MNRAS-2016-Munshi-mnras-stw2067.pdf (393.83 kB)
Extracting the late-time kinetic Sunyaev-Zel'dovich effect
journal contribution
posted on 2023-06-09, 02:40 authored by Dipak MunshiDipak Munshi, Ilian IlievIlian Iliev, Keri DixonKeri Dixon, P ColesWe propose a novel technique to separate the late-time, post-reionization component of the kinetic Sunyaev Zeldovich (kSZ) effect from the contribution to it from a (poorly understood and probably patchy) reionization history. The kSZ effect is one of the most promising probe of the missing baryons in the Universe. We study the possibility of reconstructing it in three dimensions (3D), using future spectroscopic surveys such as the Euclid survey. By reconstructing a 3D template from galaxy density and peculiar velocity fields from spectroscopic surveys we cross-correlate the estimator against CMB maps. The resulting cross-correlation can help us to map out the kSZ contribution to CMB in 3D as a function of redshift thereby extending previous results which use tomographic reconstruction. This allows the separation of the late-time effect from the contribution owing to reionization. By construction, it avoids contamination from foregrounds, primary CMB, tSZ effect as well as from star-forming galaxies. Due to a high number density of galaxies the signal-to-noise ratio (S/N) for such cross-correlational studies is higher, compared to the studies involving CMB power-spectrum analysis. Using a spherical Bessel–Fourier (sFB) transform we introduce a pair of 3D power spectra: C?l(k) and C?l(k) that can be used for this purpose. We find that in a future spectroscopic survey with near all-sky coverage and a survey depth of z ˜ 1, reconstruction of C?l(k) can be achieved in a few radial wave bands k ˜ (0.01–0.5 h-1 Mpc) with a S/N ratio of up to O(10) for angular harmonics in the range = (200–2000).
History
Publication status
- Published
File Version
- Accepted version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
3Volume
463Page range
2425-2442Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-08-30First Open Access (FOA) Date
2016-08-30First Compliant Deposit (FCD) Date
2016-08-30Usage metrics
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