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The metal enrichment of elliptical galaxies in hierarchical galaxy formation models.

Nagashima, M. and Lacey, C.G. and Okamoto, T. and Baugh, C.M. and Frenk, C.S. and Cole, S. (2005) 'The metal enrichment of elliptical galaxies in hierarchical galaxy formation models.', Monthly notices of the Royal Astronomical Society: letters., 363 (1). L31-L35.

Abstract

We investigate the metal enrichment of elliptical galaxies in the framework of hierarchical models of galaxy formation. The semi-analytical model we use, which has been used to study the metal enrichment of the intracluster medium (ICM) by Nagashima et al., includes the effects of flows of gas and metals both into and out of galaxies and the processes of metal enrichment due to both type Ia and type II supernovae. We adopt a solar neighbourhood initial mass function (IMF) for star formation in discs, but consider models in which starbursts have either a solar neighbourhood IMF or a top-heavy IMF. We find that the α-element abundance in ellipticals is consistent with observed values only if the top-heavy IMF is used. This result is consistent with our previous study on the metal enrichment of the ICM. We also discuss the abundance ratio of α elements to iron as a function of velocity dispersion and metallicity. We find that models with a top-heavy IMF match the α/Fe ratios observed in typical L* ellipticals, but none of the models reproduces the observed increase of α/Fe with velocity dispersion.

Item Type:Article
Keywords:Stars: luminosity function, mass function, Galaxies: clusters: general, Galaxies: formation, Large-scale structure of Universe.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/j.1745-3933.2005.00078.x
Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2005 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:20 February 2015
Date of first online publication:October 2005
Date first made open access:No date available

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