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IC 133 water vapor maser
We report on the results of a 14yr long VLBI study of proper motions in the IC 133 H_2_O maser source in the galaxy M33. -
W49N H2O masers
VLBI observations of a H2O maser were done at five epochs in 1980-82 with a 5 station VLBI network (see 1992ApJ...393..149G). A model was fitted to each peak in any spectral... -
Candidate ICRF flat-spectrum radio sources. III.
In extending our spectroscopic program, which targets sources drawn from the International Celestial Reference Frame (ICRF) Catalog, we have obtained spectra for ~160 compact,... -
Second epoch VLBA Calibrator Survey (VCS-II)
Six very successful Very Long Baseline Array (VLBA) calibrator survey campaigns were run between 1994 and 2007 to build up a large list of compact radio sources with positions... -
VLBI ICRF2
We present the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths using nearly 30 years of Very Long Baseline Interferometry... -
Optically Bright extragalactic Radio Sources II
Future space-borne astrometry missions, such as Gaia, will be able to determine the optical positions of hundreds of quasars with submilliarcsecond accuracies comparable to... -
Spectroscopy of 120 emission-line ICRF2 candidates
Continuing our program of spectroscopic observations of International Celestial Reference Frame (ICRF) sources, we present redshifts for 120 quasars and radio galaxies. Data... -
QCAL-1 43 GHz Calibrator Survey
This paper presents the catalog of correlated flux densities in three ranges of baseline projection lengths of 637 sources from a 43GHz (Q band) survey observed with the Korean... -
KCAL VERA 22 GHz calibrator survey
We observed at 22GHz with the VLBI array VERA a sample of 1536 sources with correlated flux densities brighter than 200mJy at 8GHz. One half of target sources has been detected.... -
Precise astrometry with VLBA (VIPS)
We present accurate positions for 857 sources derived from the astrometric analysis of 16 eleven-hour experiments from the Very Long Baseline Array imaging and polarimetry... -
The VLBA Galactic Plane Survey (VGaPS)
We presents accurate absolute positions from a 24 GHz Very Long Baseline Array (VLBA) search for compact extragalactic sources in an area where the density of known calibrators... -
Optically Bright Extragalactic Radio Sources
It is expected that the European Space Agency mission Gaia will make possible to determine coordinates in the optical domain of more than 500,000 quasars. In 2006, a radio... -
Celestial Reference Frame at 24 and 43GHz. II
We have measured the submilliarcsecond structure of 274 extragalactic sources at 24 and 43 GHz in order to assess their astrometric suitability for use in a high-frequency... -
Celestial Reference Frame at 24 and 43 GHz
We present astrometric results for compact extragalactic objects observed with the Very Long Baseline Array at radio frequencies of 24 and 43GHz. Data were obtained from ten... -
Global 86GHz VLBI survey of compact radio sources
We present results from a large 86GHz global very long baseline interferometry (VLBI) survey of compact radio sources. The main goal of the survey is to increase by factors of... -
VLBI ICRF. II
We use very long baseline interferometry data obtained between mid-1995 and the end of 2002 May together with older data to extend and revise the International Celestial... -
Radio reference frame
A catalogue is presented based on the radio positions of 436 extragalactic sources distributed over the entire sky. The positional accuracy of the sources is better than 3... -
Nutation modeling and VLBI observations
Using geodetic and astrometric VLBI acquired between 1984-1994, we have determined coefficients in the nutation series with uncertainties of 10microarcseconds. This level of... -
Mini-cocoon in 3C84 RadioAstron discovery
We present RadioAstron space-based very long baseline interferometry (VLBI) observations of the nearby radio galaxy 3C84 (NGC1275) at the centre of the Perseus cluster. The... -
Spectral analysis of M87 jet
Because of its proximity and the large size of its black hole, M87 is one of the best targets for studying the launching mechanism of active galactic nucleus jets. Currently,...
