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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
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-05-01
Volume476Issue:1Pages:399-406
DOI10.1093/mnras/sty210
Contribution Rank第1完成单位
Indexed BySCI
KeywordAstrometry Pulsars: Individual: Psr J0437-4715 Galaxies: Jets
Abstract

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.

Funding ProjectMinistry 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
Funding OrganizationMinistry 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
Language英语
Subject Area天文学 ; 射电天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000429276700032
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordPRECISION VLBI ASTROMETRY ; RADIO-SOURCES ; MILLISECOND PULSAR ; 1ST SURVEY ; TELESCOPE ; DISCOVERY ; CATALOG ; BRIGHT ; MOTION ; SDSS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12308
Collection射电天文研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorYang J(杨军); An, Tao
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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.,...&Guo, Li.(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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