2013/02/11 by Marco Landoni, Renato Falomo, R. Falomo +9 · 2 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #BL Lac object #Blazar #Galaxy #Gamma-ray bursts and supernovae #Homogeneous #Physics #Radio Astronomy Observations and Technology #Redshift #Sample (material) #Spectral line #Spectroscopy #Telescope #astro-ph.CO
paper · pdf · doi:10.1088/0004-6256/145/4/114
25 pages, 13 Figures. Accepted for publication in the Astronomical Journal
arxiv created 2013/02/11 · openalex publication_date 2013/03/15 · arxiv updated 2015/06/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 ∼ 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.