SPECTROSCOPY OF THE LARGEST EVER γ-RAY-SELECTED BL LAC SAMPLE

@article{Shaw2013SPECTROSCOPYOT,
  title={SPECTROSCOPY OF THE LARGEST EVER $\gamma$-RAY-SELECTED BL LAC SAMPLE},
  author={Michael S. Shaw and Roger W. Romani and Garret Cotter and Stephen E. Healey and P. F. Michelson and Anthony C. S. Readhead and Joseph L. Richards and Walter Max-Moerbeck and Oliver G. King and William J Potter},
  journal={The Astrophysical Journal},
  year={2013},
  volume={764}
}
We report on spectroscopic observations covering most of the 475 BL Lacs in the second Fermi Large Area Telescope (LAT) catalog of active galactic nuclei (AGNs). Including archival measurements (correcting several erroneous literature values) we now have spectroscopic redshifts for 44% of the BL Lacs. We establish firm lower redshift limits via intervening absorption systems and statistical lower limits via searches for host galaxies for an additional 51% of the sample leaving only 5% of the BL… 

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