Eso very large telescope optical spectroscopy of bl lacertae objects. iv. new spectra and properties of the full sample

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

Research output: Contribution to journalArticle

19 Scopus citations

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 ∼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.

Original languageEnglish (US)
Article number114
JournalAstronomical Journal
Volume145
Issue number4
DOIs
StatePublished - Apr 1 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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