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Astron. Astrophys. 346, L21-L24 (1999)


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Letter to the Editor

Identification of absorbing galaxies towards the QSO J2233-606 in the Hubble Deep Field South *

Laurence Tresse 1,2,8, Michel Dennefeld 1,3, Patrick Petitjean 1,4, Stefano Cristiani 5,6 and Simon White 7

1 Institut d'Astrophysique de Paris - CNRS, 98bis Boulevard Arago, F-75014 Paris, France
2 Istituto di Radioastronomia del CNR, Via Gobetti, 101, I-40129 Bologna, Italy
3 Université Pierre et Marie Curie, Paris, France
4 DAEC - Observatoire de Paris, 5 Place Jules Janssen, F-92295 Meudon, France
5 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
6 Dipartimento di Astronomia, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
7 Max-Planck-Institut für Astrophysik, D-85740 Garching, Germany
8 Laboratoire d'Astonomie Spatiale, B.P. 8, F-13376 Marseille Cedex 12, France

Received 8 December 1998 / Accepted 10 May 1999

Abstract

We present spectroscopic observations of galaxies lying within 1´ of QSO J2233-606 in the Hubble Deep Field South (HDF-S). Several are found to be coincident in redshift with absorption-line systems seen in the HST J2233-606 spectrum. We detect a new [FORMULA] QSO with [FORMULA] at a projected angular separation of 44.5" (or [FORMULA] kpc; [FORMULA]) from J2233-606. This QSO pair is an ideal target for QSO environment studies. Indeed, strong H I Ly[FORMULA] and Ly[FORMULA] absorptions are seen at [FORMULA] in the J2233-606 spectrum. The bright spiral galaxy (J2233378-603324), projected at 4.7" from J2233-606, is at [FORMULA] (thus [FORMULA] kpc). Absorption is seen in the Lyman series at the same redshift but the weakness of the Lyman break implies N(H I) [FORMULA] cm-2.

Key words: galaxies: halos – galaxies: ISM – galaxies: quasars: absorption lines – galaxies: quasars: individual: J2233 – 606

* Based on observations obtained with the NTT at the European Southern Observatory, La Silla, Chile under programs 61.A-0631 and 62.O-0363; and with the NASA/ESA Hubble Space Telescope by the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.

Send offprint requests to: L. Tresse

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999

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