Optical Spectroscopy of BL Lac Objects:new redshifts and mis-identified sources

Details Optical Spectroscopy of BL Lac Objects:new redshifts and mis-identified sources Optical Spectroscopy of BL Lac Objects:new redshifts and mis-identified sources

2003-06-30

arxiv.org/abs/astro-ph/0306617v1

Astron.Astrophys.412:651-656,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A; 6 pages

Scientific paper

10.1051/0004-6361:20031519

We are carrying out a multi-purpose program of high signal to noise optical spectroscopy at medium resolution of 30 BL Lac objects. Here we report the detection of three new redshifts, and the discovery of three misclassified sources. The new redshifts refer to PKS0754+100 (z=0.266), H-1914-194 (z=0.137) and 1ES0715-259, for which we derive a redshift of z=0.465 and also a ``new'' classification a Steep Spectrum Radio Quasar. In two cases (UM493 and 1620+103) stellar spectra indicate a wrong classification. The three sources with new redshift measurement show strong [OIII] emission in their spectra and their host galaxy properties are known. The central black hole masses derived using the M_{BH}-L_{bulge} and the M_{BH}-\sigma([OIII]) relations are compared.

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