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Astron. Astrophys. 323, 98-104 (1997)

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The generation order parameters and the [FORMULA] -ray spectra of pulsars *

D.M. Wei 1, 3, L.M. Song 1, 4 and T. Lu 2, 1

1 Department of Astronomy, Nanjing University, Nanjing 210093, P.R. China
2 CCAST(World Laboratory) P.O.Box 8730, Beijing 100080, P.R. China
3 Purple Mountain Observatory, Nanjing 210008, P.R. China
4 High Energy Physics Institute, Academia Sinica, Beijing 100039, P.R. China

Received 23 April 1996 / Accepted 18 November 1996

Abstract

Based on the Ruderman-Sutherland (or shortly R-S) model, the mechanisms of [FORMULA] -ray emission from pulsars are discussed. We mainly consider the influences of magnetic fields on photon absorption. The concept of generation order parameters for pulsars is refined. The generation order parameters are proven to be monotonically and smoothly related to the spectral index and the mean photon energy. The agreement between the calculated results and the observational data is good. The radiation conversion efficiency is also introduced. Based on these concepts, observational quantities such as luminosities, fluxes, mean photon energies and others are calculated and listed in tables. Finally, we discuss the influence of both electric and magnetic fields on the photon absorption.

Key words: magnetic fields – stars: neutron – pulsars: general – gamma rays: theory

* supported by the National Natural Science Foundation, the National Climbing Programme on Fundamental Researches and the Foundation of the Committee for Education of China

Send offprint requests to: T. Lu, Dept. of Astronomy, Nanjing University, Nanjing, 210093, China (tlu@nju.edu.cn)

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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