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351.
Naoki Itoh Youhei Kawana Satoshi Nozawa Yasuharu Kohyama 《Monthly notices of the Royal Astronomical Society》2001,327(2):567-576
We extend the formalism for the calculation of the relativistic corrections to the Sunyaev–Zel'dovich effect for clusters of galaxies and include the multiple scattering effects in the isotropic approximation. We present the results of the calculations by the Fokker–Planck expansion method as well as by the direct numerical integration of the collision term of the Boltzmann equation. The multiple scattering contribution is found to be very small compared with the single scattering contribution. For high-temperature galaxy clusters of the ratio of both the contributions is −0.2 per cent in the Wien region. In the Rayleigh–Jeans region the ratio is −0.03 per cent. Therefore the multiple scattering contribution is safely neglected for the observed galaxy clusters. 相似文献
352.
In this paper, we critically discuss the so-far performed attempts aimed at the detection of the general relativistic gravitomagnetic Lense–Thirring effect in the gravitational field of the Earth with the existing LAGEOS satellites. In the latest reported measurement of the gravitomagnetic shift with the nodes of the LAGEOS satellites and the second generation GRACE-only EIGEN-GRACE02S Earth gravity model over an observational time span of 11 years a 5–10% total accuracy is claimed at 1–3σ, respectively. We will show that, instead, it might be 15–45% (1–3σ) if the impact of the secular variations of the even zonal harmonics is considered. Possible strategies in order both to make more robust and reliable the tests with the node-only LAGEOS–LAGEOS II combination used and to overcome the problems affecting it with other alternative combinations are presented. 相似文献
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根据狭义相对论,讨论相对于静止参照系运动的源电荷在空间产生的电场。并证明该电场是有源有旋场。 相似文献
357.
Internal shocks propagating through an ambient radiation field are subject to a radiative drag that, under certain conditions, can significantly affect their dynamics, and consequently the evolution of the beaming cone of emission produced behind the shocks. The resultant change of the Doppler factor combined with opacity effects leads to a strong dependence on the viewing angle of the variability pattern produced by such systems; specifically, the shape of the light curves and the characteristics of correlated emission. One implication is that objects oriented at relatively large viewing angles to the observer should exhibit a higher level of activity at high synchrotron frequencies (above the self-absorption frequency), and also at gamma-ray energies below the threshold energy of pair production, than at lower (radio/millimetre) frequencies. 相似文献
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李子丰 《测绘与空间地理信息》2007,30(4):11-14
简单介绍了狭义相对论的基本假设和基本时空观,运动物体观测论的基本假设和基本时空观。提出了视时空的概念。导出了运动坐标系真实时空、静止坐标系视时空与静止坐标系真实时空的关系。通过对比分析认为,运动物体观测论解决了运动物体的测量问题,运动不会产生长度变化、时间变化和质量变化,不存在光障。应该放弃狭义相对论。 相似文献
360.