AAS 207th Meeting, 8-12 January 2006
Session 32 Extreme Physics from Compact Objects
Poster, Monday, 9:20am-7:00pm, January 9, 2006, Exhibit Hall

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[32.03] Radio emission in eight LLAGN: Indications for a turnover in two core spectra

M. Krips (CfA, USA), A. Eckart (University of Cologne, Germany), R. Neri (IRAM, France), J.-U. Pott (ESO, Germany), S. Leon (CSIC, Spain), D. Downes (IRAM, France), S. Garcia-Burillo (OAN, Spain), F. Combes, F. Boone (LERMA, France), A.J. Baker (NRAO, USA), L.J. Tacconi (MPE, Germany), E. Schinnerer (MPIA, Germany), L.K. Hunt (Arcetri, Italy), P. Englmaier (Astron. Institute of Basel, Swiss)

We present high angular resolution radio observations of seven nearby low luminosity active galaxies from the NUGA survey carried out with MERLIN and VLBI at 18cm and 6cm and the IRAM PdBI at 3mm and 1mm. Additionally, we discuss the case of NGC1068 based on mm data recently obtained by us with the IRAM PdBI and cm data from the literature. We find extended emission in form of jets or diffuse components in about 40-50 One source, NGC1068, shows a jet and a counter-jet even at mm-wavelengths. The fluxes appear to decrease with increasing angular resolution at cm wavelengths for these sources further supporting extended emission. All sources show flat to inverted core spectra over the observed wavelength range except in the case of two galaxies, NGC3147 and NGC1068, which reveal a turnover at mm wavelengths. The turnover in NGC3147 can be explained with synchrotron self absorption while the one in NGC1068 is most likely caused by electron scattered synchrotron emission though thermal free-free emission cannot be totally excluded. The VLBI radio luminosities at 6cm correlate with the X-ray luminosities as well as the black hole masses. Such a tight correlation is predicted by the ADAF theory, which also reproduces the overall SED of the observed galaxies.

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