ar X iv : a st ro - p h / 06 11 06 8 v 1 2 N ov 2 00 6 The Origin and Motion of PSR J 0538 + 2817 in S 147

We report on VLBA astrometry and CXO imaging of PSR J0538+2817 in the supernova remnant S147. We measure a parallax distance of 1.47 −0.27 kpc along with a high-precision proper motion, giving a transverse velocity V⊥ = 400 −73 km s . A small extended wind nebula is detected around the pulsar; the symmetry axis of this structure suggests that the spin axis lies 12 ± 4 from the velocity vector (2-D), but the emission is too faint for robust model independent statements. The neutron star is hot, consistent with the young ∼ 40 kyr kinematic age. The pulsar progenitor is likely a runaway from a nearby cluster, with NGC 1960 (M36) a leading candidate. Subject headings: astrometry — pulsars: individual (PSR J0538+2817) — supernovae: individual (S147) — stars: kinematics