Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-28
Astronomy and Astrophysics
Astrophysics
24 pages, 9 figures, and 1 table. Accepted by ApJ. Full res figures and paper at http://www.physics.rutgers.edu/~percy/cf.ps
Scientific paper
We report the results of recent numerical simulations of the head-on merger of a cooling flow cluster with an infalling subcluster of galaxies. These simulations examined the effects of different types of cluster mergers (with 16:1 and 4:1 mass ratios) on the evolution of cluster cooling flows (mass accretion rates of 100 and 400 M/year. The 2-dimensional simulations were performed with a Hydro/N-body code on a uniform grid with a resolution of 20 kpc. We find that the ram-pressure of the infalling gas is crucial in determining the fate of the cooling flow as disruption occurs when a substantial amount of subcluster gas reaches the primary's core. In such cases, the subcluster gas can increase the central cooling time by displacing the high-density cooling gas and by heating it via shocks and turbulent gas motions. Moreover, the fate of a merging cooling flow is also dependent on its initial cooling time. In cases where the initial cooling time is very small then, even if the flow is disrupted, the central cooling time will remain less than a Hubble time and the flow will likely re-establish itself. This has an important observational consequence because such clusters will be classified as cooling flows even though they have experienced a significant merger. In addition, there is a time delay (1-2 Gyrs) between core-crossing and the point at which the central cooling time of a disrupted flow becomes of order a Hubble time (abridged).
Burns O. Jr. J.
Gomez Percy L.
Loken Chris
Roettiger Kurt
No associations
LandOfFree
Do Cluster Cooling Flows Survive Head-on Galaxy Cluster Mergers? 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 Do Cluster Cooling Flows Survive Head-on Galaxy Cluster Mergers?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Do Cluster Cooling Flows Survive Head-on Galaxy Cluster Mergers? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-651148