Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..813s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 15, 1984, p. 813-843.
Astronomy and Astrophysics
Astronomy
46
Extragalactic Radio Sources, Quasars, Radiant Flux Density, Red Shift, Angular Distribution, Astronomical Maps, Centimeter Waves, Interstellar Magnetic Fields
Scientific paper
High-resolution observations of 28 quasars selected from the 3C and 4C complete samples and three from the B2 sample are reported. The observations were performed with a VLA with a resolution of about 0.4 arcsec at 4.87 GHz. It is found that about a quarter of the quasars located near the upper envelope to the largest angular size (LAS) diagram show only relaxed lobes in which no prominent hotspots are seen, implying that their radio lobes are currently not being supplied with energy. About 60 percent of the quasars contain at least one compact hotspot less than 4 kpc in size in the direction of minor axis. For nearly two thirds of the hotspots, the magnetic field directions are found to be nearly perpendicular to the lines joining the hotspots to the quasar nuclei, supporting the hypothesis that a prominent hotspot is formed as a result of the compression of a magnetic field at the point where the energy beam impinges on the intergalactic medium. No marked dependence was found between hotspot size and the redshift diagram, and a deficiency of large quarsars was found relative to the prediction of a Friedmann universe.
Hilldrup K.
Sinha Rameshwar P.
Swarup Gadde
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