A1 Refereed original research article in a scientific journal
VLT optical spectroscopy of BL Lac objects
Authors: Sbarufatti B, Treves A, Falomo R, Heidt J, Kotilainen J, Scarpa R
Publication year: 2005
Journal name in source: Growing Black Holes: Accretion in a Cosmological Context
Journal acronym: ESO ASTROPHY SYMP
First page : 140
Last page: 141
Number of pages: 2
ISBN: 3-540-25275-4
DOI: https://doi.org/10.1007/11403913_23
Abstract
We report here the first results of a program aimed at obtaining high signal to noise (up to similar 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.
We report here the first results of a program aimed at obtaining high signal to noise (up to similar 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.
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