Advanced ACTPol Cryogenic Detector Arrays and Readout

Henderson, S.; Allison, Rupert; Austermann, J. E.; Baildon, Taylor; Battaglia, Nick; Beall, James A.; Becker, Daniel; Bernardis, Francesco De; Bond, J. R.; Calabrese, E.; Choi, Steve K.; Coughlin, Kevin; Crowley, Kevin T.; Datta, Rahul; Devlin, Mark J.; Duff, Shannon M.; Dunkley, Joanna; Dünner, Rolando; Engelen, Alexander van; Gallardo, Patricio A.; Grace, E.; Hasselfield, Matthew; Hills, Felicity B.; Hilton, G. C.; Hincks, Adam D.; Hložek, Renée; Ho, Shuay-Pwu Patty; Hubmayr, J.; Huffenberger, K. M.; Hughes, John P.; Irwin, K. D.; Koopman, Brian J.; Kosowsky, Arthur; Li, D.; McMahon, Jeffrey; Munson, Charles; Nati, F.; Newburgh, Laura; Niemack, Michael D.; Niraula, P.; Page, Lyman A.; Pappas, Christine G.; Salatino, Maria; Schillaci, A.; Schmitt, Benjamin L.; Sehgal, Neelima; Sherwin, Blake D.; Sievers, Jonathan; Simon, Sara M.; Spergel, David N.; Staggs, Suzanne T.; Stevens, Jason R.; Thornton, Robert J.; Lanen, Jeff Van; Vavagiakis, Eve M.; Ward, Jennifer E.; Wollack, Edward J.

doi:10.1007/s10909-016-1575-z

Cited by 342 publications

(334 citation statements)

References 34 publications

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“…We consider three idealized CMB experiments, summarized in Table I: 8 one with characteristics similar to the recent Planck SMICA component-separated map [32], one similar to the nominal specifications of ongoing Stage-3 experiments (which we will denote by CMB-S3) such as AdvACT [33], and finally a CMB-S4-like experiment [34]. 9 We consider lensing reconstruction from temperature anisotropies only and choose a multipole range from min = 30 to max = 4000 or max = 3000 for the reconstruction in our fiducial analysis.…”

Section: Numerical Results For Current and Upcoming Surveys A Exmentioning

confidence: 99%

“…The CMB lensing power spectrum will be measured with signal-to-noise (S/N ) > 100 by ongoing and upcoming experiments, including the Advanced Atacama Cosmology Telescope (AdvACT) [33], the South Pole Telescope-3G (SPT-3G) [48], the Simons Observatory 1 , and CMB Stage-4 2 (CMB-S4) [34]. At this level of precision, sub-percent control is required on possible biases in CMB lensing reconstruction.…”

Section: Introductionmentioning

confidence: 99%

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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: Numerical Results For Current and Upcoming Surveys A Exmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Since this initial detection several other detections have followed from multiple CMB experiments, cross-correlating with other galaxy catalogs using various estimators (Planck Collaboration et al 2016;Schaan et al 2016;Hill et al 2016;Soergel et al 2016;De Bernardis et al 2016), as well as from one galaxy cluster (Sayers et al 2013). Forecasts for kSZ measurements from high-resolution CMB experiments such as AdvACT (Henderson et al 2016), the South Pole Telescope-3G (SPT-3G; Benson et al 2014), and the proposed CMB Stage 4 (CMB-S4) experiment show substantial improvements Ferraro et al 2016) over the current measurements. If kSZ measurements are to fulfill their full cosmological constraining power potential then an understanding of the systematics associated with the optical depth of galaxies and clusters is paramount.…”

Section: Introductionmentioning

confidence: 99%

The tau of galaxy clusters

Battaglia

2016

J. Cosmol. Astropart. Phys.

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104

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The recent emergence of detections of the kinetic Sunyaev-Zel'dovich (kSZ) effect through crosscorrelation techniques is encouraging for the prospects of future cosmic microwave background (CMB) experiments. Extracting information on the large-scale velocity fields and constraining cosmological parameters from such kSZ measurements requires an understanding of the optical depth to CMB photons through halos. Using cosmological hydrodynamic simulations we find that there exists a low-scatter relation between the optical depth and thermal Sunyaev-Zel'dovich (tSZ) signal of halos within a physical aperture. We propose that such a relation can be used to break the degeneracy between optical depth and line-of-sight velocity in kSZ measurements. The limiting factors in our proposal are systematic uncertainties associated with the sub-grid physics models in the simulations, which we calculate to be less than 10 percent. We discuss future observational measurements that could potentially be used to mitigate the systematic uncertainties in this scaling relation.

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“…Future CMB missions-including Advanced ACTPol [28], SPT-3G [29], CMB Stage-IV [30], Simons Observatory 1 , Simons Array [31], CORE [32], LiteBIRD [33], PIXIE [34]-will test the Universe over a wide range of scales with unprecedented accuracy. The same accuracy will enable the reconstruction of the weak lensing signal from the CMB maps down to the smallest scales and with high sensitivity, providing an additional probe of the distribution and evolution of structures in the universe.…”

Section: Introductionmentioning

confidence: 99%

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

2018

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Cosmological observations are a powerful probe of neutrino properties, and in particular of their mass. In this review, we first discuss the role of neutrinos in shaping the cosmological evolution at both the background and perturbation level, and describe their effects on cosmological observables such as the cosmic microwave background and the distribution of matter at large scale. We then present the state of the art concerning the constraints on neutrino masses from those observables, and also review the prospects for future experiments. We also briefly discuss the prospects for determining the neutrino hierarchy from cosmology, the complementarity with laboratory experiments, and the constraints on neutrino properties beyond their mass.

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Advanced ACTPol Cryogenic Detector Arrays and Readout

Cited by 342 publications

References 34 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

The tau of galaxy clusters

Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints

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