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P.L. Gonthier, S.A. Story, B.M. Giacherio, R.A. Arevalo (Hope College), A.K. Harding (NASA Goddard Space Flight Center)
We seek to constrain the magnetic inclination and impact angles of a sample of radio pulsars that have clearly identifiable core and cone components in their profiles. We constrain the maximum rate of change of the position angle (PA) by fitting the rotating vector model to the position angle swing. Assuming core and cone beam geometries and the maximum rate of change of the PA, we constrain the inclination angle by fitting the intensities of the profiles allowing for the determination of both the inclination and impact angles. We incorporate a single conal geometry with a frequency dependence from the work of Kijak and Gil (2003), which then permits strict constraints on the viewing geometry. The fits allow us to obtain separate spectral indices of the angle-integrated flux (over the emission surface) as well as luminosities. Assuming pulsar distances, we explore trends of the core and cone beams with period and period derivative. We present the results of the ratio of the core-to-cone peak fluxes as well as core and cone luminosities and implications for radio and gamma-ray profile correlation studies.
We express our gratitude for the generous support of the Michigan Space Grant Consortium, of Research Corporation (CC5813), of the National Science Foundation (REU and AST-0307365) and the NASA Astrophysics Theory Program.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.