NUclei of GAlaxies V. Radio emission in 7 NUGA sources

TY - JOUR

T1 - NUclei of GAlaxies V. Radio emission in 7 NUGA sources

AU - Krips, M.

AU - Eckart, A.

AU - Krichbaum, T. P.

AU - Pott, J. U.

AU - Leon, S.

AU - Neri, R.

AU - García-Burillo, S.

AU - Combes, F.

AU - Boone, F.

AU - Baker, A. J.

AU - Tacconi, L. J.

AU - Schinnerer, E.

AU - Hunt, L. K.

PY - 2007/3

Y1 - 2007/3

N2 - We present high angular resolution radio snap-shot observations of seven nearby low-luminosity active galaxies (LLAGN) from the NUclei of GAlaxies (NUGA) survey. The observations were conducted with MERLIN and EVN/VLBI at 18 cm and 6 cm. At all observed angular resolutions and frequencies, we find indications for extended emission in about ∼40% of the sources, consistent with the decrease of flux with increasing angular resolution. The extended components resemble jet emission in a majority of cases, consistent with the optically thin synchrotron emission implied by their steep spectra. We consider the compact 6 cm EVN/VLBI radio emission of our sources in the context of the "fundamental plane" that previous LLAGN studies identified within the three-dimensional parameter space of radio luminosity, X-ray luminosity, and black hole mass. We demonstrate, using NGC 7217 and NGC 1068 as particular examples, that high-resolution, multi-epoch radio observations offer useful information about the origin of offsets from the fundamental plane.

AB - We present high angular resolution radio snap-shot observations of seven nearby low-luminosity active galaxies (LLAGN) from the NUclei of GAlaxies (NUGA) survey. The observations were conducted with MERLIN and EVN/VLBI at 18 cm and 6 cm. At all observed angular resolutions and frequencies, we find indications for extended emission in about ∼40% of the sources, consistent with the decrease of flux with increasing angular resolution. The extended components resemble jet emission in a majority of cases, consistent with the optically thin synchrotron emission implied by their steep spectra. We consider the compact 6 cm EVN/VLBI radio emission of our sources in the context of the "fundamental plane" that previous LLAGN studies identified within the three-dimensional parameter space of radio luminosity, X-ray luminosity, and black hole mass. We demonstrate, using NGC 7217 and NGC 1068 as particular examples, that high-resolution, multi-epoch radio observations offer useful information about the origin of offsets from the fundamental plane.

KW - Galaxies: Seyfert

KW - Galaxies: active

KW - Galaxies: jets

KW - Galaxies: nuclei

KW - Radio continuum: galaxies

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U2 - 10.1051/0004-6361:20065037

DO - 10.1051/0004-6361:20065037

M3 - Article

SN - 0004-6361

VL - 464

SP - 553

EP - 563

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -