Galactic chemical evolution in hierarchical formation models - II. The Intracluster Medium
Abstract
We use the cosmological semi-analytic model (SAM) for galaxy formation presented in Paper I to study the metallicities and abundance ratios of the intracluster medium (ICM) within the hierarchical structure formation paradigm. By requiring a slightly flat IMF (x=1.15) and a two-population delay-time-distribution (DTD) for SN Ia explosions we found previously that this model is able to reproduce the abundance ratios and supernova rates of early-type galaxies in the local Universe. Predictions for elemental abundances in the ICM pose a further test of the model. We find that with the fiducial model from Paper I the overall metal content of the ICM is too low, although the abundance ratios are in good agreement with the data. However, we find that allowing a fraction of the metal-enriched material ejected by stars to be deposited directly into the hot ICM, instead of being deposited into the cold ISM, appears to be a plausible and physically-motivated solution.
Keywords
Cite
@article{arxiv.1006.1147,
title = {Galactic chemical evolution in hierarchical formation models - II. The Intracluster Medium},
author = {Matías Arrigoni and Scott C. Trager and Rachel S. Somerville},
journal= {arXiv preprint arXiv:1006.1147},
year = {2010}
}
Comments
8 pages, 6 figures, MNRAS submitted