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Mignani","submitted_at":"2018-08-21T15:28:48Z","abstract_excerpt":"We analyzed two Chandra observations of PSR J2055+2539 (for a total integration time of $\\sim$130 ks) in order to measure its proper motion and study its two elongated nebular features. We did not detect the proper motion, setting an upper limit of 240 mas yr$^{-1}$ (3$\\sigma$ level), that translates into an upper limit on the transverse velocity of $\\sim$700 km s$^{-1}$, for an assumed distance of 600 pc. A deep H$\\alpha$ observation did not reveal the bow-shock associated with a classical pulsar wind nebula, thus precluding an indirect measurement of the proper motion direction. 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