Timing Behavior and Proper Motions of Millisecond Pulsars PSR~J2019+2425 and PSR~J2322+2057
Session 37 -- Pulsars
Display presentation, Thursday, January 13, 9:30-6:45, Salons I/II Room (Crystal Gateway)

## [37.05] Timing Behavior and Proper Motions of Millisecond Pulsars PSR~J2019+2425 and PSR~J2322+2057

D. J. Nice (NRAO)

As part of a large-scale millisecond pulsar timing project at the Arecibo Observatory, we have made observations of PSRs~J2019+2425 and J2322+2057 spanning approximately two years. The pulse times of arrival can be fit to a simple model of pulsar rotational behavior, earth motion, and pulsar motion. The effect of proper motion is clearly visible in both data sets; measured values are $\mu=23\pm 2$~mas/yr, Galactic position angle $261\pm4^\circ$ for J2019+2425 and $\mu=25\pm5$~mas/yr, Galactic position angle $245\pm11^\circ$ for J2322+2057. These correspond to velocities of 100~km/s and 90~km/s, respectively, assuming distances based on measures of interstellar dispersion to these pulsars. We discuss the reduction of the pulsar motions to the local standards of rest and the implications of these measurements on the evolution of the millisecond pulsar population.