Angular power spectrum of galaxies in the 2MASS Redshift Survey

Abstract

We present the measurement and interpretation of the angular power spectrum of nearby galaxies in the 2MASS Redshift Survey catalogue with spectroscopic redshifts up to z ≈ 0.1. We detect the angular power spectrum up to a multipole of ℓ ≈ 1000.We find that themeasured power spectrum is dominated by galaxies living inside nearby galaxy clusters and groups.We use the halo occupation distribution (HOD) formalism tomodel the power spectrum, obtaining a fit with reasonable parameters. These HOD parameters are in agreement with the 2MASS galaxy distribution we measure towards the known nearby galaxy clusters, confirming validity of our analysis.