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Constraints on galaxy formation from alpha-enhancement in luminous elliptical galaxies | | D. Thomas
; L. Greggio
; R. Bender
; | | Date: |
21 Sep 1998 | | Subject: | astro-ph | | Affiliation: | 1,2), and R. Bender ( Universitaets-Sternwarte Muenchen, Universita di Bologna | | Abstract: | We explore the formation of alpha-enhanced and metal-rich stellar populations in the nuclei of luminous ellipticals under the assumption of two extreme galaxy formation scenarios based on hierarchical clustering, namely a fast clumpy collapse and the merger of two spirals. We investigate the parameter space of star formation time-scale, IMF slope, and stellar yields. In particular, the latter add a huge uncertainty in constraining time-scales and IMF slopes. We find that -- for Thielemann, Nomoto & Hashimoto nucleosynthesis -- in a fast clumpy collapse scenario an [alpha/Fe] overabundance of approx. 0.2 dex in the high metallicity stars can be achieved with a Salpeter IMF and star formation time-scales of the order 10^9 yr. The scenario of two merging spirals which are similar to our Galaxy, instead, fails to reproduce alpha-enhanced abundance ratios in the metal-rich stars, unless the IMF is flattened during the burst ignited by the merger. This result is independent of the burst time-scale. We suggest that abundance gradients give hints to distinguish between the two extreme formation scenarios considered in this paper. | | Source: | arXiv, astro-ph/9809261 | | Services: | Forum | Review | PDF | Favorites | |
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