Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-27
Mon.Not.Roy.Astron.Soc. 349 (2004) L19
Astronomy and Astrophysics
Astrophysics
to appear in MNRAS Letters
Scientific paper
10.1111/j.1365-2966.2004.07689.x
We present results from Tree+SPH simulations of a galaxy cluster, aimed at studying the metal enrichment of the intra--cluster medium (ICM). The simulation code includes a fairly advanced treatment of star formation, as well as the release of energy feedback and detailed yields from both type-II and type-Ia supernovae, also accurately accounting for the lifetimes of different stellar populations. We perform simulations of a cluster with virial mass ~ 3.9x 10^14 Msun, to investigate the effect of varying the feedback strength and the stellar initial mass function (IMF). Although most of the models are able to produce acceptable amounts of Fe mass, we find that the profiles of the iron abundance are always steeper than observed. The [O/Fe] ratio is found to be sub--solar for a Salpeter IMF, with [O/Fe] -0.2 at R >~ 0.1R200, whereas increasing to super-solar values in central regions, as a result of recent star formation. Using a top--heavier IMF gives a larger [O/Fe] over the whole cluster, at variance with observations. On the other hand, the adoption of a variable IMF, which becomes top-heavier at z>2, provides a roughly solar [O/Fe] ratio. Our results indicate that our simulations still lack a feedback mechanism which should quench star formation at low redshift and transport metals away from the star forming regions.
Borgani Stefano
Matteucci Francesca
Recchi Simone
Tornatore Luca
Tozzi Paolo
No associations
LandOfFree
Simulating the metal enrichment of the ICM 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 Simulating the metal enrichment of the ICM, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulating the metal enrichment of the ICM will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-646776