ESO-VLT optical spectroscopy of BL Lac objects: II. New redshifts, featureless objects and classification assessments

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dc.creatorSbarufatti, B.
dc.creatorTreves, A.
dc.creatorFalomo, R.
dc.creatorHeidt, J.
dc.creatorKotilainen, J.
dc.creatorScarpa, R.
dc.date2006-01-23
dc.date.accessioned2026-07-07T11:25:12Z
dc.date.available2026-07-07T11:25:12Z
dc.descriptionWe report on ESO Very Large Telescope optical spectroscopy of 42 BL Lacertae objects of unknown redshift. Nuclear emission lines were observed in 12 objects, while for another six we detected absorption features due to their host galaxy. The new high S/N spectra therefore allow us to measure the redshift of 18 sources. Five of the observed objects were reclassified either as stars or quasars, and one is of uncertain nature. For the remaining 18 the optical spectra appear without intrinsic features in spite of our ability to measure rather faint (EW nearly 0.1 Angstrom) spectral lines. For the latter sources a lower limit to the redshift was set exploiting the very fact that the absorption lines of the host galaxy are undetected on the observed spectra.
dc.description33 pages, 11 figures, accepted for publication on AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0601506
dc.identifierhttp://arxiv.org/abs/astro-ph/0601506
dc.identifierAstron.J.132:1-19,2006
dc.identifierdoi:10.1086/503031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195438
dc.subjectAstrophysics
dc.titleESO-VLT optical spectroscopy of BL Lac objects: II. New redshifts, featureless objects and classification assessments
dc.typetext

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