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M. Wittkowski, Y. Balega, K.-H.
Hofmann, and G. Weigelt:
Bispectrum speckle interferometry of the
nucleus of NGC 1068
Abstract (poster) for:
Astronomische Gesellschaft Meeting Abstracts (AGM 15, P83)
New Astrophysical
Horizons
Annual Scientific Meeting of the Astronomische Gesellschaft, Sep 21-25,
1999, Göttingen, Germany
Abstract.
We present new K-band bispectrum speckle interferometry studies
of the nuclear region of the Seyfert 2 galaxy NGC 1068.
The speckle interferograms were obtained with the Russian
6m telescope at three different epochs.
The decrease of the visibility function reported earlier
is confirmed by all our new measurements. Furthermore, we find that the
visibility function is asymmetric.
Our results are consistent with a model consisting
of (a) a compact component with an average FWHM size of ~30mas
or 2pc which is elongated along position angle of -20 degree;
(b) an unresolved component and (c) an extended northern
component.
We determine the total flux of both the compact component and the
unresolved component to be 0.5 Jy.
We compare our K-band structures with maps obtained at other
wavelengths
with similar angular resolutions and discuss the nature of the three
components mentioned above.
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