The Location of the Active Nucleus in the Radio Galaxy 3C 294

Details The Location of the Active Nucleus in the Radio Galaxy 3C 294 The Location of the Active Nucleus in the Radio Galaxy 3C 294

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8315s&link_type=abstract

HST Proposal ID #8315

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #8315 Agn Hosts And Environment

Scientific paper

We have obtained AO K'-band imaging of the z=1.779 radio galaxy 3C 294 showing detailed and intriguing structure within a region a little larger than an arcsecond across. Our bandpass corresponds to restframe 6800-8300 Angstrom, a region devoid of strong emission lines, so it is likely that the structure is dominated by continuum radiation. It is not obvious which {if any} of the numerous knots corresponds to the nucleus, and the correct interpretation of the structure depends critically on its location. The center of 3C 294 lies about 9" from a V=12 star, and we know the registration of our image with respect to this star to an accuracy of 10 mas. Furthermore, the position of the compact flat-spectrum radio core is known from VLA observations to a similar or better precision. However, the position of the bright star is uncertain by at least 0.8" {2 Sigma}. We need to improve this uncertainty by at least a factor of 6 in order to locate the nucleus with sufficient precision in our image. We propose to use FGS1R to measure the position of the star and three nearby V 15 stars with respect to a bright Hipparcos star, which can be placed simultaneously in the FGS1R pickle. We will use groundbased observations to determine more accurately the HST rotation angle so that we can obtain both coordinates to the required accuracy from the single astrometric standard.

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