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arXiv 0901.4344astro-ph.COastro-ph.GA
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黄道面WMAP异常信号

WMAP anomalous signal in the ecliptic plane

J. M Diego, M. Cruz, J. Gonzalez-Nuevo, M. Maris, Y. Ascasibar, C. Burigana

摘要:

我们报告的检测高银河纬度,大规模,7西格玛信号在WMAP 5年和空间相关的黄道面。两个可能的候选人进行了研究,即未解决的来源和黄道光发射。我们确定的WMAP频率的黄道光发射的强度,并估计未解决的河外源的贡献。无论是标准的黄道光发射还是未解析的光源似乎都不能单独解释观测到的信号。其他可能的解释,如银河前景和扩散的Sunyaev-Zel'dovich效应似乎也不太可能。我们检查我们的研究结果是否会影响WMAP数据中报告的低l异常。无论是黄道光发射,也没有解决点源残差似乎影响显着的四极和八极测量。然而,具有准黑体光谱和具有类似于黄道光发射的空间分布的信号可以解释异常信号和低辐射异常。未来的数据(普朗克)将需要为了解释这个信号的起源。

英文摘要:

We report the detection of a high Galactic latitude, large scale, 7-sigma signal in WMAP 5yr and spatially correlated with the ecliptic plane. Two possible candidates are studied, namely unresolved sources and Zodiacal light emission. We determine the strength of the Zodiacal light emission at WMAP frequencies and estimate the contribution from unresolved extragalactic sources. Neither the standard Zodiacal light emission nor the unresolved sources alone seem to be able to explain the observed signal. Other possible interpretations like Galactic foregrounds and diffuse Sunyaev-Zel'dovich effect also seem unlikely. We check if our findings could affect the low-l anomalies which have been reported in the WMAP data. Neither Zodiacal light emission nor unresolved point source residuals seem to affect significantly the quadrupole and octupole measurements. However, a signal with a quasi-blackbody spectrum and with a spatial distribution similar to the Zodiacal light emission, could explain both the anomalous signal and the low-ell anomalies. Future data (Planck) will be needed in order to explain the origin of this signal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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