A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
VLT optical spectroscopy of BL Lac objects
Tekijät: Sbarufatti B, Treves A, Falomo R, Heidt J, Kotilainen J, Scarpa R
Julkaisuvuosi: 2005
Tietokannassa oleva lehden nimi: Growing Black Holes: Accretion in a Cosmological Context
Lehden akronyymi: ESO ASTROPHY SYMP
Aloitussivu: 140
Lopetussivu: 141
Sivujen määrä: 2
ISBN: 3-540-25275-4
DOI: https://doi.org/10.1007/11403913_23
Tiivistelmä
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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