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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
发表期刊ASTROPHYSICAL JOURNAL
2017-11-20
卷号850期号:1
DOI10.3847/1538-4357/aa9436
产权排序第8完成单位
收录类别SCI
关键词Pulsars: Individual (J1745-29) Radio Continuum: General Stars: Magnetars
摘要

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.

项目资助者NYU Abu Dhabi(RE022)
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
ISSN0004-637X
URL查看原文
WOS记录号WOS:000415841400005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Sagittarius A-asterisk ; Xte J1810-197 ; Transient Magnetar ; Pulsar ; Electrodynamics ; Discovery ; Spectrum ; Array ; Field
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11963
专题丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
通讯作者Gelfand, Joseph D.
作者单位1.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
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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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