Probing radio emission in Seyfert Galaxies on parsecand kiloparsec-scales

P. Kharb1*, V. Singh2, J. F. Gallimore3 and C. H. Ishwara-Chandra4
1Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
2Institut d’Astrophysique Spatiale, Batiment 121, University Paris Sud XI, 91405 Orsay Cedex, France
3Bucknell University, Lewisburg, PA 17837, USA
4National Centre for Radio Astrophysics - TIFR, Ganeshkhind P.O., Pune 411007, India

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Seyfert galaxies have traditionally been classified as radio-quiet active galactic nuclei. A proper consideration of the nuclear optical emission however proves that a majority of Seyferts are radio-loud. Kpc-scale radio lobes/bubbles are in fact revealed in sensitive observations at low radio frequencies of several Seyferts. Through the use of very long baseline interferometry, we have been able to determine the direction of the parsecscale jets in some of these Seyfert galaxies. The misalignment between the parsec-scale jets and the kpc-scale lobes that is typically observed, is either suggestive of no connection between the two, or the presence of curved jets that power the radio lobes. In this context, we briefly discuss our new low radio frequency GMRT observations of two Seyfert galaxies with lobes.

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Keywords : galaxies: Seyfert – radio continuum – techniques: interferometric