Intensity Mapping Foreground Cleaning with Generalized Needlet Internal Linear Combination

L. C. Olivari, M. Remazeilles, C. Dickinson

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Intensity mapping (IM) is a new observational technique to survey the large-scale structure of matter using spectral emission lines. IM observations are contaminated by instrumental noise and astrophysical foregrounds. The foregrounds are at least three orders of magnitude larger than the searched signals. In this work, we apply the Generalized Needlet Internal Linear Combination (GNILC) method to subtract radio foregrounds and to recover the cosmological HI and CO signals within the IM context. For the HI IM case, we find that GNILC can reconstruct the HI plus noise power spectra with 7.0% accuracy for z = 0.13 - 0.48 (960 - 1260 MHz) and ℓ ≲ 400, while for the CO IM case, we find that it can reconstruct the CO plus noise power spectra with 6.7% accuracy for z = 2.4 - 3.4 (26 - 34 GHz) and ℓ ≲ 3000.

    Original languageEnglish
    Title of host publicationSymposium S333 (Peering towards Cosmic Dawn)
    Pages288-291
    Number of pages4
    DOIs
    Publication statusPublished - Oct 2017

    Keywords

    • cosmology: large-scale structure of universe
    • cosmology: observations
    • methods: data analysis

    Fingerprint

    Dive into the research topics of 'Intensity Mapping Foreground Cleaning with Generalized Needlet Internal Linear Combination'. Together they form a unique fingerprint.

    Cite this