CMB lensing reconstruction biases from masking extragalactic sources

Lembo, Margherita; Fabbian, Giulio; Carron, Julien; Lewis, Antony

doi:10.48550/arxiv.2109.13911

Cited by 6 publications

(6 citation statements)

References 88 publications

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“…4). In short, we use a CMB lensing map that includes signal at the location of tSZ clusters, to avoid biasing our interpretation of the cross-correlation measurements (see, e.g., [58] for further investigation of the effects of cluster masking in CMB lensing maps).…”

Section: B Planck Cmb Lensing Mapsmentioning

confidence: 99%

Constraining the galaxy-halo connection of infrared-selected unWISE galaxies with galaxy clustering and galaxy-CMB lensing power spectra

Kusiak¹,

Bolliet²,

Krolewski³

et al. 2022

Preprint

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We present the first detailed analysis of the connection between galaxies and their dark matter halos for the unWISE galaxy catalog -a full-sky, infrared-selected sample built from WISE data, containing over 500 million galaxies. Using unWISE galaxy-galaxy auto-correlation and Planck CMB lensing-galaxy cross-correlation measurements down to 10 arcmin angular scales, we constrain the halo occupation distribution (HOD), a model describing how central and satellite galaxies are distributed within dark matter halos, for three unWISE galaxy samples at mean redshifts z ≈ 0.6, 1.1, and 1.5. We constrain the characteristic minimum halo mass to host a central galaxy, M HOD min = 1.83 +0.41 −1.63 × 10 12 M /h, 5.22 +0.34 −4.80 × 10 12 M /h, 6.60 +0.30 −1.11 × 10 13 M /h and the mass scale at which one satellite galaxy per halo is found, M 1 = 1.13 +0.32 −0.70 × 10 13 M /h, 1.18 +0.30 −1.11 × 10 13 M /h, 1.23 +0.14 −1.17 × 10 14 M /h for the unWISE samples at z ≈ 0.6, 1.1, and 1.5, respectively. We find that all three samples are dominated by central galaxies, rather than satellites. Using our constrained HOD models, we infer the effective linear galaxy bias for each unWISE sample, and find that it does not evolve as steeply with redshift as found in previous perturbation-theory-based analyses of these galaxies. We discuss possible sources of systematic uncertainty in our results, the most significant of which is the uncertainty on the galaxy redshift distribution. Our HOD constraints provide a detailed, quantitative understanding of how the unWISE galaxies populate the underlying dark matter halo distribution. These constraints will have a direct impact on future studies employing the unWISE galaxies as a cosmological and astrophysical probe, including measurements of ionized gas thermodynamics and dark matter profiles via Sunyaev-Zel'dovich and lensing cross-correlations.

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Section: B Planck Cmb Lensing Mapsmentioning

confidence: 99%

Constraining the galaxy-halo connection of infrared-selected unWISE galaxies with galaxy clustering and galaxy-CMB lensing power spectra

Kusiak¹,

Bolliet²,

Krolewski³

et al. 2022

Preprint

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“…These bias would be, however, significantly mitigated by applying the optimal filtering (see, e.g., Refs. [45,46,70]). We used idealized, full-sky external mass-tracer simulations, which we projected onto the LAT region.…”

Section: Discussionmentioning

confidence: 99%

Simons Observatory: Constraining inflationary gravitational waves with multitracer B -mode delensing

Namikawa¹,

Lizancos²,

Robertson³

et al. 2022

Phys. Rev. D

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We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves by reducing the lensing noise in measurements of the B modes in CMB polarization. SO will initially observe CMB by using three small aperture telescopes and one large-aperture telescope. While polarization maps from small-aperture telescopes will be used to constrain inflationary gravitational waves, the internal CMB lensing maps used to delens will be reconstructed from data from the large-aperture telescope. Since lensing maps obtained from the SO data will be noise dominated on subdegree scales, the SO lensing framework constructs a template for lensinginduced B modes by combining internal CMB lensing maps with maps of the cosmic infrared background from Planck as well as galaxy density maps from the LSST survey. We construct a likelihood for constraining the tensor-to-scalar ratio r that contains auto and cross spectra between observed B modes and the lensing B-mode template. We test our delensing analysis pipeline on map-based simulations containing survey nonidealities, but that, for this initial exploration, does not include contamination from Galactic and extragalactic foregrounds. We find that the SO survey masking and inhomogeneous and atmospheric noise have very little impact on the delensing performance, and the r constraint becomes σðrÞ ≈ 0.0015 which is close to that obtained from the idealized forecasts in the absence of the Galactic foreground and is nearly a factor of 2 tighter than without delensing. We also find that uncertainties in the external large-scale structure tracers used in our multitracer delensing pipeline lead to bias much smaller than the 1σ statistical uncertainties.

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“…Refs. [46,47,69]). We used idealised, full-sky external mass-tracer simulations, which we projected onto the LAT region.…”

Section: Discussionmentioning

confidence: 99%

The Simons Observatory: Constraining inflationary gravitational waves with multi-tracer B-mode delensing

Namikawa,

Lizancos,

Robertson

et al. 2021

Preprint

Self Cite

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We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves (IGWs) by reducing the lensing noise in measurements of the B-modes in CMB polarization. SO will initially observe CMB by using three small aperture telescopes and one large-aperture telescope. While polarization maps from small-aperture telescopes will be used to constrain IGWs, the internal CMB lensing maps used to delens will be reconstructed from data from the large-aperture telescope. Since lensing maps

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CMB lensing reconstruction biases from masking extragalactic sources

Cited by 6 publications

References 88 publications

Constraining the galaxy-halo connection of infrared-selected unWISE galaxies with galaxy clustering and galaxy-CMB lensing power spectra

Constraining the galaxy-halo connection of infrared-selected unWISE galaxies with galaxy clustering and galaxy-CMB lensing power spectra

Simons Observatory: Constraining inflationary gravitational waves with multitracer B -mode delensing

The Simons Observatory: Constraining inflationary gravitational waves with multi-tracer B-mode delensing

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