THE EVOLUTION OF THE γ- AND X-RAY LUMINOSITIES OF PULSAR WIND NEBULAE
THE EVOLUTION OF THE γ- AND X-RAY LUMINOSITIES OF PULSAR WIND NEBULAE
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DOI：
10.1088/0004-637x/694/1/12
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发表时间：
2008-11
期刊：
影响因子：
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通讯作者：
F. Mattana;M. Falanga;D. Gotz;R. Terrier;P. Esposito;A. Pellizzoni;A. Luca;V. Marandon;A. Goldwu
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文献类型：
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作者：
F. Mattana;M. Falanga;D. Gotz;R. Terrier;P. Esposito;A. Pellizzoni;A. Luca;V. Marandon;A. Goldwu
脉冲星风星云（PWNe）是银河系中一类重要的超高能（E > 0.1TeV）源。它们的γ射线谱被解释为超相对论电子对周围光子的逆康普顿散射，而X射线谱则是同步辐射。我们研究了γ射线和X射线的发射与恒星的下旋光度和特征年龄之间的关系。我们发现，星云的γ射线与X射线通量比与距离无关，它与下旋光度成反比（），而与母星的特征年龄（τ τ2.2c）成正比。我们解释这些结果是由于电子能量分布和星云动力学的演变，支持所谓的遗物PWNe的想法。这些经验关系为分类未识别的弥散γ射线源和根据相关PWNe的X射线和γ射线性质估计未探测到脉动的旋转动力天体的自旋下降光度和特征年龄提供了一种新的工具。我们应用这些关系来预测与风星云相关的四个候选星（到目前为止无脉冲）的自旋光度和特征年龄。
Pulsar wind nebulae (PWNe) are a prominent class of very high energy (E > 0.1 TeV) Galactic sources. Their γ-ray spectra are interpreted as due to inverse Compton scattering of ultrarelativistic electrons on the ambient photons, whereas the X-ray spectra are due to synchrotron emission. We investigate the relation between the γ- and X-ray emission and the pulsars' spin-down luminosity and characteristic age. We find that the distance-independent γ-ray to X-ray flux ratio of the nebulae is inversely proportional to the spin-down luminosity, (), while it appears proportional to the characteristic age, (∝τ2.2c), of the parent pulsar. We interpret these results as due to the evolution of the electron energy distribution and the nebular dynamics, supporting the idea of so-called relic PWNe. These empirical relations provide a new tool to classify unidentified diffuse γ-ray sources and to estimate the spin-down luminosity and characteristic age of rotation-powered pulsars with no detected pulsation from the X-ray and γ-ray properties of the associated PWNe. We apply these relations to predict the spin-down luminosity and characteristic age of four (so far unpulsing) candidate pulsars associated with wind nebulae.