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Atacama Cosmology Telescope: Multiprobe cosmology with unWISE galaxies and ACT DR6 CMB lensing

Gerrit S. Farren, Alex Krolewski, Frank J. Qu, Simone Ferraro, Erminia Calabrese, Jo Dunkley, Carmen Embil Villagra, J. Colin Hill, Joshua Kim, Mathew S. Madhavacheril, Kavilan Moodley, Lyman A. Page, Bruce Partridge, Neelima Sehgal, Blake D. Sherwin, Cristobál Sifón, Suzanne T. Staggs, Alexander van Engelen, Edward J. Wollack

2025Physical review. D/Physical review. D.12 citationsDOIOpen Access PDF

Abstract

We present a joint analysis of the cosmic microwave background (CMB) lensing power spectra measured from the Data Release 6 of the Atacama Cosmology Telescope (ACT) and PR4, cross-correlations between the ACT and lensing reconstruction and galaxy clustering from unWISE, and the unWISE clustering auto-spectrum. We obtain 1.5% constraints on the matter density fluctuations at late times parametrized by the best constrained parameter combination <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:msubsup> <a:mrow> <a:mi>S</a:mi> </a:mrow> <a:mrow> <a:mn>8</a:mn> </a:mrow> <a:mrow> <a:mn>3</a:mn> <a:mi mathvariant="normal">x</a:mi> <a:mn>2</a:mn> <a:mi>pt</a:mi> </a:mrow> </a:msubsup> <a:mo>≡</a:mo> <a:msub> <a:mrow> <a:mi>σ</a:mi> </a:mrow> <a:mrow> <a:mn>8</a:mn> </a:mrow> </a:msub> <a:mo stretchy="false">(</a:mo> <a:msub> <a:mrow> <a:mi mathvariant="normal">Ω</a:mi> </a:mrow> <a:mrow> <a:mi>m</a:mi> </a:mrow> </a:msub> <a:mo>/</a:mo> <a:mn>0.3</a:mn> <a:msup> <a:mrow> <a:mo stretchy="false">)</a:mo> </a:mrow> <a:mrow> <a:mn>0.4</a:mn> </a:mrow> </a:msup> <a:mo>=</a:mo> <a:mn>0.815</a:mn> <a:mo>±</a:mo> <a:mn>0.012</a:mn> </a:mrow> </a:math> . The commonly used <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msub> <g:mi>S</g:mi> <g:mn>8</g:mn> </g:msub> <g:mo>≡</g:mo> <g:msub> <g:mi>σ</g:mi> <g:mn>8</g:mn> </g:msub> <g:mo stretchy="false">(</g:mo> <g:msub> <g:mi mathvariant="normal">Ω</g:mi> <g:mi>m</g:mi> </g:msub> <g:mo>/</g:mo> <g:mn>0.3</g:mn> <g:msup> <g:mo stretchy="false">)</g:mo> <g:mn>0.5</g:mn> </g:msup> </g:math> parameter is constrained to <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"> <l:msub> <l:mi>S</l:mi> <l:mn>8</l:mn> </l:msub> <l:mo>=</l:mo> <l:mn>0.816</l:mn> <l:mo>±</l:mo> <l:mn>0.015</l:mn> </l:math> . In combination with baryon acoustic oscillation (BAO) measurements we find <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"> <n:msub> <n:mi>σ</n:mi> <n:mn>8</n:mn> </n:msub> <n:mo>=</n:mo> <n:mn>0.815</n:mn> <n:mo>±</n:mo> <n:mn>0.012</n:mn> </n:math> . We also present sound-horizon-independent estimates of the present day Hubble rate of <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"> <p:mrow> <p:msub> <p:mrow> <p:mi>H</p:mi> </p:mrow> <p:mrow> <p:mn>0</p:mn> </p:mrow> </p:msub> <p:mo>=</p:mo> <p:msubsup> <p:mrow> <p:mn>66.4</p:mn> </p:mrow> <p:mrow> <p:mo>−</p:mo> <p:mn>3.7</p:mn> </p:mrow> <p:mrow> <p:mo>+</p:mo> <p:mn>3.2</p:mn> </p:mrow> </p:msubsup> <p:mtext> </p:mtext> <p:mtext> </p:mtext> <p:mi>km</p:mi> <p:mtext> </p:mtext> <p:msup> <p:mrow> <p:mi