A1 Refereed original research article in a scientific journal
Spectroscopy of BL Lac Objects: New redshifts and mis-identified sources.
Authors: Carangelo N, Falomo R, Kotilainen J, Treves A, Ulrich MH
Publication year: 2003
Journal name in source: HIGH ENERGY BLAZAR ASTRONOMY
Journal acronym: ASTR SOC P
Volume: 299
First page : 299
Last page: 302
Number of pages: 4
ISBN: 1-58381-146-X
Abstract
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.
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.
UTU Research Portal