Estimating the impact of foregrounds on the future detection of Rayleigh scattering

Zhu, Yijie; Beringue, Benjamin; Choi, Steve K.; Battaglia, Nicholas; Meerburg, P. Daniel; Meyers, Joel

doi:10.1088/1475-7516/2022/09/048

Estimating the impact of foregrounds on the future detection of Rayleigh scattering

Journal Article · Thu Sep 15 00:00:00 EDT 2022 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2022/09/048· OSTI ID:1903361

Zhu, Yijie ^[1]; Beringue, Benjamin ^[2]; Choi, Steve K. ^[3]; Battaglia, Nicholas ^[3]; Meerburg, P. Daniel ^[4]; Meyers, Joel ^[5]

Stony Brook Univ., NY (United States); Cornell Univ., Ithaca, NY (United States); Southern Methodist University
Cardiff Univ., Wales (United Kingdom); DAMTP, Centre for Mathematical Sciences, Cambridge (United Kingdom)
Cornell Univ., Ithaca, NY (United States)
Univ. of Groningen (Netherlands)
Southern Methodist Univ., Dallas, TX (United States)

Rayleigh scattering of the cosmic microwave background (CMB) by neutral hydrogen shortly after recombination leaves frequency-dependent imprints on intensity and polarization fluctuations. High signal-to-noise observations of CMB Rayleigh scattering would provide additional insight into the physics of recombination, including greater constraining power for parameters like the primordial helium fraction, the light relic density, and the sum of neutrino masses. However, such a measurement of CMB Rayleigh scattering is challenging due to the presence of astrophysical foregrounds, which are more intense at the high frequencies, where the effects of Rayleigh scattering are most prominent. Here we forecast the detectability of CMB Rayleigh scattering including foreground removal using blind internal linear combination methods for a set of near-future surveys. Furthermore, we show that atmospheric effects for ground-based observatories and astrophysical foregrounds pose a significant hindrance to detecting CMB Rayleigh scattering with experiments planned for this decade, though a high-significance measurement should be possible with a future CMB satellite.

View Accepted Manuscript (DOE)

Research Organization:: Southern Methodist Univ., Dallas, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0010129

OSTI ID:: 1903361

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 09 Vol. 2022; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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