A1 Refereed original research article in a scientific journal

ESO VERY LARGE TELESCOPE OPTICAL SPECTROSCOPY OF BL LACERTAE OBJECTS. IV. NEW SPECTRA AND PROPERTIES OF THE FULL SAMPLE



Authors: Landoni M, Falomo R, Treves A, Sbarufatti B, Barattini M, Decarli R, Kotilainen J

Publisher: IOP PUBLISHING LTD

Publication year: 2013

Journal: The Astronomical Journal

Journal name in source: ASTRONOMICAL JOURNAL

Journal acronym: ASTRON J

Article number: ARTN 114

Number in series: 4

Volume: 145

Issue: 4

Number of pages: 12

ISSN: 0004-6256

DOI: https://doi.org/10.1088/0004-6256/145/4/114


Abstract
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 obtaining new redshifts for 5 objects. These new observations are combined with our previous data in order to construct a homogeneous sample of similar to 70 BL Lac objects with high-quality spectroscopy. All these spectra can be accessed at the Web site http://www.oapd.inaf.it/zbllac/. The average spectrum, beaming properties of the full sample, discussion of intervening systems, and future perspectives are addressed.



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