VLT optical spectroscopy of BL Lac objects



: Sbarufatti B, Treves A, Falomo R, Heidt J, Kotilainen J, Scarpa R

: 2005

Growing Black Holes: Accretion in a Cosmological Context

: ESO ASTROPHY SYMP

: 140

: 141

: 2

: 3-540-25275-4

DOI: https://doi.org/10.1007/11403913_23


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.



Last updated on 2025-14-10 at 09:53