mathvariant="normal">s</p:mi> </p:mrow> <p:mrow> <p:mo>−</p:mo> <p:mn>1</p:mn> </p:mrow> </p:msup> <p:mtext> </p:mtext> <p:msup> <p:mrow> <p:mi>Mpc</p:mi> </p:mrow> <p:mrow> <p:mo>−</p:mo> <p:mn>1</p:mn> </p:mrow> </p:msup> </p:mrow> </p:math> from our large scale structure data alone and <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"> <s:msub> <s:mi>H</s:mi> <s:mn>0</s:mn> </s:msub> <s:mo>=</s:mo> <s:msubsup> <s:mn>64.3</s:mn> <s:mrow> <s:mo>−</s:mo> <s:mn>2.4</s:mn> </s:mrow> <s:mrow> <s:mo>+</s:mo> <s:mn>2.1</s:mn> </s:mrow> </s:msubsup> <s:mtext> </s:mtext> <s:mtext> </s:mtext> <s:mi>km</s:mi> <s:mtext> </s:mtext> <s:msup> <s:mi mathvariant="normal">s</s:mi> <s:mrow> <s:mo>−</s:mo> <s:mn>1</s:mn> </s:mrow> </s:msup> <s:mtext> </s:mtext> <s:msup> <s:mrow> <s:mi>Mpc</s:mi> </s:mrow> <s:mrow> <s:mo>−</s:mo> <s:mn>1</s:mn> </s:mrow> </s:msup> </s:math> in combination with uncalibrated supernovae from . Using parametric estimates of the evolution of matter density fluctuations, we place constraints on cosmic structure in a range of high redshifts typically inaccessible with cross-correlation analyses. Combining lensing cross- and autocorrelations, we derive a 3.3% constraint on the integrated matter density fluctuations above <v:math xmlns:v="http://www.w3.org/1998/Math/MathML" display="inline"> <v:mi>z</v:mi> <v:mo>=</v:mo> <v:mn>2.4</v:mn> </v:math> , one of the tightest constraints in this redshift range and fully consistent with a <x:math xmlns:x="http://www.w3.org/1998/Math/MathML" display="inline"> <x:mrow> <x:mi mathvariant="normal">Λ</x:mi> </x:mrow> </x:math> cold dark matter ( <ab:math xmlns:ab="http://www.w3.org/1998/Math/MathML" display="inline"> <ab:mi mathvariant="normal">Λ</ab:mi> <ab:mi>CDM</ab:mi> </ab:math> ) model fit to the primary CMB from . Finally, combining with primary CMB observations and using the extended low redshift coverage of these combined datasets we derive constraints on a variety of extensions to the <db:math xmlns:db="http://www.w3.org/1998/Math/MathML" display="inline"> <db:mi mathvariant="normal">Λ</db:mi> <db:mi>CDM</db:mi> </db:math> model including massive neutrinos, spatial curvature, and dark energy. We find in flat <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"> <gb:mi mathvariant="normal">Λ</

Topics & Concepts

PhysicsCosmologyCosmic microwave backgroundGalaxyAstrophysicsLarge Synoptic Survey TelescopeWeak gravitational lensingAstronomyTelescopeGravitational lensRedshiftOpticsAnisotropyGalaxies: Formation, Evolution, PhenomenaCosmology and Gravitation TheoriesSuperconducting and THz Device Technology
Atacama Cosmology Telescope: Multiprobe cosmology with unWISE galaxies and ACT DR6 CMB lensing | Litcius