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Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract:
We report the discovery and timing results for five millisecond pulsars
(MSPs) from the Arecibo PALFA survey: PSRs J1906+0055, J1914+0659, J1933+1726,
J1938+2516, and J1957+2516. Timing observations of the 5 pulsars were conducted
with the Arecibo and Lovell telescopes for time spans ranging from 1.5 to 3.3
yr. All of the MSPs except one (PSR J1914+0659) are in binary systems with low
eccentricities. PSR J1957+2516 is likely a redback pulsar, with a ~0.1
$M_\odot$ companion and possible eclipses that last ~10% of the orbit. The
position of PSR J1957+2516 is also coincident with a NIR source. All 5 MSPs are
distant (>3.1 kpc) as determined from their dispersion measures, and none of
them show evidence of $\gamma$-ray pulsations in a search of Fermi Gamma-Ray
Space Telescope data. These 5 MSPs bring the total number of MSPs discovered by
the PALFA survey to 26 and further demonstrate the power of this survey in
finding distant, highly dispersed MSPs deep in the Galactic plane.
