Problems of Clustering of Radiogalaxies

TL;DR

This paper analyzes the clustering properties of radio-identified galaxies, revealing differences in their spatial distribution compared to optically observed galaxies and between different galaxy types.

Contribution

It provides the first detailed clustering analysis of a radio galaxy sample, highlighting differences from optical galaxy clustering and between AGN and starburst galaxies.

Findings

Radio galaxies have lower correlation length than optical galaxies.

Steeper slope in the autocorrelation function for radio galaxies.

Possible clustering differences between AGN and starburst galaxies.

Abstract

We present the preliminary analysis of clustering of a sample of 1157 radio-identified galaxies from Machalski & Condon (1999). We found that for separations $2-15 h^{-1}$Mpc their redshift space autocorrelation function $\xi(s)$ can be approximated by the power law with the correlation length $\sim 3.75h^{-1}$Mpc and slope $\gamma \sim 1.8$. The correlation length for radiogalaxies is found to be lower and the slope steeper than the corresponding parameters of the control sample of optically observed galaxies. Analysis the projected correlation function $\Xi(r)$ displays possible differences in the clustering properties between active galactic nuclei (AGN) and starburst (SB) galaxies.