Constraining low redshift [CII] Emission by Cross-Correlating FIRAS and BOSS Data

Abstract

We perform a tomographic cross-correlation analysis of archival FIRAS data and the BOSS galaxy redshift survey to constrain the amplitude of [CII] ${}^2{P}_{3/2}\to$ ${}^2{P}_{1/2}$ 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.

20 pages, 14 figures, accepted by MNRAS

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Cited by in corpus (8)

• Line-Intensity Mapping: Theory Review
• CMB spectral distortions revisited: a new take on $\mu$ distortions and primordial non-Gaussianities from FIRAS data
• Forecasts and Statistical Insights for Line Intensity Mapping Cross-Correlations: A Case Study with 21cm x [CII]
• Evidence of extended [CII] and dust emission in local dwarf galaxies
• Characteristic Functions for Cosmological Cross-Correlations
• The BINGO project VIII: On the recoverability of the BAO signal on HI intensity mapping simulations
• A statistical framework for recovering intensity mapping autocorrelations from crosscorrelations
• Leveraging cross-correlations and linear covariance-based filtering for line-intensity map reconstructions at linear scales