VLBI differential astrometry of the radio sources 1928+738 and 2007+777 at 5 GHz

被引：0

作者：

Guirado, J.C. ^{[1
]}

Marcaide, J.M. ^{[1
,2
,3
]}

Elósegui, P. ^{[1
,3
]}

Ratner, M.I. ^{[3
]}

Shapiro, I.I. ^{[3
]}

Eckart, A. ^{[4
]}

Quirrenbach, A. ^{[4
,5
,6
]}

Schalinski, C.J. ^{[6
,7
]}

Witzel, A. ^{[6
]}

机构：

[1] Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, Granada,E-18080, Spain

[2] Dpto. de Matemática Aplicada y Astronomía, Universitat de València, Burjassot, Valencia,E-46100, Spain

[3] Harvard-Smithsonian Center for Astrophysics, Cambridge,MA,02138, United States

[4] Max Planck Institut für Physik und Astrophysik, Karl-Schwarzschild-Strasse 1, Garching bei München,D-8046, Germany

[5] NRL/USNO Optical Interferometer Project, Universities Space Research Association (USRA), United States

[6] Max Planck Institut für Radioastronomie, Postfach 2024, Bonn,D-53010, Germany

[7] Institut de Radio Astronomie Millimétrique, Domaine Universitaire de Grenoble, St. Martin d'Hères Cedex,F-38406, France

来源：

| 1995年 / EDP Sciences卷 / 293期

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摘要：

From 5 G H z V L B I observations of the quasar 1928+738 and the BL Lac object 2007+777 on 9 October 1985, we have determined their relative position in J2000.Ö to be: (equation presented)The uncertainties quoted are each approximately one statistical standard deviation and correspond to about 0.3 milliarcseconds in right ascension and 0.2 milliarcseconds in declination. This result demonstrates the feasibility of using single-band observations for accurate phase-delay differential astrometry of sources separated by 5° on the sky. The plasma contribution to the phase delay, the potentially limiting source of error in single-band observations, has been estimated from ionospheric total electron content measurements obtained by satellite ground stations and from differences of phase-delay and group-delay observables. © European Southern Observatory

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