Measurement of CIB power spectra over large sky areas from Planck HFI maps
Measurement of CIB power spectra over large sky areas from Planck HFI maps
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DOI：
10.1093/mnras/stw3112
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发表时间：
2017-04-01
影响因子：
4.8
通讯作者：
Lagache, Guilaine
中科院分区：
文献类型：
--
作者：
Mak, Daisy Suet Ying;Challinor, Anthony;Lagache, Guilaine
我们使用普朗克2015年全任务高频仪器数据在20000度以上的353，545和857 GHz处对宇宙红外背景（CIB）各向异性的功率谱进行了新的测量。我们使用类似于普朗克宇宙学分析的技术，在功率谱水平上减去尘埃排放。我们的分析给出了稳定的解决方案CIB功率谱增加天空覆盖率高达约50%的天空。这些光谱与普朗克在小得多的天空区域测量的低银河尘埃排放的H I清洁光谱吻合得很好。在545和857 GHz，我们的CIB光谱同意以及从赫歇尔数据测量。我们发现，CIB光谱在l大于或类似于500很好地拟合的幂律模型的集群CIB，与浅指数γ（CIB）= 0.53 +/- 0.02。这与普朗克宇宙学参数分析的217 GHz CIB结果一致。我们表明，545和857 GHz普朗克地图的线性组合是由CIB波动在多极l大于或接近300。
We present new measurements of the power spectra of the cosmic infrared background (CIB) anisotropies using the Planck 2015 full-mission High frequency instrument data at 353, 545 and 857 GHz over 20 000 deg(2). We use techniques similar to those applied for the cosmological analysis of Planck, subtracting dust emission at the power spectrum level. Our analysis gives stable solutions for the CIB power spectra with increasing sky coverage up to about 50 per cent of the sky. These spectra agree well with H I-cleaned spectra from Planck measured on much smaller areas of sky with low Galactic dust emission. At 545 and 857 GHz, our CIB spectra agree well with those measured from Herschel data. We find that the CIB spectra at l greater than or similar to 500 are well fitted by a power-law model for the clustered CIB, with a shallow index gamma(cib) = 0.53 +/- 0.02. This is consistent with the CIB results at 217 GHz from the cosmological parameter analysis of Planck. We show that a linear combination of the 545 and 857 GHz Planck maps is dominated by the CIB fluctuations at multipoles l greater than or similar to 300.