Bibcode
Sbarufatti, B.; Treves, A.; Falomo, R.; Heidt, J.; Kotilainen, J.; Scarpa, R.
Referencia bibliográfica
In: Growing black holes: accretion in a cosmological context. Proceedings of the MPA/ESO/MPE/USM Joint Astronomy Conference held at Garching, Germany, 21-25 June 2004. A. Merloni, S. Nayakshin, R. A. Sunyaev (Eds.). ESO astrophysics symposia. Berlin: Springer, ISBN 3-540-25275-4, ISBN 978-3-540-25275-7, 2005, p. 140 - 141
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2005
Número de citas
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Número de citas referidas
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Descripción
We report here the first results of a program aimed at obtaining high
signal to noise (up to ~ 500) optical spectroscopy of a large sample of
BL Lac objects using ESO VLT+FORS1. New spectroscopic observations have
been obtained for 31 objects, which allows us to obtain new redshift for
13 targets and provide better classification for others. In a number of
cases no lines are detected and lower limits to the redshift can be
estimated.