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Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract:
We have conducted a GPU accelerated reprocessing of $\sim 87\%$ of the
archival data from the High Time Resolution Universe South Low Latitude (HTRU-S
LowLat) pulsar survey by implementing a pulsar search pipeline that was
previously used to reprocess the Parkes Multibeam pulsar survey (PMPS). We
coherently searched the full 72-min observations of the survey with an
acceleration search range up to $|50|\, \rm m\,s^{-2}$, which is most sensitive
to binary pulsars experiencing nearly constant acceleration during 72 minutes
of their orbital period. Here we report the discovery of 71 pulsars, including
6 millisecond pulsars (MSPs) of which five are in binary systems, and seven
pulsars with very high dispersion measures (DM $>800 \, \rm pc \, cm^{-3}$).
These pulsar discoveries largely arose by folding candidates to a much lower
spectral signal-to-noise ratio than previous surveys, and exploiting the
coherence of folding over the incoherent summing of the Fourier components to
discover new pulsars as well as candidate classification techniques. We show
that these pulsars could be fainter and on average more distant as compared to
both the previously reported 100 HTRU-S LowLat pulsars and background pulsar
population in the survey region. We have assessed the effectiveness of our
search method and the overall pulsar yield of the survey. We show that through
this reprocessing we have achieved the expected survey goals including the
predicted number of pulsars in the survey region and discuss the major causes
as to why these pulsars were missed in previous processings of the survey.
