Cross-correlation of Planck CMB lensing with DESI galaxy groups

We measure the cross-correlation between galaxy groups constructed from DESI Legacy Imaging Survey DR8 and Planck CMB lensing, over overlapping sky area of 16876 $\rm deg^2$. The detections are significant and consistent with the expected signal of the large scale structure of the universe, over group samples of various redshift, mass and richness $N_{\rm g}$ and over various scale cuts. The overall S/N is 39 for a conservative sample with $N_{\rm g}\geq 5$, and increases to $48$ for the sample with $N_{\rm g}\geq 2$. Adopting the Planck 2018 cosmology, we constrain the density bias of groups with $N_{\rm g}\geq 5$ as $b_{\rm g}=1.31\pm 0.10$, $2.22\pm 0.10$, $3.52\pm 0.20$ at $0.1

Keywords:

• Scale (descriptive set theory)
• Planck
• Galaxy
• Sky
• Astrophysics
• Cosmic microwave background
• Cosmology
• Redshift
• Galaxy group
• Physics

• Correction
• Source
• Cite
• Save
• Machine Reading By IdeaReader