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Blind searches for radio-quiet gamma-ray pulsars with Fermi-LAT

Posted on:2012-10-14Degree:Ph.DType:Dissertation
University:University of California, Santa CruzCandidate:Dormody, Michael HarryFull Text:PDF
GTID:1458390011950684Subject:Physics
Abstract/Summary:
Blind searches for radio-quiet pulsars have been extremely fruitful, with over two dozen detected in searches of LAT point sources. While there is a general idea that the blind search sensitivity to radio-quiet gamma-ray pulsars is worse compared with the sensitivity to radio-loud pulsars, it has not been well established quantitatively. To achieve this, we simulate pulsars across a wide variety of rotational and spectral parameters, and search for pulsations in their corresponding LAT optimized positions. Using these results, we can estimate the detection threshold given a location on the sky and a spectral model. We also explore the benefit of using counterpart source locations from multiwavelength observations (e.g. X-rays).;The sensitivity to blind searches can be used to estimate the gamma-ray pulsar birth distribution, an open question in pulsar astronomy. We use a model for galactic gamma-ray pulsars and evolve them to the present-day via the gravitational potential of the Galaxy. By comparing the resulting distribution with the known pulsar distribution, we can effectively rule out certain birth models at high confidence and place an estimate on the number of galactic gamma-ray pulsars.
Keywords/Search Tags:Pulsars, Searches, Blind, Radio-quiet
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