تقرير
The Atacama Cosmology Telescope: Cosmology from cross-correlations of unWISE galaxies and ACT DR6 CMB lensing
| العنوان: | The Atacama Cosmology Telescope: Cosmology from cross-correlations of unWISE galaxies and ACT DR6 CMB lensing |
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| المؤلفون: | Farren, Gerrit S., Krolewski, Alex, MacCrann, Niall, Ferraro, Simone, Abril-Cabezas, Irene, An, Rui, Atkins, Zachary, Battaglia, Nicholas, Bond, J. Richard, Calabrese, Erminia, Choi, Steve K., Darwish, Omar, Devlin, Mark J., Duivenvoorden, Adriaan J., Dunkley, Jo, Hill, J. Colin, Hilton, Matt, Huffenberger, Kevin M., Kim, Joshua, Louis, Thibaut, Madhavacheril, Mathew S., Marques, Gabriela A., Moodley, Kavilan, Page, Lyman A., Partridge, Bruce, Qu, Frank J., Schaan, Emmanuel, Sehgal, Neelima, Sherwin, Blake D., Sifón, Cristóbal, Staggs, Suzanne T., Van Engelen, Alexander, Vargas, Cristian, Wenzl, Lukas, White, Martin, Wollack, Edward J. |
| المصدر: | 2024 ApJ 966 157 |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We present tomographic measurements of structure growth using cross-correlations of Atacama Cosmology Telescope (ACT) DR6 and Planck CMB lensing maps with the unWISE Blue and Green galaxy samples, which span the redshift ranges $0.2 \lesssim z \lesssim 1.1$ and $0.3 \lesssim z \lesssim 1.8$, respectively. We improve on prior unWISE cross-correlations not just by making use of the new, high-precision ACT DR6 lensing maps, but also by including additional spectroscopic data for redshift calibration and by analysing our measurements with a more flexible theoretical model. An extensive suite of systematic and null tests within a blind analysis framework ensures that our results are robust. We determine the amplitude of matter fluctuations at low redshifts ($z\simeq 0.2-1.6$), finding $S_8 \equiv \sigma_8 (\Omega_m / 0.3)^{0.5} = 0.813 \pm 0.021$ using the ACT cross-correlation alone and $S_8 = 0.810 \pm 0.015$ with a combination of Planck and ACT cross-correlations; these measurements are fully consistent with the predictions from primary CMB measurements assuming standard structure growth. The addition of Baryon Acoustic Oscillation data breaks the degeneracy between $\sigma_8$ and $\Omega_m$, allowing us to measure $\sigma_8 = 0.813 \pm 0.020$ from the cross-correlation of unWISE with ACT and $\sigma_8 = 0.813\pm 0.015$ from the combination of cross-correlations with ACT and Planck. These results also agree with the expectations from primary CMB extrapolations in $\Lambda$CDM cosmology; the consistency of $\sigma_8$ derived from our two redshift samples at $z \sim 0.6$ and $1.1$ provides a further check of our cosmological model. Our results suggest that structure formation on linear scales is well described by $\Lambda$CDM even down to low redshifts $z\lesssim 1$. Comment: 73 pages (incl. 31 pages of appendices), 52 figures, 16 tables, published in ApJ. Watch G. S. Farren and A. Krolewski discuss the analysis and results under https://cosmologytalks.com/2023/09/11/act-unwise |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ad31a5 |
| URL الوصول: | http://arxiv.org/abs/2309.05659 |
| رقم الأكسشن: | edsarx.2309.05659 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ad31a5 |
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