Intensity Mapping in the Presence of Foregrounds and Correlated Continuum Emission

Abstract

Intensity mapping has attracted significant interest as an approach to measure the properties of the interstellar medium in typical galaxies at high redshift. Intensity mapping measures the statistics of surface brightness as a function of frequency, making it sensitive not only to all line emission of interest but also radiation from all other sources. Significant effort has gone into developing approaches that reject foreground contamination. Additionally, the target galaxies have multiple sources of emission that can complicate the interpretation of the line brightness. We describe the problem of jointly estimating correlated continuum emission and cleaning uncorrelated continuum emission, such as from the Milky Way. We apply these considerations to a cross-correlation of Planck data with BOSS quasars for a determination of CII for 2 < z < 3.2. Intensity mapping surveys with few bands have unique challenges for treating foregrounds and avoiding bias from correlated continuum emission. We show how a future intensity mapping survey with many bands can separate line from continuum emission in cross-correlation.

19 pages, 16 figures, Submitted ApJ

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Cited by in corpus (16)

• Line-Intensity Mapping: Theory Review
• SKAO HI Intensity Mapping: Blind Foreground Subtraction Challenge
• An Intensity Mapping Constraint on the CO-Galaxy Cross Power Spectrum at Redshift ~ 3
• A multi-tracer empirically-driven approach to line-intensity mapping lightcones
• Extragalactic Science with the Experiment for Cryogenic Large-aperture Intensity Mapping
• Constraining low redshift [CII] Emission by Cross-Correlating FIRAS and BOSS Data
• Intensity Mapping without Cosmic Variance
• CONCERTO: Extracting the power spectrum of the [C II ] emission line
• Signatures of reionization feedback in the near-infrared background
• Leveraging cross-correlations and linear covariance-based filtering for line-intensity map reconstructions at linear scales
• HI Intensity Mapping with the MIGHTEE Survey: First Results of the HI Power Spectrum
• Constraining the Star Formation Rate using Joint CIB Continuum and [CII] Intensity Mapping
• Removal of interloper contamination to line-intensity maps using correlations with ancillary tracers of the large-scale structure
• Constraining the [CII] luminosity function from the power spectrum of line-intensity maps at redshift 3.6
• Probing the warm dark matter mass with [C II] intensity mapping
• Comparison of Cross-Correlation Methods for Line Intensity Mapping