Laura Bassi Series: Characterisation of AGN population in ~ 10,000 deg² SDSS DR8 redMaPPer galaxy clusters

by Ms Meron Bekabil (Wolkite University)

Thursday 12 May 2022, 14:30 → 15:30 Europe/Rome

Online event

Characterisation of AGN population in ~ 10,000 deg² SDSS DR8 redMaPPer galaxy clusters

 

ABSTRACT:

In this study, we have used an AGN sample of galaxies drawn from the Sloan Digital Sky Survey Data Release 8 (SDSS DR8) and the redMaPPer SDSS galaxy groups and clusters catalog. AGN plays an important role in galaxy formation and evolution, but still, there are many open questions regarding the triggering of nuclear activity in galaxies. In this context, the influence of the environment on AGN activity is still not well understood.

In this work, we wanted to go a step further to study the environmental dependence of cluster richness and AGN distance from cluster center in relation to other properties of active galaxies such as stellar mass, star formation rate, and luminosity, in order to understand better the properties of AGN in galaxy clusters and groups. In addition, we carried out all studies in three redshift ranges, taking into account all z, z < 0.1, and z > 0.1. We also divided the whole sample of AGN into Sy2 and LINERs and carried out all analyses for all classes.In general, for the analyzed sample we have not found significant differences between AGN properties in groups and clusters and those known to be in the field. In addition, we do not find any clear correlation between the studied properties of active galaxies and cluster richness nor the distance from the cluster center. Our findings suggest that in the local universe the environment might not be the fundamental parameter for AGN activity and properties of active galaxies.

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The colloquium will be held online

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