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Revealing two radio-active galactic nuclei extremely near PSR J0437-4715
Li ZX(李志玄)1,2,3; Yang J(杨军)1,4,5; An, Tao5,6; Paragi, Zsolt7; Deller, Adam8; Reynolds, Cormac9; Hong, Xiaoyu5,6; Wang JC(王建成)1,3; Ding, Hao2,5,6; Xia, Bo5,6; Yan, Zhen5,6; Guo, Li5,6; Yang J(杨军), Email: jun.yang@chalmers.se; An, Tao, Email: antao@shao.ac.cn
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-05-01
卷号476期号:1页码:399-406
DOI10.1093/mnras/sty210
产权排序第1完成单位
收录类别SCI
关键词Astrometry Pulsars: Individual: Psr J0437-4715 Galaxies: Jets
摘要Newton's gravitational constant G may vary with time at an extremely low level. The time variability of G will affect the orbital motion of a millisecond pulsar in a binary system and cause a tiny difference between the orbital period-dependent measurement of the kinematic distance and the direct measurement of the annual parallax distance. PSR J0437-4715 is the nearest millisecond pulsar and the brightest at radio wavelengths. To explore the feasibility of achieving a parallax distance accuracy of one light-year, comparable to the recent timing result, with the technique of differential astrometry, we searched for compact radio sources quite close to PSR J0437-4715. Using existing data from the Very Large Array and the Australia Telescope Compact Array, we detected two sources with flat spectra, relatively stable flux densities of 0.9 and 1.0 mJy at 8.4 GHz and separations of 13 and 45 arcsec. With a network consisting of the Long Baseline Array and the Kunming 40-m radio telescope, we found that both sources have a point-like structure and a brightness temperature of >= 10(7) K. According to these radio inputs and the absence of counterparts in other bands, we argue that they are most likely the compact radio cores of extragalactic active galactic nuclei, rather than Galactic radio stars. The finding of these two radio active galactic nuclei will enable us to achieve a sub-pc distance accuracy with in-beam phase-referencing very-long-baseline interferometric observations and provide one of the most stringent constraints on the time variability of G in the near future.
项目资助者Ministry of Science and Technology of China(2016YFE0100300) ; Chinese Academy of Sciences (CAS) ; Youth Innovation Promotion Association of CAS ; FAST Fellowship ; Centre for Astronomical Mega-Science, CAS ; Australian Government
语种英语
学科领域天文学
文章类型Article
ISSN0035-8711
URL查看原文
WOS记录号WOS:000429276700032
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]PRECISION VLBI ASTROMETRY ; RADIO-SOURCES ; MILLISECOND PULSAR ; 1ST SURVEY ; TELESCOPE ; DISCOVERY ; CATALOG ; BRIGHT ; MOTION ; SDSS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12308
专题射电天文研究组
中国科学院天体结构与演化重点实验室
通讯作者Yang J(杨军), Email: jun.yang@chalmers.se; An, Tao, Email: antao@shao.ac.cn
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, 650216 Kunming, Yunnan, China
2.University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, 100049 Beijing, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216 Kunming, China
4.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden
5.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 200030 Shanghai, China
6.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 210009 Nanjing, China
7.Joint Institute for VLBI ERIC (JIVE), Postbus 2, NL-7990 AA Dwingeloo, the Netherlands
8.Centre for Astrophysics, and Supercomputing, Swinburne University of Technology, John St, Hawthorn, VIC 3122, Australia
9.CSIRO Astronomy and Space Science, Kensington, WA 6151, Australia
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Li ZX,Yang J,An, Tao,et al. Revealing two radio-active galactic nuclei extremely near PSR J0437-4715[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,476(1):399-406.
APA Li ZX.,Yang J.,An, Tao.,Paragi, Zsolt.,Deller, Adam.,...&An, Tao, Email: antao@shao.ac.cn.(2018).Revealing two radio-active galactic nuclei extremely near PSR J0437-4715.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,476(1),399-406.
MLA Li ZX,et al."Revealing two radio-active galactic nuclei extremely near PSR J0437-4715".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 476.1(2018):399-406.
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