Mathematics – Logic
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3417p&link_type=abstract
American Astronomical Society, HEAD meeting #11, #34.17; Bulletin of the American Astronomical Society, Vol. 41, p.713
Mathematics
Logic
Scientific paper
We examine the long-standing cooling flow problem in galaxy clusters with 3D MHD simulations including radiative cooling and anistropic thermal conduction along magnetic field lines. The central regions of the intracluster medium (ICM) can have cooling times as short as 100 Myr. In order to prevent a cooling catastrophe, the ICM must be heated by some mechanism, such as AGN feedback or thermal conduction from the thermal reservoir at large radii. The cores of galaxy clusters are unstable to the heat-flux-driven buoyancy instability (HBI), a convective instability. We find that the HBI rearranges the magnetic field lines to be preferentially perpendicular to the temperature gradient, suppressing the effective radial thermal conductivity to less than 10% of the Spitzer value. For cool core, low central entropy clusters, we find that thermal conduction alone cannot prevent a cooling catastrophe. For non cool core, high central entropy clusters, we find that thermal conduction can provide sufficient heating for cosmologically interesting timescales. We also examine the role of turbulence from galaxy wakes and AGN and find that in certain cases turbulence can stabilize the cooling instability and the HBI in cluster cores. We report on this surprising finding and discuss possible explanations.
Parrish Ian J.
Quataert Eliot
No associations
LandOfFree
The Role of Conduction and Turbulence in the Cooling Flow Problem in Galaxy Clusters. 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 The Role of Conduction and Turbulence in the Cooling Flow Problem in Galaxy Clusters., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Role of Conduction and Turbulence in the Cooling Flow Problem in Galaxy Clusters. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1094155