The milliarcsecond structure of the quasar 3C 279

Details The milliarcsecond structure of the quasar 3C 279 The milliarcsecond structure of the quasar 3C 279

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279...83c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 1, p. 83-89

Astronomy and Astrophysics

Astronomy

34

Doppler Effect, Flux Density, Lorentz Contraction, Precession, Quasars, Radio Astronomy, Radio Jets (Astronomy), Centimeter Waves, Superhigh Frequencies, Very Long Base Interferometry, X Ray Astronomy

Scientific paper

High resolution very long base interferometry (VLBI) maps of the quasar 3C 279 are presented for five epochs between 1987.42 and 1990.17 at frequencies 10.7 and 22.2 GHz. A new structural feature at 10.7 GHz, correlated with multifrequency outbursts, is identified near the nucleus at epoch 1989.3. At least two components are moving with apparent superluminal speed betaobs approximately euqals 2.8/h relative to the nucleus. The VLBI structure can be explained by a relativistic beaming model; we deduce a jet angle to the line of sight of 37 deg less than or equal to phi less than or equal to 39 deg and a Lorentz factor gamma greater than or equal to 3. The estimated apparent opening angle is 33 deg +/- 5 deg. Using X-ray measurements, we determine a lower limit to the Doppler factor delta greater than or equal to 1.1, indicating moderate relativistic bulk motion. We explain the continuous variation in betaobs and P.A. from one component to another as resulting from precession of the jet with a period of approximately 30 years.

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