Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243...93b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 1, March 1991, p. 93-102.
Astronomy and Astrophysics
Astronomy
15
Active Galactic Nuclei, Gravitational Lenses, Interacting Galaxies, Quasars, Infrared Astronomy Satellite, Radio Sources (Astronomy), Stellar Spectra
Scientific paper
Optical observations of a new case of a close angular association between a quasar and a galaxy system are presented. A tidal arm of the disturbed galaxy system is found to be situated in front of the quasar which is 15 arcsec away from the brighter nucleus. Whether the foreground galaxy system is capable of causing significant gravitational microlens or macrolens effects on observable properties of GC0248 + 430 is discussed. To search for microlensing variability, optical photometric monitoring of the quasar has been performed since October 1988. Variations were detected with two different time scales corresponding to those in the radio, thus both time scales can be interpreted in terms of microlensing.
Borgeest Ulf
Dietrich Matthew
Hopp Ulrich
Kollatschny Wolfram
Schramm K.-J.
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