Simulating the metal enrichment of the intracluster medium

Autor(en)
Luca Tornatore, Stefano Borgani, Francesca Matteucci, Simone Recchi, Paolo Tozzi
Abstrakt

We present results from Tree + SPH simulations of a galaxy cluster, aimed at studying the metal enrichment of the intracluster 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 la supernovae, also accurately accounting for the lifetimes of different stellar populations. We perform simulations of a cluster with virial mass ?3.9 × 1014 M?, 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 subsolar for a Salpeter IMF, with [O/Fe] ? -0.2 at R > 0.1R200, whereas increasing to supersolar 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.

Organisation(en)
Institut für Astrophysik
Externe Organisation(en)
Scuola Internazionale Superiore di Studi Avanzati, Università degli Studi di Trieste, INAF Astronomical Observatory of Triest
Journal
Monthly Notices of the Royal Astronomical Society
Band
349
ISSN
0035-8711
Publikationsdatum
2004
Peer-reviewed
Ja
ÖFOS 2012
103003 Astronomie
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/4ce2c697-05c3-4c35-b2a1-e4e1236c820e