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The milliarcsecond scale structure of low frequency variable sources
Max-Planck-Institut für Radioastronomie, Bonn, Germany.
CNR, Istituto di Radioastronomia, Bologna, Italy.
Max-Planck-Institut für Radioastronomie, Bonn, Germany & Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA.
Max-Planck-Institut für Radioastronomie, Bonn, Germany & Division of Astronomical Sciences, National Science Foundation, Washington, DC, USA.
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1984 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 135, no 2, p. 289-299Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Les Ulis: EDP Sciences, 1984. Vol. 135, no 2, p. 289-299
Keywords [en]
low frequency variables, interferometry, VLBI, radio sources: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:hh:diva-22790OAI: oai:DiVA.org:hh-22790DiVA, id: diva2:629827
Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2017-12-06Bibliographically approved

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