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Astron. Astrophys. 343, L40-L44 (1999)


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Letter to the Editor

Ly[FORMULA] emission at [FORMULA] around the quasar J2233-606 in the Hubble Deep Field South *

J. Bergeron 1, P. Petitjean 2,3, S. Cristiani 1,4, S. Arnouts 4, F. Bresolin 1 and G. Fasano 5

1 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany
2 Institut d'Astrophysique de Paris, CNRS, 98 bis Boulevard Arago, F-75014 Paris, France
3 UA CNRS 173- DAEC, Observatoire de Paris-Meudon, F-92195 Meudon Cedex, France
4 Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
5 Osservatorio Astronomico, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy

Received 4 December 1998 / Accepted 8 January 1999

Abstract

The STIS Hubble Deep Field South around the quasar J2233-606 was observed in the course of the VLT-UT1 Science Verification programme with the Test Camera in two broad-band filters, B and R, and in a narrow-band filter roughly centered at the quasar emission redshift, [FORMULA]. The most striking result is the discovery of a giant Ly[FORMULA] nebulosity around this radio-weak quasar, with an overall extent of [FORMULA] or [FORMULA] h[FORMULA] kpc2 and a luminosity of 3.1 [FORMULA] h[FORMULA] erg s-1 (for q0 = 0), similar to those found around radio-loud quasars and radio galaxies. There are three additional emission-line candidates in a [FORMULA] field with an observed Ly[FORMULA] flux above our 3[FORMULA] Ly[FORMULA] detection limit of [FORMULA] erg s-1 cm-2 for point sources. The resolved bright object located [FORMULA] north-east of the quasar, which has recently been identified as a galaxy at [FORMULA] = 0.57, has an associated, weak Mg II absorption in the quasar spectrum.

Key words: cosmology: observations – galaxies: quasars: general – galaxies: halos – galaxies: clusters: general

* Based on observations collected at the European Southern Observatory, Paranal, Chile.

Send offprint requests to: J. Bergeron

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999

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