Population statistics of radio and γ-ray pulsars from the Galactic disk
We present results of our population synthesis of normal and millisecond pulsars from the Galactic disk. 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 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-faint 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 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.
Pulsars γ-rays sources pulsar populations nonthermal radiation mechanisms
Peter L. Gonthier Sarah A. Story Brian D. Clow Alice K. Harding
Hope College, Department of Physics, 27 Graves Place, Holland, MI 49423 Rice University, Physics and Astronomy-MS 61, 6100 Main Street, Houston, TX 77005 NASA Goddard Space Flight Center, Code 663, Greenbelt, MD 20771
国际会议
紧凑型物体的天体物理学国际会议(International Conference on Astrophysics of Compact Objects)
安徽黄山
英文
112-114
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）