DES-Y3 galaxies & ACT DR4 CMB lensing tomography
- Fermilab
We present a measurement of the cross-correlation between the \maglim galaxies selected from the Dark Energy Survey (DES) first three years of observations (Y3) and cosmic microwave background (CMB) lensing from the Atacama Cosmology Telescope (ACT) Data Release 4 (DR4), reconstructed over $$\sim 436$$ $$\sqdeg$$ of the sky. Our galaxy sample, which covers $$\sim 4143$$ $$\sqdeg$$, is divided into six redshift bins spanning the redshift range of $0.20<1.05$. We adopt a blinding procedure until passing all consistency and systematics tests. After imposing scale cuts for the cross-power spectrum measurement, we reject the null hypothesis of no correlation at 9.1$$\sigma$$. We constrain cosmological parameters from a joint analysis of galaxy and CMB lensing-galaxy power spectra considering a flat \LCDM model, marginalized over 23 astrophysical and systematic nuisance parameters. We find the clustering amplitude $$S_8\equiv \sigma_8 (\Omega_m/0.3)^{0.5} = 0.75^{+0.04}_{-0.05}$$. In addition, we co nstrain the linear growth of cosmic structure as a function of redshift. Our results are consistent with recent DES Y3 analyses and suggest a preference for a lower $$S_8$$ compared to results from measurements of CMB anisotropies by the \textit{Planck} satellite, although at a mild level ($$< 2 \sigma$$) of statistical significance.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- DES
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 2007017
- Report Number(s):
- FERMILAB-SLIDES-23-216-AD-PPD; oai:inspirehep.net:2703761
- Country of Publication:
- United States
- Language:
- English
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