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Title: PHOTOMETRICALLY TRIGGERED KECK SPECTROSCOPY OF FERMI BL LACERTAE OBJECTS

We report on Keck spectra of 10 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.
Authors:
;  [1] ; ; ;  [2]
  1. Department of Physics/KIPAC, Stanford University, Stanford, CA 94305 (United States)
  2. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)
Publication Date:
OSTI Identifier:
22273292
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 146; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; BL LACERTAE OBJECTS; EMISSION SPECTRA; GALAXIES; GAMMA RADIATION; JETS; LIMITING VALUES; MONITORING; PHOTOMETRY; QUASARS; RED SHIFT; RELATIVISTIC RANGE; STARS; TELESCOPES