ESO VLT optical spectroscopy of BL Lacertae objects. III. An extension of the sample

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dc.creatorSbarufatti, B.
dc.creatorCiprini, S.
dc.creatorKotilainen, J.
dc.creatorDecarli, R.
dc.creatorTreves, A.
dc.creatorVeronesi, A.
dc.creatorFalomo, R.
dc.date2008-10-20
dc.date.accessioned2026-07-07T10:11:44Z
dc.date.available2026-07-07T10:11:44Z
dc.descriptionWe present results of an ongoing program at the ESO VLT for spectroscopy of BL Lac objects lacking a firm redshift estimate and here we report on 15 objects. For 11 sources we confirm the BL Lac classification, and we determine new redshifts for 3 objects, 1 with weak emission lines (PKS 1057-79, z=0.569) and 2 with absorptions from the host galaxy (RBS 1752, z=0.449; RBS 1915, z=0.243); moreover a sub Damped Lyman Alpha (sub-DLA) system is detected in the direction of the BL Lac PKS 0823-223 (z>=0.911). For the remaining 8 BL Lacs, from the very absence of absorption lines of the host galaxy, lower limits to the redshift are deduced with z_min in the interval 0.20-0.80. The remaining three sources are reclassified as a FSRQ (PKS 1145-676, z=0.210; TXS 2346+052, z=0.419) and a misclassified galactic star (PMNJ 1323-3652).
dc.description16 pages, 5 figures, 3 tables, accepted for publication on AJ
dc.identifierhttps://arxiv.org/abs/0810.3563
dc.identifierhttp://arxiv.org/abs/0810.3563
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/171954
dc.subjectAstrophysics
dc.titleESO VLT optical spectroscopy of BL Lacertae objects. III. An extension of the sample
dc.typetext

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