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We report new results from an HST archival program to study proper motions inthe optical jet of the nearby radio galaxy M87. Using over 13 years of archivalimaging, we reach accuracies below 0.1c in measuring the apparent velocities ofindividual knots in the jet. We confirm previous findings of speeds up to 4.5cin the inner 6" of the jet, and report new speeds for optical components in theouter part of the jet. We find evidence of significant motion transverse to thejet axis on the order of 0.6c in the inner jet features, and superluminalvelocities parallel and transverse to the jet in the outer knot components,with an apparent ordering of velocity vectors possibly consistent with ahelical jet pattern. Previous results suggested a global deceleration over thelength of the jet in the form of decreasing maximum speeds of knot componentsfrom HST-1 outward, but our results suggest that superluminal speeds persistout to knot C, with large differentials in very nearby features all along thejet. We find significant apparent accelerations in directions parallel andtransverse to the jet axis, along with evidence for stationary features inknots D, E, and I. These results are expected to place important constraints ondetailed models of kpc-scale relativistic jets.

Optical Proper Motion Measurements of the M87 Jet: New Results from the Hubble Space Telescope