Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Baxter, Eric J.; Clampitt, Joseph; Giannantonio, T.; Dodelson, Scott; Jain, Bhuvnesh; Huterer, Dragan; Bleem, L. E.; Crawford, T. M.; Efstathiou, G.; Fosalba, P.; Kirk, D.; Kwan, Juliana; Sánchez, C.; Story, K. T.; Troxel, M. A.; Abbott, T. M. C.; Abdalla, F. B.; Armstrong, R.; Benoit-Lévy, A.; Benson, B. A.; Bernstein, G. M.; Bernstein, R. A.; Bertin, E.; Brooks, D.; Carlstrom, J. E.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Chown, R.; Crocce, M.; Cunha, C. E.; Costa, L. N. da; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Evrard, A. E.; Neto, A. Fausti; Flaugher, B.; Frieman, J.; Gruen, D.; Gruendl, R. A.; Gutiérrez, G.; Haan, T. de; Holder, G. P.; Honscheid, K.; Hou, Z.; James, D. J.; Kuêhn, K.; Kuropatkin, N.; Lima, M.; March, M.; Marshall, J. L.; Martini, Paul; Melchior, P.; Miller, C. J.; Miquel, R.; Mohr, J. J.; Nord, B.; Omori, Y.; Plazas, A. A.; Reichardt, C. L.; Romer, A. K.; Rykoff, E. S.; Sánchez, E.; Sevilla-Noarbe, I.; Sheldon, E.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Stark, A. A.; Swanson, M. E. C.; Tarlè, G.; Thomas, Daniel; Walker, A. R.; Wechsler, Risa H.

doi:10.1093/mnras/stw1584

Cited by 66 publications

(76 citation statements)

References 59 publications

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“…Thus, the kSZ-induced bias is many times larger than the projected statistical errors on the cross-correlation. The kSZ-induced bias thus requires careful treatment for efforts to calibrate the galaxy shear multiplicative bias via such cross-correlations [22,[57][58][59][60][61], as well as for constraints on cosmology.…”

Section: Results: Cross-correlation With Tracersmentioning

confidence: 99%

Bias to CMB lensing reconstruction from temperature anisotropies due to large-scale galaxy motions

Ferraro

Hill

2018

Phys. Rev. D

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Gravitational lensing of the cosmic microwave background (CMB) is expected to be amongst the most powerful cosmological tools for ongoing and upcoming CMB experiments. In this work, we investigate a bias to CMB lensing reconstruction from temperature anisotropies due to the kinematic Sunyaev-Zel'dovich (kSZ) effect, that is, the Doppler shift of CMB photons induced by Compton-scattering off moving electrons. The kSZ signal yields biases due to both its own intrinsic non-Gaussianity and its non-zero cross-correlation with the CMB lensing field (and other fields that trace the large-scale structure). This kSZ-induced bias affects both the CMB lensing auto-power spectrum and its cross-correlation with low-redshift tracers. Furthermore, it cannot be removed by multifrequency foreground separation techniques because the kSZ effect preserves the blackbody spectrum of the CMB. While statistically negligible for current datasets, we show that it will be important for upcoming surveys, and failure to account for it can lead to large biases in constraints on neutrino masses or the properties of dark energy. For a Stage 4 CMB experiment, the bias can be as large as ≈ 15% or 12% in cross-correlation with LSST galaxy lensing convergence or galaxy overdensity maps, respectively, when the maximum temperature multipole used in the reconstruction is max = 4000, and about half of that when max = 3000. Similarly, we find that the CMB lensing auto-power spectrum can be biased by up to several percent. These biases are many times larger than the expected statistical errors. We validate our analytical predictions with cosmological simulations and present the first complete estimate of secondary-induced CMB lensing biases. The predicted bias is sensitive to the small-scale gas distribution, which is affected by pressure and feedback mechanisms, thus making removal via "bias-hardened" estimators challenging. Reducing max can significantly mitigate the bias at the cost of a decrease in the overall lensing reconstruction signal-tonoise. A bias 1% on large scales requires max 2000, which leads to a reduction in signal-to-noise by a factor of ≈ 3 − 5 for a Stage 4 CMB experiment. Polarization-only reconstruction may be the most robust mitigation strategy.

