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Revealing two radio-active galactic nuclei extremely near PSR J0437-4715
Li, Zhixuan1,2,3; Yang, Jun1,4,5; An, Tao5,6; Paragi, Zsolt7; Deller, Adam8; Reynolds, Cormac9; Hong, Xiaoyu5,6; Wang, Jiancheng1,3; Ding, Hao2,5,6; Xia, Bo5,6; Yan, Zhen5,6; Guo, Li5,6
2018-05-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume476Issue:1Pages:399-406
Corresponding AuthorYang, Jun(jun.yang@chalmers.se) ; An, Tao(antao@shao.ac.cn)
AbstractNewton'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.
Keywordastrometry pulsars: individual: PSR J0437-4715 galaxies: jets
DOI10.1093/mnras/sty210
WOS KeywordPRECISION VLBI ASTROMETRY ; RADIO-SOURCES ; MILLISECOND PULSAR ; 1ST SURVEY ; TELESCOPE ; DISCOVERY ; CATALOG ; BRIGHT ; MOTION ; SDSS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000429276700032
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22458
Collection中国科学院紫金山天文台
Corresponding AuthorYang, Jun; An, Tao
Affiliation1.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China
4.Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, SE-43992 Onsala, Sweden
5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
6.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210009, Jiangsu, Peoples R China
7.Joint Inst VLBI ERIC JIVE, Postbus 2, NL-7990 AA Dwingeloo, Netherlands
8.Swinburne Univ Technol, Ctr Astrophys & Supercomp, John St, Hawthorn, Vic 3122, Australia
9.CSIRO Astron & Space Sci, Kensington, WA 6151, Australia
Recommended Citation
GB/T 7714
Li, Zhixuan,Yang, Jun,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, Zhixuan.,Yang, Jun.,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, Zhixuan,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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