Results 101 to 110 of about 165 (125)
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Astrometry of Southern radio sources
Astrophysics and Space Science, 1991An overview is presented of a number of astrometry and astrophysics programs based on radio sources from the Parkes 2.7 GHz catalogues. The programs cover the optical identification and spectroscopy of flat-spectrum Parkes sources and the determination of their milliarc-second radio structures and positions.
John Reynolds +2 more
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Optical astrometry of Benchmark radio sources [PDF]
Astronomy and Astrophysics, 1997 Optical positions relative to the International Reference Stars Catalogue (IRS), and therefore in the sys- tem of the FK5, have been obtained for the optical coun- terparts of 40 compact extragalactic radio sources south of +6. Many of these sources are being consid- ered as possible Benchmark objects for the establishment of a quasi inertial unied ...
Enrico Costa
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Radio astrometry with chromatic AGN core positions [PDF]
Astronomy and Astrophysics, 2009 Accepted for publication in Astronomy & Astrophysics, 4 ...
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Astrometry with Radio Interferometers
2000This chapter summarizes the principles and tools of radio astronomy that ultimately lead to the establishment of a fundamental catalogue via application of the technique of radio interferometry to the measurement of positions of sources at cosmological distances.
Hans G. Walter, Ojars J. Sovers
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Review of radio astrometry I. Radio measurements
International Astronomical Union Colloquium, 1978At the astrometry symposium held at Perth in 1973, the radio astronomers devoted much of their allocated time towards explaining the techniques used in radio astrometry. As further details are available in, for example, the review by Counselman, it now seems appropriate to consider the achievements that have been made since the last symposium.
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The Application of Radio Interferometers in Astrometry
International Astronomical Union Colloquium, 1975AbstractAn account is given of the recent precision measurements of position of radio sources by VLBI and especially phase-stable interferometer systems of the 5 km radio telescope in Cambridge.A brief description of the 5 km. telescope is given as well as some of the remarkably accurate determinations of declination and right ascension of radio ...
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Astrometry and geodesy with radio interferometry: experiments, models, results [PDF]
Reviews of Modern Physics, 1998 83 pages, 19 Postscript figures. To be published in Rev. Mod. Phys., Vol.
Christopher Jacobs
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Monthly Notices of the Royal Astronomical SocietyABSTRACT The alignment between the radio-based International Celestial Reference Frame (ICRF) and the optical Gaia Celestial Reference Frame (Gaia–CRF) is critical for multi-waveband astronomy, yet systematic offsets at the optical bright end ($G \lesssim 13$) limit their consistency.
Fengchun Shu, Wen Chen, Cui Lang
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Review of radio astrometry II. Optical measurements
International Astronomical Union Colloquium, 1978The establishment of an astronomical reference frame which is based on positions of extragalactic objects is an old problem of fundamental astronomy. Radio astrometry has now achieved a level of accuracy, which rivals the best optical work, thus openingexcitingprospects to reach this aim within a relatively short time scale.To take full advantage of ...
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Present status of radio astrometry with baselines ≤ 35 km
International Astronomical Union Colloquium, 1978A summary of results for radio astrometry with baselines ≤ 35 km and priorities for future work are given.
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