The Location of the Nucleus of NGC 1068 from HST Imaging Polarimetry and Absolute Astrometry

Details The Location of the Nucleus of NGC 1068 from HST Imaging Polarimetry and Absolute Astrometry The Location of the Nucleus of NGC 1068 from HST Imaging Polarimetry and Absolute Astrometry

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.248..245c&link_type=abstract

Astrophysics and Space Science, Volume 248, Issue 1-2, pp. 245-251

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

We present the results of a program to obtain an accurate (better than 100 mas) astrometry of HST images of NGC 1068 and consequently a direct registration with radio images. The optical peak seen in the HST images is located at α = 02h42m40.711s, δ = -00°00′47.81 (J2000, FK5), with an error of 80 mas. The hidden nucleus, as determined by HST imaging polarimetry, falls at α = 02h42m40.710s, δ = -00°00′48.11. It is offset toward the South, i.e. along the radio axis, with respect to the inverted spectrum radio component, S1, by 170 mas (12 pc). This does not rule out that S1 is indeed associated with the obscuring torus and the central engine, but suggests that the nucleus of NGC 1068 might be radio silent or its emission absorbed also at radio wavelengths.

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