The milliarcsecond scale structure of low frequency variable sources

Details The milliarcsecond scale structure of low frequency variable sources The milliarcsecond scale structure of low frequency variable sources

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..289r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 2, June 1984, p. 289-299.

Astronomy and Astrophysics

Astrophysics

55

Astronomical Maps, Extragalactic Radio Sources, Low Frequencies, Very Long Base Interferometry, High Resolution, Periodic Variations, Radiant Flux Density

Scientific paper

VLBI observations were performed of 21 radio sources which exhibit low frequency variability. The integrated flux densities, variability indices at 0.4 GHz, optical magnitudes, redshifts, spectral indices at 0.4 GHz, and flux intensities with respect to a reference energy flux are provided. The VLBI data were synthesized from observatories located on different continents around the world. All structures were emitted from compact sources with sizes confined to milliarcsc scales. Nearly half displayed core-jet morphologies, while 28 percent had complex structures and 14 percent had either simple structures or were not resolvable. Further observations are proceeding at 400 mHz to confirm the presence of synchrotron electrons and magnetic fields ejected at relativistic speeds along the line of sight, which has the appearance of superluminal velocities.

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