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arXiv 0707.2601astro-ph
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寒武纪星系CMB前景:动力学Sunyaev Zeldovich效应的总贡献和偏振贡献

Camouflaged galactic CMB foregrounds: total and polarized contributions of the kinetic Sunyaev Zeldovich effect

A. Waelkens, M. Maturi, T. Ensslin

摘要:

我们认为银河系动力学Sunyaev Zeldovich(SZ)效应作为CMB前景的作用。虽然银河系的热Sunyaev Zeldovich效应先前已被研究和丢弃作为一个潜在的CMB前景,我们发现,动力学SZ效应是占主导地位的银河系的情况下。我们分析的可检测性的动力学SZ效应的最佳匹配滤波器技术应用于一个理想的观察模拟的装置。我们没有得到检测,得到的S/N比为0.1,从而表明,动力学SZ效应也可以安全地被忽略作为CMB的前景。然而,我们提供了预期信号的地图,以供将来的高精度数据处理。此外,我们排除了显着的污染的偏振CMB信号的第二次散射的星系动力学Sunyaev Zeldovich光子,因为我们表明,散射的CMB四极光子的星系电子是一个更强的效果比Sunyaev Zeldovich第二次散射,并已被证明不会产生显着的偏振污染。我们确认后者的评估也通过一个最佳匹配滤波器。

英文摘要:

We consider the role of the galactic kinetic Sunyaev Zeldovich (SZ) effect as a CMB foreground. While the galactic thermal Sunyaev Zeldovich effect has previously been studied and discarded as a potential CMB foreground, we find that the kinetic SZ effect is dominant in the galactic case. We analyse the detectability of the kinetic SZ effect by means of an optimally matched filter technique applied to a simulation of an ideal observation. We obtain no detection, getting a S/N ratio of 0.1, thereby demonstrating that the kinetic SZ effect can also safely be ignored as a CMB foreground. However we provide maps of the expected signal for inclusion in future high precision data processing. Furthermore, we rule out the significant contamination of the polarised CMB signal by second scattering of galactic kinetic Sunyaev-Zeldovich photons, since we show that the scattering of the CMB quadrupole photons by galactic electrons is a stronger effect than the Sunyaev Zeldovich second scattering, and has already been shown to produce no significant polarised contamination. We confirm the latter assessment also by means of an optimally matched filter.

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