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ESO VLT Optical Spectroscopy of BL Lac Objects IV. New spectra and properties of the full sample

We present the last chapter of a spectroscopy program aimed at deriving the redshift or a lower limit to the redshift of BL Lac objects using medium resolution spectroscopy. Here we report new spectra for 33 BL Lac object candidates obtained in 2008-2009 confirming the BL Lac nature of 25 sources and for 5 objects we obtained new redshifts. These new observations are combined with our previous data in order to construct a homogeneous sample of \sim 70 BL Lacs with high quality spectroscopy. All these spectra can be accessed at the website http://www.oapd.inaf.it/zbllac/. The average spectrum, beaming properties of the full sample, discussion on intervening systems and future perspectives are addressed.

preprint2013arXivOpen access
Marco LandoniRenato FalomoAldo TrevesBoris SbarufattiMartina BarattiniRoberto DecarliJari Kotilainen
astro-ph.CO
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Marco LandoniRenato FalomoAldo TrevesBoris SbarufattiMartina BarattiniRoberto DecarliJari Kotilainen

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