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arxiv: astro-ph/0210016 · v1 · submitted 2002-10-01 · 🌌 astro-ph

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

N. Carangelo (1 , 4) , R. Falomo (2) , J. Kotilainen (3) , A. Treves (4) , M.-H. Ulrich (5) ((1) Universita' di Milano-Bicocca , (2) Osservatorio Astronomico di Padova , (3) Tuorla Observatory
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(4) Universita' dell'Insubria (5) European Southern Observatory)
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classification 🌌 astro-ph
keywords redshiftssourcesspectraspectroscopycarryingcasesclassificationes0715-259
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We are carrying out a program of high signal to noise optical spectroscopy of BL Lacs with unknown or tentative redshift. Here we report some preliminary results. New redshifts are measured for PKS0754+100 (z=0.266) and 1ES0715-259 (z=0.464) . From lineless spectra of PG1553+113 and PKS1722+119 we set a lower limit of z>0.3 for both sources. In two cases (UM493 and 1620+103) stellar spectra indicate a wrong classification.

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