%0 Generic %1 shaw2013photometrically %A Shaw, Michael S. %A Filippenko, Alexei V. %A Romani, Roger W. %A Cenko, S. Bradley %A Li, Weidong %D 2013 %K blazars spectra %T Photometrically Triggered Keck Spectroscopy of Fermi BL Lac Objects %U http://arxiv.org/abs/1308.2756 %X 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.

@misc{shaw2013photometrically, 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.}, added-at = {2013-08-14T07:12:26.000+0200}, author = {Shaw, Michael S. and Filippenko, Alexei V. and Romani, Roger W. and Cenko, S. Bradley and Li, Weidong}, biburl = {https://www.bibsonomy.org/bibtex/2a53eb2e527fdc5ee5e4397d26094e5b2/miki}, description = {[1308.2756] Photometrically Triggered Keck Spectroscopy of Fermi BL Lac Objects}, interhash = {6788f108dc72cd84d4198e7b25057a15}, intrahash = {a53eb2e527fdc5ee5e4397d26094e5b2}, keywords = {blazars spectra}, note = {cite arxiv:1308.2756Comment: 7 pages; Accepted to AJ}, timestamp = {2013-08-14T07:12:26.000+0200}, title = {Photometrically Triggered Keck Spectroscopy of Fermi BL Lac Objects}, url = {http://arxiv.org/abs/1308.2756}, year = 2013 }