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Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract:
We report on the discovery and timing observations of 29 distant long-period
pulsars discovered in the ongoing Arecibo PALFA pulsar survey. Following
discovery with the Arecibo Telescope, confirmation and timing observations of
these pulsars over several years at Jodrell Bank Observatory have yielded
high-precision positions and measurements of rotation and radiation properties.
We have used multi-frequency data to measure the interstellar scattering
properties of some of these pulsars. Most of the pulsars have properties that
mirror those of the previously known pulsar population, although four show some
notable characteristics. PSRs J1907+0631 and J1925+1720 are young and are
associated with supernova remnants or plerionic nebulae: J1907+0631 lies close
to the center of SNR G40.5-0.5, while J1925+1720 is coincident with a
high-energy Fermi gamma-ray source. One pulsar, J1932+1500, is in a
surprisingly eccentric, 199-day binary orbit with a companion having a minimum
mass of 0.33 solar masses. Several of the sources exhibit timing noise, and
two, PSRs J0611+1436 and J1907+0631, have both suffered large glitches, but
with very different post-glitch rotation properties. In particular, the
rotational period of PSR J0611+1436 will not recover to its pre-glitch value
for about 12 years, a far greater recovery timescale than seen following any
other large glitches.
