Study of AGN contribution on morphological parameters of their host galaxies
Abstract
We tested how the AGN contribution (5% - 75% of the total flux) may affect different morphological parameters commonly used in galaxy classification. We carried out all analysis at ,,0 and at higher redshifts that correspond to the COSMOS field. Using a local training sample of ,2000 visually classified galaxies, we carried out all measurements with and without the central source and quantified how the contribution of a bright nuclear point source could affect different morphological parameters, such as: Abraham and Concelice-Bershady indices, Gini, Asymmetry, moment of light, and Smoothness. We found that concentration indexes are less sensitive to both redshift and brightness in comparison to the other parameters. We also found that all parameters change significantly with AGN contribution. At 0, up to a 10% of AGN contribution the morphological classification will not be significantly affect, but for 25% of AGN contribution late-type spirals follow the range of parameters of elliptical galaxies and can therefore be misclassified early types.
Cite
@article{arxiv.2004.02250,
title = {Study of AGN contribution on morphological parameters of their host galaxies},
author = {Tilahun Getachew-Woreta and Mirjana Pović and Josefa Masegosa and Jaime Perea and Zeleke Beyoro-Amado and Isabel Marquez Perez},
journal= {arXiv preprint arXiv:2004.02250},
year = {2022}
}
Comments
Proceedings paper of the IAU symposium "Nuclear Activity in Galaxies Across Cosmic Time" (Ethiopia) accepted to be published under the Cambridge University Press, eds. M. Povi\'c, P. Marziani, J. Masegosa, H. Netzer, S. H. Negu, and S. B. Tessema