Achromatic variability in the BL Lac object PKS 2155-304. A case for microlensing?

A. Treves, F. Rovetti, Ph. Jetzer +1

PKS 2155-304 is the only BL Lac object for which well-sampled multiwavelength light curves resolve the intraday variability at UV and X-ray wavelengths. In particular we focus on t…