  Chandra observations of the low-energy peaked BL Lac object AP Librae
revealed the clear discovery of a non-thermal X-ray jet. AP Lib is the first
low energy peaked BL Lac object with an extended non-thermal X-ray jet that
shows emission into the VHE range. The X-ray jet has an extension of ~15'' (~
14 kpc). The X-ray jet morphology is similar to the radio jet observed with VLA
at 1.36 GHz emerging in south-east direction and bends by 50 degrees at a
distance of 12'' towards north-east. The intensity profiles of the X-ray
emission are studied consistent with those found in the radio range. The
spectral analysis reveals that the X-ray spectra of the core and jet region are
both inverse Compton dominated. This adds to a still small sample of BL Lac
objects whose X-ray jets are IC dominated and thus more similar to the high
luminosity FRII sources than to the low luminosity FRI objects, which are
usually considered to be the parent population of the BL Lac objects.
