Is the BL Lacertae object AO 0235 + 164 being lensed by its intervening MG II absorber?

Details Is the BL Lacertae object AO 0235 + 164 being lensed by its intervening MG II absorber? Is the BL Lacertae object AO 0235 + 164 being lensed by its intervening MG II absorber?

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..101a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 101-112.

Astronomy and Astrophysics

Astrophysics

30

Absorption Spectra, Bl Lacertae Objects, Emission Spectra, Gravitational Lenses, Metallicity, Active Galactic Nuclei, Magnesium, Two Dimensional Models

Scientific paper

We report the results of deep CFHT imaging of the BL Lac object AO 0235 + 164. This object exhibits Mg II absorption features and has been considered to be the best candidate for a microlensed BL Lac on the basis of its multiple redshift systems, decentered host, and extreme apparent superluminal motion. We test the microlensing hypothesis by modeling our images with a two-dimensional image fitting routine. The resulting best-fit models allow us to put strong constraints on lensing scenarios for this object, and to put limits on the mass-to-light ratio of the foreground Mg II absorbing galaxy. We conclude that, while AO 0235 + 164 is almost certainly being weakly amplified by macrolensing, microlensing by stars in the foreground lens is unnecessary in order to explain the observed properties of AO 0235 + 164. These results are combined with the work of previous authors to suggest that the (probably lensing) Mg II absorbing galaxy in the foreground of AO 0235 + 164 is embedded in a cooling flow.

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