AO 0235+164 - The case of a gravitationally microlensed BL Lac object

Details AO 0235+164 - The case of a gravitationally microlensed BL Lac object AO 0235+164 - The case of a gravitationally microlensed BL Lac object

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198l..13s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. L13-L16.

Astronomy and Astrophysics

Astrophysics

80

Active Galactic Nuclei, Bl Lacertae Objects, Gravitational Lenses, Astronomical Maps, Red Shift

Scientific paper

Deep direct imaging data reveal that the image of the BL Lac object AO 0235+164 (z = 0.94) has a small eastern extension, in addition to the well-known faint companion 2arcsec to the south (z = 0.524). Two dimensional image decomposition yields a bright galaxy displaced only 0.5arcsec to the BL Lac object. Furthermore AO 0235+164 is surrounded by a number of previously unknown faint galaxies. Spectroscopy of the nearest one, about 6arcsec southwest of the BL Lac object, gives a redshift of 0.525, nearly indentical to the one of the southern companion. Apparently members of a group of galaxies with z = 0.52 are observed which lie along the line of sight to the BL Lac object. The correlated dramatic flux variability in the optical and radio wavebands of AO 0235+164 are most likely the result of gravitational microlensing.

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