A Chemical Evolution Model for the Fornax Dwarf Spheroidal Galaxy

Zhen Yuan, Yong Zhong Qian, Yi Peng Jing

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Fornax is the brightest Milky Way (MW) dwarf spheroidal galaxy and its star formation history (SFH) has been derived from observations. We estimate the time evolution of its gas mass and net inflow and outflow rates from the SFH usinga simple star formation law that relates the star formation rate to the gas mass. We present a chemical evolution model on a 2D mass grid with supernovae (SNe) as sources of metal enrichment. We find that a key parameter controlling the enrichment is the mass Mx of the gas to mix with the ejecta from each SN. The choice of Mx depends on the evolution of SN remnants and on the global gas dynamics. It differs between the two types of SNe involved and between the periods before and after Fornax became an MW satellite at time t = tsat. Our results indicate that due to the global gas outflow at t > tsat, part of the ejecta from each SN may directly escape from Fornax. Sample results from our model are presented and compared with data.

Original languageEnglish (US)
Article number02002
JournalEPJ Web of Conferences
StatePublished - Feb 12 2016
Event13th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2015 - Beijing, China
Duration: Jun 24 2015Jun 27 2015

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© 2016 Owned by the authors, published by EDP Sciences.


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