The milliarcsecond scale structure of low frequency variable sources

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...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1984-01, Vol.135 (2), p.289-299
Main Authors: Romney, J, PADRIELLI, L, Ficarra, A, Mantovani, F, Bartel, N, Weiler, K W, Baath, L B, Kogan, L, MATVEENKO, L, Moiseev, I G
Format: Article
Language:English
Subjects:
interferometry
low frequency variables
radio sources: general
VLBI
Online Access:Get full text
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Summary: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.
ISSN:0004-6361
1432-0746