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The Nearby Luminous Transient AT2018cow: A Magnetar Formed in a Subrelativistically Expanding Nonjetted Explosion
Mohan, P.1; An, T.1,2; Yang, J.1,3
2020-01-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume888Issue:2Pages:9
Corresponding AuthorMohan, P.(pmohan@shao.ac.cn)
AbstractThe fast-rising blue optical transient AT2018cow indicated unusual early-phase characteristics unlike relatively better studied explosive transients. Its afterglow may be produced by either a relativistically beamed (jetted) or intrinsically luminous (nonjetted) ejecta and carries observational signatures of the progenitor and environment. High-resolution monitoring can distinguish between these scenarios and clarify the progenitor nature. We present very long baseline interferometry (VLBI) observations of AT2018cow at 5 GHz involving 21 radio telescopes from the European VLBI Network with five sessions spanning 1 yr. With an astrometric precision up to 25 mu as per epoch, the rapidly fading compact mas-scale source is found to be nonjetted with a proper motion of <= 0.15 mas yr(-1) (0.14 c). This and a dense (number density 10(4)-10(5) cm(-3)) magnetized environment (magnetic field strength >= 0.84 G) are characteristic of a newly formed magnetar driven central engine, originating in the successful explosion of a low-mass star.
KeywordTransient sources High energy astrophysics Very long baseline interferometry Magnetars Burst astrophysics
DOI10.3847/2041-8213/ab64d1
WOS KeywordFAST RADIO-BURSTS ; SUPERNOVA ; DISRUPTION ; AFTERGLOW ; EMISSION ; MOTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000520969800001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35856
Collection中国科学院紫金山天文台
Corresponding AuthorMohan, P.
Affiliation1.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
3.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden
Recommended Citation
GB/T 7714
Mohan, P.,An, T.,Yang, J.. The Nearby Luminous Transient AT2018cow: A Magnetar Formed in a Subrelativistically Expanding Nonjetted Explosion[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,888(2):9.
APA Mohan, P.,An, T.,&Yang, J..(2020).The Nearby Luminous Transient AT2018cow: A Magnetar Formed in a Subrelativistically Expanding Nonjetted Explosion.ASTROPHYSICAL JOURNAL LETTERS,888(2),9.
MLA Mohan, P.,et al."The Nearby Luminous Transient AT2018cow: A Magnetar Formed in a Subrelativistically Expanding Nonjetted Explosion".ASTROPHYSICAL JOURNAL LETTERS 888.2(2020):9.
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