EDP Sciences
Free access
Volume 389, Number 2, July II 2002
Page(s) L47 - L50
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20020663

A&A 389, L47-L50 (2002)
DOI: 10.1051/0004-6361:20020663


An unusual iron Lo-BAL quasar detected by ISOCAM

P.-A. Duc1, 2, P. B. Hall3, D. Fadda4, P. Chanial2, D. Elbaz2, P. Monaco5, E. Pompei6, B. M. Poggianti7, H. Flores8, A. Franceschini9, A. Biviano10, A. Moorwood11 and C. Cesarsky11

1  CNRS URA 2052
2  CEA, DSM, DAPNIA, Service d'Astrophysique, 91191 Gif-sur-Yvette Cedex, France
3  Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Casilla 306, Santiago 22, Chile and Princeton University Observatory, Princeton, NJ 08544-1001, USA
4  Instituto de Astrofisica de Canarias, Via Lactea s/n, 38200 La Laguna - Tenerife, Spain
5  Dipartimento di Astronomia, via G.B. Tiepolo 11, 34131 Trieste, Italy
6  European Southern Observatory, Santiago
7  Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy
8  DAEC/LUL, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France
9  Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio, 5, 35122 Padova, Italy
10  INAF - Osservatorio Astronomico di Trieste, via G.B. Tiepolo, 11, 34131 Trieste, Italy
11  European Southern Observatory, Karl-Schwarzschild-Strasse, 2, 85748 Garching bei München, Germany

(Received 8 March 2002 / Accepted 2 May 2002 )

We report the discovery of an unusual low-ionization broad absorption line quasar at z=1.776 which exhibits absorption lines from many excited states of Fe II. This member of the rare class of "FeLoBAL" quasars was serendipitously found in a mid-infrared (MIR) survey of distant clusters carried out with the ISOCAM camera. ISO J005645.1-273816 has a high MIR to UV luminosity ratio, suggesting a strong dust obscuration plus emission from very hot dust. This characteristic makes MIR surveys particularly efficient at detecting LoBAL quasars.

Key words: quasars: absorption lines -- quasars: individual: ISO J005645.1-273816 -- infrared: galaxies

Offprint request: P.-A. Duc, paduc@cea.fr

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© ESO 2002