Abstract
We report on Keck spectra of ten Fermi blazars. J0622+3326, previously
unobserved, is shown to be a flat-spectrum radio quasar at redshift z=1.062.
The others are known BL Lac-type objects that have resisted previous attempts
to secure redshifts. Using a photometric monitoring campaign with the 0.76 m
Katzman Automatic Imaging Telescope at Lick Observatory, we identified epochs
when the relativistic jet emission was fainter than usual, thus triggering the
Keck spectroscopy. This strategy gives improved sensitivity to stars and
ionized gas in the host galaxy, thereby providing improved redshift constraints
for seven of these sources.
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