SIMBAD references

2004ApJ...608..418C - Astrophys. J., 608, 418-426 (2004/June-2)

Gamma-ray emission properties from mature pulsars in the Galaxy and in the Gould belt.

CHENG K.S., ZHANG L., LEUNG P. and JIANG Z.J.

Abstract (from CDS):

We study the γ-ray emission properties of pulsars by using a new self-consistent outer gap model. The outer gap can exist in pulsars older than 1 million yr if the effect of magnetic inclination angle, as well as the average properties of the outer gap, are considered. The mature γ-ray pulsars, whose ages are between 0.3 and 3 million yr, are able to move up to high Galactic latitude. Moreover, their γ-ray luminosities are weaker, and their spectra are significantly softer than those of younger γ-ray pulsars in the Galactic plane. We use a Monte Carlo method to simulate the statistical properties of γ-ray pulsars in the Galaxy as well as in the Gould Belt. We find that γ-ray pulsars located at {mid}b{mid}<5° and {mid}b{mid}>5° have very different properties. High Galactic latitude γ-ray pulsars are dominated by mature pulsars with longer periods, weaker fluxes, and softer spectra. If the pulsar birth rates in the Galaxy and the Gould Belt are ∼10–2 and ∼2x10–5/yr, respectively, there are 42 and 35 radio-quiet γ-ray pulsars for {mid}b{mid}<5° and {mid}b{mid}>5°, respectively. The number of radio-quiet γ-ray pulsars from the Gould Belt are 2 and 13 for {mid}b{mid}<5° and {mid}b{mid}>5°, respectively. We suggest that a good fraction of unidentified EGRET γ-ray sources may be these radio-quiet γ-ray pulsars. Furthermore, γ-ray pulsars located at {mid}b{mid}>5° satisfy Lγ∝Lβsd, whereas Lγ∝Lδsdfor γ-ray pulsars in the Galactic plane, where β∼0.6 and δ∼0.3, respectively.

Abstract Copyright:

Journal keyword(s): Gamma Rays: Theory - Stars: Pulsars: General - Stars: Neutron - Stars: Statistics

Simbad objects: 15

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