Simulating galaxy clusters -- I. Thermal and chemical properties of the intra-cluster medium

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

23 pages, 20 colour figures; final version accepted

Scientific paper

10.1111/j.1365-2966.2006.10735.x

We have performed a series of N-body/hydrodynamical (TreeSPH) simulations of clusters and groups of galaxies, selected from cosmological N-body simulations within a $\Lambda$CDM framework: these objects have been re-simulated at higher resolution to $z$=0, in order to follow also the dynamical, thermal and chemical input on to the ICM from stellar populations within galaxies. The simulations include metal dependent radiative cooling, star formation according to different IMFs, energy feedback as strong starburst-driven galactic super-winds, chemical evolution with non-instantaneous recycling of gas and heavy elements, effects of a meta-galactic UV field and thermal conduction in the ICM. In this Paper I of a series of three, we derive results, mainly at $z=0$, on the temperature and entropy profiles of the ICM, its X-ray luminosity, the cluster cold components (cold fraction as well as mass--to--light ratio) and the metal distribution between ICM and stars. In general, models with efficient super-winds, along with a top-heavy stellar IMF, are able to reproduce fairly well the observed $L_X-T$ relation, the entropy profiles and the cold fraction. Observed radial ICM temperature profiles can be matched, except for the gradual decline in temperature inside of $r\sim$~0.1$R_{\rm{vir}}$. Metal enrichment of the ICM gives rise to somewhat steep inner iron gradients; yet, the global level of enrichment compares well to observational estimates after correcting for the stars formed at late times at the base of the cooling flows; also the metal partition between stars and ICM gets into good agreement with observations.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Simulating galaxy clusters -- I. Thermal and chemical properties of the intra-cluster medium 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 galaxy clusters -- I. Thermal and chemical properties of the intra-cluster medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulating galaxy clusters -- I. Thermal and chemical properties of the intra-cluster medium will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-553752

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.