AGN in cosmic voids

CECCARELLI, LAURA

Southampton

Seminario; Southampton Astronomy group Seminars; 2022

Properties of galaxies and their evolution are strongly affected by their local environment. It has also been explored how local environment affects the active galactic nuclei (AGN) phenomena. These studies have positioned cosmic voids and their surrounding regions as promising candidate sites to host AGN galaxies. In this seminar, I will show the results we obtain from the statistical analysis of AGN in cosmic voids and in their surroundings using SDSS data. To this end, we use diverse methods to classify active galaxies, and apply a void finding algorithm to galaxy distributions. The seminar is centered on analysis of galaxy properties related to nuclear activity, and takes into account the relative position with respect to the void center. To start, I will describe the different diagnostic diagrams used to classify galaxies and the void identification algorithm and show some properties of the resulting galaxy samples. Then, I will show the main results on the nuclear activity of galaxies prevailing at voids, and, finally, I will give a brief discussion of our results.