Polarization of the Cosmic Infrared Background Fluctuations

Feng, Chang; Holder, Gilbert

doi:10.48550/arxiv.1907.12085

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Codis et al 2018;Piras et al 2018, and references therein). However, as recently shown by Feng & Holder (2019), this contribution is >100 and 1000 times lower than the shot noise of DSFG at ℓ=100 and ℓ=1000, respectively. Thus we consider that it has a negligible impact given its extreme weakness.…”

Section: Introductionsupporting

confidence: 51%

Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies

Lagache,

Bethermin,

Montier

et al. 2019

Preprint

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One of the main goals of Cosmology is to search for the imprint of primordial gravitational waves in the cosmic microwave background polarisation field, to probe inflationary theories. One of the obstacles toward the detection of the primordial signal is to extract the cosmic microwave background B-mode polarisation from astrophysical contaminations. Most of efforts focus on limiting Galactic foreground residuals, but extragalactic foregrounds cannot be ignored at large scale (ℓ 150), where the primordial B-modes are the brightest. We present a complete analysis of extragalactic foreground contamination due to polarised emission of radio and dusty star-forming galaxies. We update or use up-to-date models that are validated using the most recent measurements of source number counts, shot noise and cosmic infrared background power spectra. We predict the flux limit (confusion noise) for the future CMB space or balloon experiments (IDS, PIPER, SPIDER, LiteBIRD, PICO), as well as ground-based experiments (C-BASS, NEXT-BASS, QUIJOTE, AdvACTPOL, BICEP3+Keck, BICEPArray, CLASS, SO, SPT3G, S4). Telescope aperture size (and frequency) is the main characteristic impacting the level of confusion noise. Using the flux limits and assuming constant polarisation fractions for radio and dusty galaxies, we compute the B-mode power spectra of the three extragalactic foregrounds (radio source shot noise, dusty galaxy shot noise and clustering), discuss their relative levels and compare their amplitudes to that of the primordial tensor modes parametrized by the "tensor-to-scalar ratio" r. At the reionization bump (ℓ=5), contamination by extragalactic foregrounds is negligible. At the recombination peak (ℓ=80), while the contamination is much lower than the targeted sensitivity on r for large-aperture telescopes, it is at comparable level for some of the medium-(∼1.5m) and small-aperture telescope (≤0.6m) experiments. For example, the contamination is at the level of the 68% confidence level uncertainty on the primordial r for the LiteBIRD and PICO space experiments. These results have been obtained in the absence of multi-frequency component separation (i.e. looking independently at each frequency). We stress that extragalactic foreground contaminations have to be included in the input sky models of component separation methods dedicated to the recovery of the CMB primordial B-mode power spectrum. Finally we also provide some useful unit conversion factors and give some predictions for the SPICA B-BOP experiment, dedicated to Galactic and extragalactic polarisation studies. We show that SPICA B-BOP will be limited at long wavelength by extragalactic foreground contamination for long integration in polarisation, but very short integration in intensity.Lagache et al.: Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies

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Section: Introductionsupporting

confidence: 51%

Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies

Lagache,

Bethermin,

Montier

et al. 2019

Preprint

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“…For temperature lensing reconstruction, several astrophysical contaminants have been identified and treated, like the emission of the cosmic JCAP06(2020)030 infrared background and radio point sources [8,9], the kinematic Sunyaev-Zeldovich (kSZ) effect [10] and the thermal Sunyaev-Zeldovich (tSZ) effect [11]. These effects were found to be less severe or non existent in the CMB polarization channels [12][13][14][15][16][17]. Besides extragalactic foregrounds, diffuse galactic foreground emission due to thermal dust and synchrotron radiation are significant foregrounds to CMB observations in both temperature and polarization.…”

Section: Introductionmentioning

confidence: 99%

Impact of polarized galactic foreground emission on CMB lensing reconstruction and delensing of B-modes

Beck

Errard

Stompor

2020

J. Cosmol. Astropart. Phys.

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Next generation CMB experiments such as CMB-S4 aim at measuring the CMB lensing potential at sub-percent precision where most of the constraining power will come from CMB polarization. We investigate the prospects of achieving this goal in the presence of large-scale, diffuse galactic foreground emission by using non-Gaussian sky simulations and exploit multi-frequency information to clean those. We show that, while prior to foreground cleaning, cosmological parameter estimates from the contaminated lensing potential estimation with the quadratic estimator can be significantly biased, these can be successfully mitigated by applying a parametric foreground cleaning approach. We further observe no significant additional bias in the delensed B-mode power spectrum after applying foreground cleaning and are therefore able to obtain an unbiased measurement of the tensor-to-scalar ratio, r, after delensing with the quadratic estimate of the lensing potential.

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Polarization of the Cosmic Infrared Background Fluctuations

Cited by 2 publications

References 33 publications

Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies

Impact of polarised extragalactic sources on the measurement of CMB B-mode anisotropies

Impact of polarized galactic foreground emission on CMB lensing reconstruction and delensing of B-modes

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