Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396...62c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 62-79.
Astronomy and Astrophysics
Astronomy
41
Active Galactic Nuclei, Active Galaxies, Galactic Structure, Radio Galaxies, Very Long Base Interferometry, Radio Sources (Astronomy), Radio Spectra
Scientific paper
Intercontinental VLBI arrays were used to map the compact radio sources 0710 + 439 and 2352 + 495 at frequencies of 5.0 and 10.7 GHz. The source 0710 + 439 was also mapped at 1.7 GHz. Multiepoch observations show that apparent velocities between the components in both sources are below c. In the source 0710 + 439 comparison of multiepoch data makes it possible to set a limit of 0.054 +/- 0.14/h c on the rate of separation of the two brightest components. In 2352 + 495 the multiepoch 5 GHz VLBI data show that the flux density variations detected by total flux density monitoring are due to changes within the middle component. The morphology, spectra, and variability of the middle components suggest that the center of activity in both sources lies here rather than in either of the outer components, providing clear evidence of symmetric radio structure in a powerful AGN.
Conway John E.
Mutel Robert L.
Pearson Timothy. J.
Readhead Anthony C. S.
Unwin Stephen C.
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