Accounting for Anomalously High Metal Production in Galaxy Clusters

Type Conference Paper
Names Brian J. Morsony, C. Heath, J. C. Workman
Conference Name American Astronomical Society Meeting Abstracts, #221, #226.06
Volume 221
Date January 1, 2013
URL http://adsabs.harvard.edu/abs/2013AAS...22122606M
Library Catalog NASA ADS
Abstract The total mass of metal in galaxy clusters, including metal in stars and the ICM, is more than is expected to be produced by a standard stellar initial mass function. We set out to determine what modifications are needed to reproduce the observed metal enhancement. Modifications include expanding the IMF to high mass (>130 M_sun) stars and including metal production from pair-instability supernovae, using an enhanced type-Ia SN rate, and using various modifications of the IMF to make it more top-heavy. For each set of assumptions, we use theoretical nucleosynthesis models to calculate the expected total metal yield per mass of star formation, and to predict the relative abundances of different elements. Including pair-instability supernovae from very massive stars will dramatically increase the amount of metal produced, and, combined with a slightly flatter IMF, can lead to 3 times the metal production per solar mass of star formation.
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