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BL Lac objects detected at TeV energies preferentially belong to the subclasscalled 'high-frequency-peaked' BL Lacs (HBLs). Parsec-scale radio jets in theseTeV-HBLs often show dominant, slow moving radio knots that are at most mildlysuperluminal. We report the first systematic campaign to characterise theIntra-Night Optical Variability (INOV) of TeV-HBLs using a representativesample of 6 such sources, all showing a fairly high degree of opticalpolarization. Our campaign consists of high-sensitivity monitoring of thissample in 24 sessions of more than 3 hour duration each. For these TeV-HBLs, wefind a striking lack of INOV and based on this, we discuss the importance ofsuperluminal motion of the radio knots vis-a-vis the optical polarization, asthe key diagnostic for INOV detection.

Intranight optical variability of TeV blazars with parsec-scale jets dominated by slow-moving radio knots