Cosmological implications of dwarf spheroidal chemical evolution

Details Cosmological implications of dwarf spheroidal chemical evolution Cosmological implications of dwarf spheroidal chemical evolution

2006-02-22

arxiv.org/abs/astro-ph/0602489v2

Astrophys.J. 646 (2006) 184-191

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures. Accepted for publication in ApJ. Minor changes following referee report

Scientific paper

10.1086/504893

The chemical properties of dwarf spheroidals in the local group are shown to be inconsistent with star formation being truncated after the reionization epoch (z~8). Enhanced levels of [Ba/Y] in stars in dwarf spheroidals like Sculptor indicate strong s-process production from low-mass stars whose lifetimes are comparable with the duration of the pre-reionization epoch. The chemical evolution of Sculptor is followed using a model with SNeII and SNeIa feedback and mass- and metallicity-dependent nucleosynthetic yields for elements from H to Pb. We are unable to reproduce the Ba/Y ratio unless stars formed over an interval long enough for the low-mass stars to pollute the interstellar medium with s-elements. This robust result challenges the suggestion that most of the local group dwarf spheroidals are fossils of reionization and supports the case for large initial dark matter halos.

Affiliated with

Also associated with

No associations

Rating

Cosmological implications of dwarf spheroidal chemical evolution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cosmological implications of dwarf spheroidal chemical evolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological implications of dwarf spheroidal chemical evolution will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-88606