Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-25
Astrophys.J. 617 (2004) 480-489
Astronomy and Astrophysics
Astrophysics
27 pages, 5 figures
Scientific paper
10.1086/425295
The general properties of the non-thermal non-pulsed X-ray emission of rotation powered pulsars are investigated in the context of a pulsar wind nebula model. An examination of the observed X-ray emission from a sample of 23 pulsars from ASCA in the energy range between 2-10 keV reveals that the relation of X-ray luminosity, $L_x$, to the pulsar spin down power, $\dot{E}$, is steeper for the non-pulsed component than for the pulsed component. Specifically, $L_{x}^{npul} \propto \dot{E}^{1.4 \pm 0.1}$ for the non-pulsed component, whereas $L_{x}^{pul} \propto \dot{E}^{1.2 \pm 0.08}$ for the pulsed component. The former relation is consistent with emission from a pulsar wind nebula model in which $L_{x}^{npul} \propto \dot{E}^{p/2}$ where $p$ is the power law index of the electron energy distribution. The relation for the pulsed component, on the other hand, is consistent with a magnetospheric emission model.
Cheng Kwong Sang
Taam Ronald E.
Wang Wenhong
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