ESO-VLT optical spectroscopy of BL Lac objects: I. new redshifts

Details ESO-VLT optical spectroscopy of BL Lac objects: I. new redshifts ESO-VLT optical spectroscopy of BL Lac objects: I. new redshifts

2004-10-28

arxiv.org/abs/astro-ph/0410692v1

Astronomy and Astrophysics

Astrophysics

19 pages, 6 figures, accepted for publication in AJ

Scientific paper

10.1086/427138

We report redshift measurements for 12 BL Lacertae objects from a program aimed at obtaining high signal to noise (up to ~ 500) optical spectroscopy of a mixed sample of objects. The new observations, gathered with the 8 m ESO Very Large Telescope, allowed us to detect weak spectral features down to a line equivalent width as small as ~ 1 Angstrom. The new redshifts fall in the 0.2-1.3 interval. For nine objects we observe emission lines from the active nucleus. In the remaining three cases absorption lines from the host galaxy are found. For two objects we also detect absorption lines from intervening systems.

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