102 datasets found

Keywords: very long baseline interferometry

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  • Closure Plots for "Source Structure and Measurement Noise Are as Important as...

    Plots of closure delay, closure phase, and closure amplitude are provided for the geodetic very long baseline interferometry (VLBI) observations of the Continuous VLBI Campaign...
  • Fermi unassociated sources ATCA observations

    We report results of the first phase of observations with Australia Telescope Compact Array (ATCA) at 5 and 9GHz of the fields around 411 {gamma}-ray sources with declinations...
  • Precise Radio Source Positions from Mark III VLBI

    This catalog contains observations from 600 Mark III VLBI experiments from conducted between 1979 to 1988. These experiments resulted in 237681 acceptable pairs of group delay...
  • VLBI International Celestial Reference Frame (ICRF)

    The International Celestial Reference Frame (ICRF), is intended for adoption be the International Astronomical Union (IAU) as the conventional celestial system, under the name...
  • International Celestial Reference Frame 2, ICRF2

    This Technical Note describes the generation by an international team of the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths using...
  • Radio-optical reference frame link

    Between 1997 and 2004 several observing runs were conducted mainly with the CTIO 0.9m to image ICRF counterparts (mostly QSOs) in order to determine accurate optical positions....
  • 6 and 20cm flux densities of radio galaxies

    We discuss the "angular size-redshift" relation for compact radio sources distributed over a wide range of redshifts 0.011<=z<=4.72. Our study is based on a sample of 330...
  • 86GHz VLBI survey of compact radio sources

    File table1 contains the list of observed sources, providing the source coordinates (J2000) and redshift, detection status, type, optical magnitude, and brightness temperature...
  • Stability of VLBI reference frame

    The file table 2 gives the results of various tests and noise measurements performed on time serie of extragalactic radio source coordinates. Systematic and random behaviours in...
  • BVRI photometry of OQ 530

    Results of VLBI and optical observations are presented for the BL Lac object OQ 530 (B1418+546), whose long-term optical variability is characterised by a decreasing mean...
  • VLBI and VLA obs. of Seyfert galaxies

    We have obtained mas-scale resolution very long baseline interferometry (VLBI) images of a sample of Seyfert 1 and Seyfert 2 galaxies at 5GHz (wavelength, {lambda}=6cm). The...
  • Radio source selection for the ICRF

    The most accurate realization of a quasi inertial reference frame, the International Celestial Reference Frame (ICRF), is made of 212 defining extragalactic radio sources whose...
  • Radio source distribution

    Information on physical characteristics of astrometric radio sources, such as magnitude and redshift, is of great importance for many astronomical studies. However, data usually...
  • VLBI detection of 398 extragalactic radio sources

    The European space astrometry mission Gaia will construct a dense optical QSO-based celestial reference frame. For consistency between optical and radio positions, it will be...
  • Radio-optical scrutiny of compact AGN

    We study the correlations between the VLBA (Very Long Baseline Array) radio emission at 15GHz, extended emission at 151MHz, and optical nuclear emission at 5100{AA} for a...
  • VLBI imaging of 105 extragalactic radio sources

    The European space astrometry mission Gaia, to be launched by 2012, will construct a dense optical QSO-based celestial reference frame which will need to be linked to the...
  • Bright AGN VLBI imaging study at 2 and 8GHz

    We investigate statistical and individual astrophysical properties of active galactic nuclei (AGNs), such as parsec-scale flux density, core dominance, angular and linear sizes,...
  • Catching the radio flare in CTA 102

    Very Long Baseline Interferometry (VLBI) observations can resolve the radio structure of active galactic nuclei (AGN) and provide estimates of the structural and kinematic...
  • Lockman Hole/XMM VLBI observations

    Active galactic nuclei (AGN) play a decisive role in galaxy evolution, particularly so when they launch powerful jets, which reshape their surroundings. However, identifying...
  • Time stability of the ICRF2 axes

    I assess the astrometric stability of the 295 defining sources of the current best realization of the International Celestial Reference System (ICRS): the second realization of...
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