论文标题
通过互相关的FIRA和BOSS数据来限制低红移[CII]排放
Constraining low redshift [CII] Emission by Cross-Correlating FIRAS and BOSS Data
论文作者
论文摘要
我们对档案FIRAS数据和Boss Galaxy Redshift调查执行层析成像互相关分析，以限制[CII] $^2P_ {3/2} \ rightArrow $ $ $ $ $ $^2P_ {1/2} $的幅度。我们的分析采用球形谐波断层扫描（SHT），该谐波基于Firas图和Boss Galaxy在每对红移垃圾箱处的角度频谱之间的角度跨功率，在$ 0.24 <z <z <0.69 $的红移范围内。我们开发了用于强度映射的SHT方法，它比现有功率谱估计器具有多个优势。我们的分析限制了[CII]偏差和[CII]特定强度的乘积，$ b _ {[CII]} i _ {[CII] I} $，为$ <0.31 $ <0.31 $ mjy/sr at $ z {\ z {\ of y of y y} 0.35 $ and $ mjy/sr $ z $ z $ z $ z $ a $} $} $ a $} $} $} $} $} $} $} $} $} $} $} cob;这些限制与[CII]信号的大多数当前模型以及来自普朗克卫星和Boss类星体的高偏移[CII]跨力频谱测量结果一致。我们还表明，如果我们的分析应用于更敏感的仪器（例如拟议的小精灵卫星）的数据，则可以检测出高显着性的悲观[CII]模型。
We perform a tomographic cross-correlation analysis of archival FIRAS data and the BOSS galaxy redshift survey to constrain the amplitude of [CII] $^2P_{3/2}\rightarrow$ $^2P_{1/2}$ fine structure emission. Our analysis employs spherical harmonic tomography (SHT), which is based on the angular cross-power spectrum between FIRAS maps and BOSS galaxy over-densities at each pair of redshift bins, over a redshift range of $0.24<z<0.69$. We develop the SHT approach for intensity mapping, where it has several advantages over existing power spectral estimators. Our analysis constrains the product of the [CII] bias and [CII] specific intensity, $b_{[CII]}I_{[CII]i}$, to be $<0.31$ MJy/sr at $z {\approx} 0.35$ and $<0.28$ MJy/sr at $z {\approx} 0.57$ at $95\%$ confidence. These limits are consistent with most current models of the [CII] signal, as well as with higher-redshift [CII] cross-power spectrum measurements from the Planck satellite and BOSS quasars. We also show that our analysis, if applied to data from a more sensitive instrument such as the proposed PIXIE satellite, can detect pessimistic [CII] models at high significance.
