Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..318n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 318-324.
Astronomy and Astrophysics
Astronomy
44
Astronomical Spectroscopy, Galactic Nuclei, Radio Sources (Astronomy), Seyfert Galaxies, Disk Galaxies, Galactic Structure, Plasma Jets, Very Long Base Interferometry
Scientific paper
VLBI observations of the type 2 Seyfert galaxy Mkn 348 show that the nuclear radio source consists of a core and two knots aligned along position angle 168 deg. The total size measures about 50 pc. Flux density monitoring with the WSRT over a four year interval show that the source is highly variable at 6 cm but only moderately variable at 21 cm on time scales of months, and that a new outburst began in early 1982. Structural and spectral data combined indicate the existence of an inverted-spectrum core and an optically thin jet. A low resolution synthesis map shows weak associated radio emission 20 arcsec southwest of the core. These results support the hypothesis that radio sources in both type 1 and type 2 Seyfert galaxies are powered in the same manner as radio galaxies and quasars, by jets of nonthermal material that originate in a compact energetic nucleus.
de Bruyn Ger A.
Neff Susan G.
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