Population Statistics Study Of Radio And Gamma-ray Pulsars From The Galactic Disk

Details Population Statistics Study Of Radio And Gamma-ray Pulsars From The Galactic Disk Population Statistics Study Of Radio And Gamma-ray Pulsars From The Galactic Disk

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1201g&link_type=abstract

American Astronomical Society, HEAD meeting #10, #12.01

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present results of our pulsar population synthesis of normal and millisecond pulsars from the Galactic disk using our previously developed computer code. Over the past several years, a program has been developed to simulate pulsar birth, evolution and emission using Monte Carlo techniques. We have added to the program the capability to simulate millisecond pulsars, which are old, recycled pulsars with extremely short periods. We model the spatial distribution of millisecond pulsars by assuming that they start with a random kick velocity and then evolve through the Galactic potential. We use a polar cap/slot gap model for gamma-ray emission from both millisecond and normal pulsars. We also include gamma-ray emission from an outer-gap model to compare the statistics of radio-loud and radio-quiet gamma-ray pulsars on the same footing as pulsars from our polar cap/slot gap model. From our studies of radio pulsars that have clearly identifiable core and cone components, in which we fit the polarization sweep as well as the pulse profiles in order to constrain the viewing geometry, we develop a model describing the ratio of radio core-to-cone peak fluxes. In this model, short period pulsars are more cone-dominated than in our previous studies. We present the preliminary results of our recent study including comparisons between these two groups of pulsars and the implications for observing these pulsars with GLAST and AGILE. GLAST should detect significant numbers of millisecond pulsars.
We express our gratitude for the generous support of the Michigan Space Grant Consortium, of the National Science Foundation (REU and AST-0307365) and the NASA Astrophysics Theory Program.

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