The Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI Legacy Imaging galaxies and CMB lensing from ACT DR6 and Planck PR4
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| Format: | Preprint |
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2024
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| author | Qu, Frank J. Hang, Qianjun Farren, Gerrit Bolliet, Boris Aguilar, Jessica Nicole Ahlen, Steven Alam, Shadab Brooks, David Cai, Yan-Chuan Calabrese, Erminia Claybaugh, Todd de la Macorra, Axel Devlin, Mark J. Doel, Peter Embil-Villagra, Carmen Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gluscevic, Vera Gontcho, Satya Gontcho A Gutierrez, Gaston Howlett, Cullan Kehoe, Robert Kim, Joshua Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Louis, Thibaut Meisner, Aaron Miquel, Ramon Moustakas, John Newman, Jeffrey A. Niz, Gustavo Peacock, John Percival, Will Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Sehgal, Neelima Shaikh, Shabbir Sherwin, Blake Sifón, Cristóbal Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Wollack, Edward J. Zou, Hu |
| author_facet | Qu, Frank J. Hang, Qianjun Farren, Gerrit Bolliet, Boris Aguilar, Jessica Nicole Ahlen, Steven Alam, Shadab Brooks, David Cai, Yan-Chuan Calabrese, Erminia Claybaugh, Todd de la Macorra, Axel Devlin, Mark J. Doel, Peter Embil-Villagra, Carmen Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gluscevic, Vera Gontcho, Satya Gontcho A Gutierrez, Gaston Howlett, Cullan Kehoe, Robert Kim, Joshua Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Louis, Thibaut Meisner, Aaron Miquel, Ramon Moustakas, John Newman, Jeffrey A. Niz, Gustavo Peacock, John Percival, Will Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Sehgal, Neelima Shaikh, Shabbir Sherwin, Blake Sifón, Cristóbal Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Wollack, Edward J. Zou, Hu |
| contents | We measure the growth of cosmic density fluctuations on large scales and across the redshift range $0.3<z<0.8$ through the cross-correlation of the ACT DR6 CMB lensing map and galaxies from the DESI Legacy Survey, using three galaxy samples spanning the redshifts of $0.3 \lesssim z \lesssim 0.45$, $0.45 \lesssim z \lesssim0.6$, $0.6 \lesssim z \lesssim 0.8$. We adopt a scale cut where non-linear effects are negligible, so that the cosmological constraints are derived from the linear regime. We determine the amplitude of matter fluctuations over all three redshift bins using ACT data alone to be $S_8\equivσ_8(Ω_m/0.3)^{0.5}=0.772\pm0.040$ in a joint analysis combining the three redshift bins and ACT lensing alone. Using a combination of ACT and \textit{Planck} data we obtain $S_8=0.765\pm0.032$. The lowest redshift bin used is the least constraining and exhibits a $\sim2σ$ tension with the other redshift bins; thus we also report constraints excluding the first redshift bin, giving $S_8=0.785\pm0.033$ for the combination of ACT and \textit{Planck}. This result is in excellent agreement at the $0.3σ$ level with measurements from galaxy lensing, but is $1.8σ$ lower than predictions based on \textit{Planck} primary CMB data. Understanding whether this hint of discrepancy in the growth of structure at low redshifts arises from a fluctuation, from systematics in data, or from new physics, is a high priority for forthcoming CMB lensing and galaxy cross-correlation analyses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10808 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI Legacy Imaging galaxies and CMB lensing from ACT DR6 and Planck PR4 Qu, Frank J. Hang, Qianjun Farren, Gerrit Bolliet, Boris Aguilar, Jessica Nicole Ahlen, Steven Alam, Shadab Brooks, David Cai, Yan-Chuan Calabrese, Erminia Claybaugh, Todd de la Macorra, Axel Devlin, Mark J. Doel, Peter Embil-Villagra, Carmen Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gluscevic, Vera Gontcho, Satya Gontcho A Gutierrez, Gaston Howlett, Cullan Kehoe, Robert Kim, Joshua Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Louis, Thibaut Meisner, Aaron Miquel, Ramon Moustakas, John Newman, Jeffrey A. Niz, Gustavo Peacock, John Percival, Will Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Sehgal, Neelima Shaikh, Shabbir Sherwin, Blake Sifón, Cristóbal Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Wollack, Edward J. Zou, Hu Cosmology and Nongalactic Astrophysics We measure the growth of cosmic density fluctuations on large scales and across the redshift range $0.3<z<0.8$ through the cross-correlation of the ACT DR6 CMB lensing map and galaxies from the DESI Legacy Survey, using three galaxy samples spanning the redshifts of $0.3 \lesssim z \lesssim 0.45$, $0.45 \lesssim z \lesssim0.6$, $0.6 \lesssim z \lesssim 0.8$. We adopt a scale cut where non-linear effects are negligible, so that the cosmological constraints are derived from the linear regime. We determine the amplitude of matter fluctuations over all three redshift bins using ACT data alone to be $S_8\equivσ_8(Ω_m/0.3)^{0.5}=0.772\pm0.040$ in a joint analysis combining the three redshift bins and ACT lensing alone. Using a combination of ACT and \textit{Planck} data we obtain $S_8=0.765\pm0.032$. The lowest redshift bin used is the least constraining and exhibits a $\sim2σ$ tension with the other redshift bins; thus we also report constraints excluding the first redshift bin, giving $S_8=0.785\pm0.033$ for the combination of ACT and \textit{Planck}. This result is in excellent agreement at the $0.3σ$ level with measurements from galaxy lensing, but is $1.8σ$ lower than predictions based on \textit{Planck} primary CMB data. Understanding whether this hint of discrepancy in the growth of structure at low redshifts arises from a fluctuation, from systematics in data, or from new physics, is a high priority for forthcoming CMB lensing and galaxy cross-correlation analyses. |
| title | The Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI Legacy Imaging galaxies and CMB lensing from ACT DR6 and Planck PR4 |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2410.10808 |