The complex environment of AO 0235+164.

Details The complex environment of AO 0235+164. The complex environment of AO 0235+164.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..754n&link_type=abstract

Astronomy and Astrophysics, v.314, p.754-762

Astronomy and Astrophysics

Astrophysics

29

Bl Lacertae Objects: Individual: Ao 0235+164, Galaxies: Interactions

Scientific paper

We present the results of deep broadband imaging and spectroscopy of the BL Lac object AO 0235+164 taken during 1994 when the object was in an exceptionally faint state. In addition to the well known southern companion, our images show an elongated galaxy ~1.3arcsec to the East of AO 0235+164 in agreement with Yanny et al. (1989ApJ...338..735Y) and qualitatively similar to the galaxy detected by Stickel et al. (1988A&A...198L..13S). Our data do not show signs of the bright cD galaxy proposed to be responsible for the z=0.524 absorption by Abraham et al. (1993ApJ...415..101A). The spectrum of AO 0235+164 shows prominent hydrogen lines Hdelta_ and Hgamma_ at the object redshift of 0.94 in addition to the narrow λ3727 [OII] line and possibly λλ3346,3426 [NeV] at the same redshift. The equivalent width of the Hgamma_ line is 7.2 A in the rest frame of AO 0235+164 exceeding the 5A limit set by Stickel et al. for an object to be included in their 1Jy BL Lac sample. At least when at minimum light AO 0235+164 shows spectral characteristics of a high polarization quasar (HPQ). The z=0.524 Hbeta_ emission line in the southern galaxy has a broad component with a width of 2500km/s, suggesting that it is an intermediate case between Seyfert 1 and 2 galaxies.

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