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Title:
NUclei of GAlaxies. V. Radio emission in 7 NUGA sources
Authors:
Krips, M.; Eckart, A.; Krichbaum, T. P.; Pott, J.-U.; Leon, S.; Neri, R.; García-Burillo, S.; Combes, F.; Boone, F.; Baker, A. J.; Tacconi, L. J.; Schinnerer, E.; Hunt, L. K.
Affiliation:
AA(Universität zu Köln, I. Physikalisches Institut, Zülpicher Str. 77, 50937 Köln, Germany ; Harvard-Smithsonian Center for Astrophysics, SMA project, 645 North A'Ohoku Place, Hilo, HI 96720, USA ), AB(Universität zu Köln, I. Physikalisches Institut, Zülpicher Str. 77, 50937 Köln, Germany ), AC(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany ), AD(Universität zu Köln, I. Physikalisches Institut, Zülpicher Str. 77, 50937 Köln, Germany; ESO, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany ), AE(Instituto de Astrofísica de Andalucía (CSIC), C/ Camino Bajo de Huétor 24, Apartado 3004, 18080 Granada, Spain ; IRAM, Avenida Divina Pastora 7, Núcleo Central, 18012 Granada, Spain ), AF(Institut de Radio-Astronomie Millimétrique (IRAM), 300 rue de la Piscine, 38406 Saint-Martin-d'Hères, France ), AG(Observatorio Astronómico Nacional (OAN)-Observatorio de Madrid, Alfonso XII, 3, 28014 Madrid, Spain ), AH(Observatoire de Paris, LERMA, 61 Av. de l'Observatoire, 75014 Paris, France ), AI(Observatoire de Paris, LERMA, 61 Av. de l'Observatoire, 75014 Paris, France ), AJ(Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA ), AK(Max-Planck-Institut für Extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany ), AL(Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany ), AM(INAF-Istituto di Radioastronomia/Sezione Firenze, Largo E. Fermi 5, 50125 Firenze, Italy )
Publication:
Astronomy and Astrophysics, Volume 464, Issue 2, March III 2007, pp.553-563 (A&A Homepage)
Publication Date:
03/2007
Origin:
EDP Sciences
Keywords:
galaxies: active, galaxies: Seyfert, galaxies: nuclei, galaxies: jets, radio, continuum: galaxies
DOI:
10.1051/0004-6361:20065037
Bibliographic Code:
2007A&A...464..553K

Abstract

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.

EVN: The European VLBI Network is a joint facility of European, Chinese, South African and other radio astronomy institutes funded by their national research councils. MERLIN is a national facility operated by the University of Manchester on behalf of PPARC. VLBI including the VLBA: The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.


Associated Articles

Part 1     Part  2     Part  4     Part  3     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10    


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