Results 1 to 10 of about 909 (203)
The Radio Fundamental Catalog. I. Astrometry
The Astrophysical Journal Supplement SeriesWe present an all-sky catalog of absolute positions and estimates of correlated flux density of 21,942 compact radio sources determined from processing interferometric visibility data of virtually all very long baseline interferometry (VLBI) observing ...
L. Y. Petrov, Y. Y. Kovalev
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Microarcsecond Radio Astrometry [PDF]
Annual Review of Astronomy and Astrophysics, 2014 Astrometry provides the foundation for astrophysics. Accurate positions are required for the association of sources detected at different times or wavelengths, and distances are essential to estimate the size, luminosity, mass, and ages of most objects.
Reid, M. J., Honma, M.
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Radio astrometry with chromatic AGN core positions [PDF]
Astronomy and Astrophysics, 2009 Accepted for publication in Astronomy & Astrophysics, 4 ...
R W Porcas
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Radio Astrometry at Different Frequencies
The Astronomical JournalThe very long baseline interferometry technique allows us to determine the positions of thousands of radio sources using the absolute astrometry approach. I have investigated the impacts of a selection of observing frequencies in a range from 2 to 43 GHz
Leonid Petrov
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VLBI MultiView Astrometry of Radio Stars [PDF]
Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022), 2023 The expected emission mechanisms for radio loud M dwarfs include plasma emission, gyrosynchrotron emission during short lived (<2 hrs) flares, and Electron Cyclotron Maser Instability (ECMI) which can occur in planetary aurorae, and interaction between a star and a planetary companion.
Boven, E.P. +3 more
openaire +4 more sources
Demonstration of Ultrawideband Polarimetry Using VLBI Exploration of Radio Astrometry (VERA)
Galaxies, 2022 We report on recent technical developments in the front- and back-ends for the four 20 m radio telescopes of the Japanese Very-Long-Baseline Interferometry (VLBI) project, VLBI Exploration of Radio Astrometry (VERA). We present a brief overview of a dual-
Yoshiaki Hagiwara +5 more
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Precise radio astrometry and new developments for the next generation of instruments [PDF]
Astronomy and Astrophysics Review, 2020 We present a technique-led review of the progression of precise radio astrometry, from the first demonstrations, half a century ago, until to date and into the future. We cover the developments that have been fundamental to allow high accuracy and precision astrometry to be regularly achieved. We review the opportunities provided by the next-generation
Maria J Rioja, R Dodson, Rioja Maria J
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RADIO ASTROMETRY OF THE TRIPLE SYSTEMS ALGOL AND UX ARIETIS [PDF]
The Astrophysical Journal, 2011 We have used multi-epoch long-baseline radio interferometry to determine the proper motion and orbital elements of Algol and UX Arietis, two radio-bright, close binary stellar systems with distant tertiary components. For Algol, we refine the proper motion and outer orbit solutions, confirming the recent result of Zavala et al.
Peterson, W. M. +4 more
core +7 more sources
Optical astrometry of Benchmark radio sources [PDF]
Astronomy and Astrophysics Supplement Series, 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 ...
Costa Hechenleitner, Edgardo, Loyola, P.
openaire +2 more sources
An Updated View of the Milky Way from Maser Astrometry
Universe, 2022 Astrometric observations of maser sources in the Milky Way, using the Very Long Baseline Interferometry (VLBI) technique, have been exploited to determine the spiral structure of our Galaxy. Several major spiral arms have now been pinpointed in the first
Katharina Immer, Kazi L. J. Rygl
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