中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 紫金山天文台
  3. 中国科学院紫金山天文台
Revealing two radio-active galactic nuclei extremely near PSR J0437-4715

文献类型：期刊论文

作者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
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2018-05-01
卷号476期号:1页码:399-406
关键词astrometry pulsars: individual: PSR J0437-4715 galaxies: jets
ISSN号0035-8711
DOI10.1093/mnras/sty210
通讯作者Yang, Jun(jun.yang@chalmers.se) ; An, Tao(antao@shao.ac.cn)
英文摘要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.
WOS关键词PRECISION VLBI ASTROMETRY ; RADIO-SOURCES ; MILLISECOND PULSAR ; 1ST SURVEY ; TELESCOPE ; DISCOVERY ; CATALOG ; BRIGHT ; MOTION ; SDSS
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000429276700032
出版者OXFORD UNIV PRESS
源URL[http://libir.pmo.ac.cn/handle/332002/22457]  
专题中国科学院紫金山天文台
通讯作者Yang, Jun; An, Tao
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：紫金山天文台

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。