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Section: Results: Cross-correlation With Tracersmentioning

confidence: 99%

Bias to CMB lensing reconstruction from temperature anisotropies due to large-scale galaxy motions

Ferraro

Hill

2018

Phys. Rev. D

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“…A number of cross-correlations between a lensing map produced from a small SPT patch and DES SV data, which covered ∼140 deg 2 have been measured to date: crosscorrelation with galaxy density (Giannantonio et al 2016), galaxy shear (Kirk et al 2015), and the ratio between galaxygalaxy lensing and galaxy CMB lensing (Baxter et al 2016). With future DES releases, which will have more than 2000 deg 2 overlap, these measurements are expected to improve significantly, allowing us to place tighter cosmological parameter constraints.…”

Section: Discussionmentioning

confidence: 99%

A 2500 deg² CMB Lensing Map from Combined South Pole Telescope and Planck Data

Omori

Chown

Simard

et al. 2017

ApJ

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127

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We present a cosmic microwave background (CMB) lensing map produced from a linear combination of South Pole Telescope (SPT) and Planck temperature data. The 150 GHz temperature data from the 2500 deg 2 SPT-SZ survey is combined with the Planck 143 GHz data in harmonic space to obtain a temperature map that has a broader ℓ coverage and less noise than either individual map. Using a quadratic estimator technique on this combined temperature map, we produce a map of the gravitational lensing potential projected along the line of sight. We measure the auto-spectrum of the lensing potential ff C L , and compare it to the theoretical prediction for a ΛCDM cosmology consistent with the Planck 2015 data set, finding a best-fit amplitude of . The null hypothesis of no lensing is rejected at a significance of 24σ. One important use of such a lensing potential map is in cross-correlations with other dark matter tracers. We demonstrate this cross-correlation in practice by calculating the cross-spectrum, between the SPT+Planck lensing map andWide-field Infrared Survey Explorer (WISE) galaxies. We fitwith a, L 0 , and b fixed, and find h = =0.04 , which is marginally lower, but in good agreement with h = f -+ 1.000.02 , the best-fit amplitude for the cross-correlation of Planck-2015 CMB lensing and WISE galaxies over ∼67% of the sky. The lensing potential map presented here will be used for cross-correlation studies with the Dark Energy Survey, whose footprint nearly completely covers the SPT 2500 deg 2 field.

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“…The first applications of CMB lensing cross-correlation in cosmological analysis have been reported in Refs. [24][25][26] and, more recently, in Refs. [27][28][29], while the most advanced and comprehensive studies in the field have been recently published by the DES and SPT collaborations [30,31]; for future galaxy surveys, such as Euclid and LSST, this approach is destined to become the standard baseline analysis to obtain cosmological constraints [15,32,33].…”

mentioning

confidence: 91%

CMB lensing reconstruction biases in cross-correlation with large-scale structure probes

Fabbian

Lewis

Beck

2019

J. Cosmol. Astropart. Phys.

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Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Cited by 66 publications

References 59 publications

Bias to CMB lensing reconstruction from temperature anisotropies due to large-scale galaxy motions

Bias to CMB lensing reconstruction from temperature anisotropies due to large-scale galaxy motions

A 2500 deg² CMB Lensing Map from Combined South Pole Telescope and Planck Data

CMB lensing reconstruction biases in cross-correlation with large-scale structure probes

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Joint measurement of lensing–galaxy correlations using SPT and DES SV data

Cited by 66 publications

References 59 publications

Bias to CMB lensing reconstruction from temperature anisotropies due to large-scale galaxy motions

Bias to CMB lensing reconstruction from temperature anisotropies due to large-scale galaxy motions

A 2500 deg2 CMB Lensing Map from Combined South Pole Telescope and Planck Data

CMB lensing reconstruction biases in cross-correlation with large-scale structure probes

Contact Info

Product

Resources

About

A 2500 deg² CMB Lensing Map from Combined South Pole Telescope and Planck Data