Astrophys. J., 547, 39-49 (2001/January-3)
Where are the absorbers toward Q2302+029?
BOWEN D.V., JIMENEZ R., JENKINS E.B. and PETTINI M.
Abstract (from CDS):
We present images and spectroscopy of objects close to the sight line of Q2302+029 in order to search for galaxies responsible for the remarkable z=0.7 high-ionization absorption-line system found by Jannuzi et al. This system shows ``normal'' narrow O VI, N V, and C IV lines superimposed on broader (3000-5000 km.s–1 wide), unsaturated absorption troughs some 56,000 km.s–1 away from the QSO emission redshift (zem=1.052). Despite reaching sensitivities sufficient to detect 1/10L* galaxies in the optical and 1/20L* in the infrared, we are unable to detect any obvious bright galaxies that might be responsible for the absorption beyond ~6 h–1 kpc of the sight line. This supports the hypotheses that the absorption is either intrinsic to the QSO or arises in intracluster gas. Adopting either explanation is problematic: in the first case, ``associated'' absorption at such high ejection velocities is difficult to understand, and challenges the conventional discrimination between intrinsic and extrinsic absorbers; in the second case, the gas must reside in a ∼40 h–1 Mpc long filament aligned along the line of sight in order to reproduce the broad absorption. Since the absorption system is unusual, such a chance alignment might not be unreasonable. Spectroscopy of objects beyond the immediate vicinity of the QSO sight line reveals a galaxy cluster at z=0.59, which coincides with strong Lyα and more narrow high-ionization lines in the quasar spectrum. Here, too, the lack of galaxies at distances comparable to those found for, e.g., Lyα-absorbing galaxies, suggests that the absorption may arise from intracluster gas unassociated with any individual galaxies.
Cosmology: Large-Scale Structure of Universe - Galaxies: Quasars: Absorption Lines - quasars: individual (Q2302+029)
Tables 1, 3: [BJJ2001] NNNN N=41+24 among (Nos 65-1000).
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