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Paper: Prolonged Intranight Optical Quiescence of the Classical BL Lac Object PKS 0735+178
Volume: 407, The Low-Frequency Radio Universe
Page: 176
Authors: Goyal, A.; Gopal-Krishna; Anupama, G.C.; Sahu, D.K.; Sagar, R.; Britzen, S.; Karazous, M.; Aller, M.F.; Aller, H.D.
Abstract: We report our extensive intranight optical monitoring of the well known low-energy peaked (LBL) BL Lac object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration of ~ 4 hours, on 17 nights spanning the past 11 years (1998−2008). Intra-night optical variability (INOV) amplitude of ≥ 3% on hour-like time scale was not observed in any of the nights even though the likelihood of seeing such INOV levels in a single session of ≥ 4 hours is known to be high (~ 50%) for LBLs. Our observations thus establish a peculiar long-term INOV quiescence of this radio-selected BL Lac.
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