AO 0235 + 164 and Surrounding Field: Surprising HST Results

Details AO 0235 + 164 and Surrounding Field: Surprising HST Results AO 0235 + 164 and Surrounding Field: Surprising HST Results

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.2533b&link_type=abstract

Astronomical Journal v.112, p.2533

Astronomy and Astrophysics

Astronomy

34

Quasars: Individual: Ao 0235+164, Galaxies: Active, Quasars: Absorption Lines

Scientific paper

Results obtained with the Hubble Space Telescope on the highly variable radio, x-ray, and γ-ray emitting QSO (or BL Lac object) AO 0235+164 are presented and analyzed. WFPC2 images were obtained in 1994 June, when AO 0235+164 was bright (m ~ 17), and the results are described in Sec. 3. After subtraction of the PSF of the QSO, hereafter called AO following the nomenclature of Yanny et al. (1989), the companion object named A, 2" south of AO, is discovered not to be an elliptical galaxy as hypothesized earlier, but to be an AGN object, with a central UV-bright point-source nucleus and faint surrounding nebulosity extending to AO. The second companion object 1.3" east of AO discovered by Yanny et al. (1989) and named object A1, appears more like a normal spiral galaxy. We have measured the positions, luminosities, and colors of some 30 faint objects in the field around AO 0235+164; most are extended and may be star- forming galaxies in a loose group or cluster. Our most surprising result of the HST observations comes from FOS spectra obtained in 1995 July, discussed in Sec. 4. Because of a positioning error of the telescope and AO's faintness at that time (m20), object A was observed instead of the intended target AO. Serendipitously, we discovered A to have broad deep BALQSO-type absorptions of C IV, Si IV, H V shortward of broad emissions. A is thus ejecting high velocity, highly ionized gas into the surrounding IGM. We discuss in Sec. 5 the relationship of the objects in the central 10" x 10" region around AO, where redshifts z_e_ = 0.94, z_a_ = 0.524, 0.851 in AO, z_e_ = 0.524 and z_BAL_ = 0.511 in A, are found. We hypothesize that some of the 30 faint objects in the 77" x 77" field may be part of a large star-forming region at z ~ 0.5, as suggested for a few objects by Yanny et al. (1989). The proximity of two highly active extragalactic objects, AO 0235 + 164 and its AGN companion A, is remarkable and one of the authors (EMB) suggests it may require consideration of a non-cosmological component of redshift in AO 0235+164.

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