Gravity at Work: How the Build-Up of Environments Shape Galaxy Properties
Abstract
We present results on the heating of the inter-cluster medium (ICM) by gravitational potential energy from in-falling satellites. We calculate the available excess energy of baryons once they are stripped from their satellite and added to the ICM of the hosting environment. this excess energy is a strong function of environment and we find that it can exceed the contribution from AGNs or supernovae (SN) by up to two orders of magnitude in the densest environments/haloes. Cooling by radiative losses is in general fully compensated by gravitational heating in massive groups and clusters with hot gas temperature > 1 keV. The reason for the strong environment dependence is the continued infall of substructure onto dense environments during their formation in contrast to field-like environments. We show that gravitational heating is able to reduce the number of too luminous galaxies in models and to produce model luminosity functions in agreement with observations.
Keywords
Cite
@article{arxiv.1101.2062,
title = {Gravity at Work: How the Build-Up of Environments Shape Galaxy Properties},
author = {Sadegh Khochfar},
journal= {arXiv preprint arXiv:1101.2062},
year = {2015}
}
Comments
8 pages, 3 figures. To be published in Proceedings of JENAM 2010, Symposium 2: "Environment and the formation of galaxies: 30 years later"