New determinations of the proper motions of 44 pulsars

Pulsar Recoil and Gravitational Radiation Due to Asymmetrical Stellar Collapse and Explosion

“…Recent data on pulsar proper motions [1], a recalibration of the pulsar distance scale [3], and a general recognition that previous pulsar surveys were biased towards low speeds [4] imply that many pulsars have high proper motions. Mean three-dimensional galactic speeds of 450 90 km s 1 have been estimated [4], with measured transverse speeds of individual pulsars ranging from zero to as much a s 1500 km s 1 .…”

“…Mean three-dimensional galactic speeds of 450 90 km s 1 have been estimated [4], with measured transverse speeds of individual pulsars ranging from zero to as much a s 1500 km s 1 . It has long been known that impulsive mass loss in a spherical supernova explosion that occurs in a binary can impart to the nascent neutron star a substantial proper motion that re ects its progenitor's orbital speed [5,6].…”

“…Recently, Caraveo [13] and Frail, Goss & Whiteoak [14] have identi ed pulsars with young supernova remnants (SNR's) in a majority of SNR's with putative ages less than 20,000 years, but only on the assumption that the pulsars have relatively high transverse velocities with an average value of 500 km s 1 .…”

“…It would be di cult to explain the jagged optical and IR line pro les of SN1987A, the intrinsic polarization of spectral features in SN1993J and SN1987A, and the oblateness of recent HST images of SN1987A without recourse to asymmetries during the explosion itself. In addition, Utrobin et al [17] interpret the \Bochum" event i n H in SN1987A with a 1 0 3 M shard of 56 Ni moving at 4700 km s 1 . Explosion asymmetries and the systemic SNR speeds may be (anti)correlated with the recoil of a nascent neutron star.…”

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AbstractNew data imply that the average velocity of radio pulsars is large [1].Under the assumption that these data imply that a pulsar is born with an \intrinsic" kick, we i n v estigate whether such kicks can be a consequence of asymmetrical stellar collapse and explosion. We calculate the gravitational wave (GW) signature of such asymmetries due to anisotropic neutrino radiation and mass motions.

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