Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5022g&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #50.22; Bulletin of the American Astronomical Society, Vol. 31, p.900
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the Very Long Baseline Array (VLBA) at a frequency of 2.265 GHz we have resolved the compact extragalactic radio source PKS 1445-161 into four individual components distributed in a region with a diameter < 200 milliarcseconds. The detailed spatial distribution of the four components is unusual for a source of this class. A simple gravitational lens model is presented wherein a background compact radio double is lensed by a foreground singular elliptical isothermal gravitational potential. The background double is lensed into several components whose predicted positions and flux densities are a good match to those of the observed radio components. The center of the model lens is coincident with the most intense of the 2.265 GHz radio components. This suggests that the strongest radio component marks the active nucleus of the foreground lensing galaxy. A 19(th) magnitude quasar is associated with PKS 1445-161. A comparison of the astrometric radio and optical positions of PKS 1445-161 shows that the optical quasar is spatially coincident with the most intense 2.265 GHz radio component. Arcsecond resolution near-infrared (2.2 mu m) images obtained with the 4-m telescope of the Kitt Peak National Observatory (KPNO) show PKS 1445-161 to be point-like, with no associated extended emission. The VLBA is a telescope of the National Radio Astronomy Observatory which is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc. The KPNO is a facility of the National Optical Astronomy Observatories which is operated by the Association of Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation.
Fey Alan Lee
Gaume Ralph A.
Guetter Harry H.
Henden Arne A.
Vrba Fred J.
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