Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-22
Phil.Trans.Roy.Soc.Lond. A363 (2005) 715-724
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures, published in Philosophical Transactions A (Royal Society)
Scientific paper
10.1098/rsta.2004.1515
There are (at least) two unsolved problems concerning the current state of the thermal gas in clusters of galaxies. The first is identifying the source of the heating which offsets cooling in the centers of clusters with short cooling times (the ``cooling flow'' problem). The second is understanding the mechanism which boosts the entropy in cluster and group gas. Since both of these problems involve an unknown source of heating it is tempting to identify them with the same process, particular since AGN heating is observed to be operating at some level in a sample of well-observed ``cooling flow'' clusters. Here we show, using numerical simulations of cluster formation, that much of the gas ending up in clusters cools at high redshift and so the heating is also needed at high-redshift, well before the cluster forms. This indicates that the same process operating to solve the cooling flow problem may not also resolve the cluster entropy problem.
Bryan Greg L.
Voit Gerard Mark
No associations
LandOfFree
Cooling and Clusters: When Is Heating Needed? 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 Cooling and Clusters: When Is Heating Needed?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cooling and Clusters: When Is Heating Needed? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-471334