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The High-frequency Radio Emission of the Galactic Center Magnetar SGR J1745-29 during a Transitional Period
Gelfand, Joseph D.1,2; Ransom, Scott3; Kouveliotou, Chryssa4,5; Granot, Jonathan6; van der Horst, Alexander J.4,5; Zhang GB(张国宝)1,8,9,10; Gogus, Ersin7; Roberts, Mallory S. E.1; Al Ali, Hend1
Source PublicationASTROPHYSICAL JOURNAL
2017-11-20
Volume850Issue:1
DOI10.3847/1538-4357/aa9436
Contribution Rank第8完成单位
Indexed BySCI
KeywordPulsars: Individual (J1745-29) Radio Continuum: General Stars: Magnetars
Abstract

The origin of the high-frequency radio emission detected from several magnetars is poorly understood. In this paper, we report the similar to 40 GHz properties of SGR J1745-29 measured using Jansky Very Large Array (JVLA) and Robert C. Byrd Green Bank Telescope (GBT) observations between 2013 October 26 and 2014 May 31. Our analysis of a Q-band (45GHz) GBT observation on 2014 April 10 resulted in the earliest detection of pulsed radio emission at high frequencies (greater than or similar to 20 GHz); we found that the average pulse has a singly peaked profile with width similar to 75 ms (similar to 2% of the 3.764 s pulse period) and an average pulsed flux density of similar to 100 mJy. We also detected very bright, short (< 10 ms) single pulses during similar to 70% of this neutron star's rotations, and the peak flux densities of these bright pulses follow the same log-normal distribution as measured at 8.5 GHz. Additionally, our analysis of contemporaneous JVLA observations suggest that its 41/44 GHz flux density varied between similar to 1-4mJy during this period, with a similar to 2 x change observed on similar to 20. minute timescales during a JVLA observation on 2014 May 10. Such a drastic change over short timescales is inconsistent with the radio emission resulting from a shock powered by the magnetar's supersonic motion through the surrounding medium, but consistent with pulsed emission generated in its magnetosphere.

Funding ProjectNYU Abu Dhabi[RE022]
Funding OrganizationNYU Abu Dhabi[RE022]
Language英语
Subject Area天文学 ; 射电天文学 ; 星系与宇宙学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000415841400005
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSagittarius A-asterisk ; Xte J1810-197 ; Transient Magnetar ; Pulsar ; Electrodynamics ; Discovery ; Spectrum ; Array ; Field
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11963
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorGelfand, Joseph D.
Affiliation1.NYU Abu Dhabi, United Arab Emirates
2.NYU Center for Cosmology and Particle Physics, New York, NY 10003, USA
3.NRAO, USA
4.The George Washington University, USA
5.Astronomy, Physics and Statistics Institute of Sciences (APSIS), Washington, DC 20052, USA
6.The Open University of Israel, Israel
7.Sabancı University, Turkey
8.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
9.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
10.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
Recommended Citation
GB/T 7714
Gelfand, Joseph D.,Ransom, Scott,Kouveliotou, Chryssa,et al. The High-frequency Radio Emission of the Galactic Center Magnetar SGR J1745-29 during a Transitional Period[J]. ASTROPHYSICAL JOURNAL,2017,850(1).
APA Gelfand, Joseph D..,Ransom, Scott.,Kouveliotou, Chryssa.,Granot, Jonathan.,van der Horst, Alexander J..,...&Al Ali, Hend.(2017).The High-frequency Radio Emission of the Galactic Center Magnetar SGR J1745-29 during a Transitional Period.ASTROPHYSICAL JOURNAL,850(1).
MLA Gelfand, Joseph D.,et al."The High-frequency Radio Emission of the Galactic Center Magnetar SGR J1745-29 during a Transitional Period".ASTROPHYSICAL JOURNAL 850.1(2017).
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