kinematic distance of 3.3 kpc, the corresponding characteristic spatial scale is 17 au, which is among the smallest sizes of known TSAS. Assuming a similar line-of-sight (LOS) depth, the tentative TSAS cloud detected here is overdense and overpressured relative to the cold neutral medium (CNM), and can radiatively cool fast enough to be in thermal equilibrium with the ambient environment. We find that turbulence is not sufficient to confine the overpressured TSAS. We explore the LOS elongation that would be required for the tentative TSAS to be at the canonical CNM pressure, and find that it is similar to 5000-much larger than filaments observed in the ISM. We see some evidence of line width and temperature variations in the CNM components observed at the two epochs, as predicted by models of TSAS-like cloud formation colliding warm neutral medium flows.
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship
DOI10.3847/2041-8213/abef6e
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[11988101] ; National Natural Science Foundation of China (NSFC)[11725313] ; National Natural Science Foundation of China (NSFC)[11690024] ; CAS[114-A11KYSB20160008] ; National Key R&D Program of China[2017YFA0402600] ; Australian Research Council (ARC) DECRA Fellowship[DE170101086]
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; CAS ; CAS ; National Key R&D Program of China ; National Key R&D Program of China ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000641565300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78252
Collection中国科学院国家天文台
Corresponding AuthorLiu, Mengting
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ KwaZulu Natal, NAOC UKZN Computat Astrophys Ctr, ZA-4000 Durban, South Africa
4.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
5.Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
6.Macquarie Univ, MQ Res Ctr Astron Astrophys & Astrophoton, N Ryde, NSW 2109, Australia
7.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA
8.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia
9.Australia Res Council Ctr Excellence Gravitat Wav, Hawthorn, Vic, Australia
10.Univ Wisconsin Madison, Dept Astron, Madison, WI 53706 USA
11.Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia
Recommended Citation
GB/T 7714
Liu, Mengting,Krco, Marko,Li, Di,et al. Tiny-scale Structure Discovered toward PSR B1557-50[J]. ASTROPHYSICAL JOURNAL LETTERS,2021,911(1):9.
APA Liu, Mengting.,Krco, Marko.,Li, Di.,Hobbs, George.,Dawson, J. R..,...&Dickey, John M..(2021).Tiny-scale Structure Discovered toward PSR B1557-50.ASTROPHYSICAL JOURNAL LETTERS,911(1),9.
MLA Liu, Mengting,et al."Tiny-scale Structure Discovered toward PSR B1557-50".ASTROPHYSICAL JOURNAL LETTERS 911.1(2021):9.
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