Radio continuum morphology of southern Seyfert galaxies

R. Morganti, Zlatan Tsvetanov, J. Gallimore, M. G. Allen

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Abstract

We present radio observations for 29 southern Seyfert galaxies selected from a volume limited sample with cz < 3600 km s-1, and declination δ < 0°. Objects with declination -30° < δ < 0° were observed with the Very Large Array (VLA) at 6 cm (4.9 GHz) and objects with δ < -30° were observed with the Australia Telescope Compact Array (ATCA) at 3.5 cm (8.6 GHz). Both the VLA and the ATCA observations have a resolution of ∼ 1″. These new observations cover more than 50% of the southern sample with all but two of the 29 objects detected above our limit of 0.15 mJy. Combining these data with data available from the literature gives almost 85% coverage of the southern sample and further expands the radio observations of a distance limited sample by 22%. Collecting additional sources from the literature, consisting of known Seyferts with cz < 4600 km s-1, we find that 38% of the sources are unresolved at arcsecond resolution, and 34% have linear radio structure. Our results expand upon and are consistent with earlier studies. We confirm a correlation between the size of the radio structure and the radio luminosity. A comparison between Seyfert types 1 and 2 finds that type 2s tend to have a larger linear size. There is no statistically significant difference in radio power between types 1 and 2, although all the most powerful objects appear to be Seyfert 2's. No significant difference has been found in the spectral indices.

Original languageEnglish
Pages (from-to)457-471
Number of pages15
JournalAstronomy and Astrophysics Supplement Series
Volume137
Issue number3
Publication statusPublished - 2 Jun 1999
Externally publishedYes

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Keywords

  • Galaxies: Seyfert
  • Radio continuum: galaxies

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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