Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
M. Wittkowski, Y. Balega, T. Beckert,
W.J. Duschl, K.-H. Hofmann
and G. Weigelt:
Diffraction-limited IR speckle masking
observations of the central regions of Seyfert galaxies
Proceedings of The Central Regions of the
Galaxy and Galaxies,
IAU Symp. No. 184, Yoshiaki Sofue (ed.), Kluwer, Dordrecht, p. 103-104
(1998)
Abstract.
We present speckle masking observations of Seyfert galaxies with
the Russian 6m telescope. Diffraction-limited resolution of 76 mas in
the K-band was obtained for the first time. The results show that NGC
1068
is resolved with a FWHM diameter of 30 mas or 2 pc for an assumed
Gaussian flux distribution. The image is elongated in northern
direction,
which is approximately the direction of the radio jet.
Assuming that the observed flux is mainly nuclear light
(from, for example, scattering lobes above and below a torus, without
absorption and re-emission) we use the same synchrotron model as has
been
used for the Galactic Center to explain our data. With this model, we
find a
source radius of R=10^15 cm, a magnetic field of
B=11 G, a electron number density of n_e = 1.1 10^3 cm^-3
and a mean electron energy of 2.7 GeV.
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