Radio Continuum and Emission Line Morphologies of Southern Seyfert Galaxies

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dc.creatorTsvetanov, Z.
dc.creatorMorganti, R.
dc.creatorFosbury, R. A. E.
dc.creatorAllen, M. G.
dc.creatorGallimore, J.
dc.date1998-04-09
dc.date.accessioned2026-07-07T02:26:34Z
dc.date.available2026-07-07T02:26:34Z
dc.descriptionWe have collected emission line ([Oiii] 5007 and Halpha+[Nii]) and radio continuum images for a volume limited (cz <= 3600 km/s) sample of southern Seyfert galaxies. The optical data were obtained at ESO using the 2.2 m, NTT and 3.6 m telescopes, and have a typical resolution of 1" and noise level of ~1e-16 ergs cm-2 s-1 arcsec-2. The radio continuum observations were obtained with the VLA (6 cm) and ATCA (3 cm) and have a resolution of ~1" matching that of the optical images. All, but one of the observed sources were detected above the noise limit of ~0.15 mJy. In the radio, 30% of the sources show linear structure, 25% are only slightly resolved or diffused, and 45% remain unresolved at the ~1" resolution. As in previous work, a correlation is found between the size of the radio structure and the radio power. The radio sources in Seyfert 2 galaxies have, on average, larger linear size than their type 1 counterparts, but there is no significant difference in radio power between types 1 and 2. No significant difference is found in the spectral indices of the two Seyfert types. Extended emission is common in Seyfert galaxies -- essentially all objects observed show extended Halpha+[Nii] and nearly 50% show extended [Oiii] emission. At least 40% (18 out of 50) of the galaxies show high excitation extended emission line region (EELR) well outlined in the excitation map. The EELR morphology vary from linear to conical to S-shaped and even X-shaped. Almost exclusively all elongated EELR are in Seyfert 2 galaxies. The orientation of the EELR appears to be random relative to either the major (or minor) axis or relative to the non-axisymmetric structures, such as bars or ovals, when present, and there is a hint of relation to the morphological type.
dc.description2 pages (LaTeX), 2 postscript figures, to appear in the Proceedings of the ESO/ATNF Workshop "Looking Deep in the Southern Sky", Sydney, 10-12 December 1997
dc.identifierhttps://arxiv.org/abs/astro-ph/9804105
dc.identifierhttp://arxiv.org/abs/astro-ph/9804105
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12325
dc.subjectAstrophysics
dc.titleRadio Continuum and Emission Line Morphologies of Southern Seyfert Galaxies
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