Sub-arcsec radio structure of the core-dominated Seyfert galaxy Markarian 348 (NGC 262)

Details Sub-arcsec radio structure of the core-dominated Seyfert galaxy Markarian 348 (NGC 262) Sub-arcsec radio structure of the core-dominated Seyfert galaxy Markarian 348 (NGC 262)

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209p..15u&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, July 15, 1984, p. 15P-19P.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Galactic Nuclei, Galactic Structure, Radio Astronomy, Seyfert Galaxies, Radio Emission, Very Long Base Interferometry

Scientific paper

Several 18-cm and 6-cm MERLIN observations of sub-arcsec structure in the center of Mkn 348 are presented. The radio structure at high frequencies is dominated by an unresolved, highly variable, inverted-spectrum core. Although it is extremely unusual to find such a core in Seyfert galaxies, more normal steep-spectrum emission is also present extending about 50 pc to the north and south. Equipartition calculations indicate that the pressure of the relativistic plasma in the lobes is substantially higher than the thermal pressure in the forbidden-line region of this galaxy, and so the lobes must currently be in a phase of expansion.

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