Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-15
Astrophys.J. 587 (2003) 580-588
Astronomy and Astrophysics
Astrophysics
8 pages (emulateapj5) with 4 figures; accepted by The Astrophysical Journal
Scientific paper
10.1086/368307
Cluster cooling flow models that include both thermal conduction and AGN heating have lower overall mass cooling rates and simultaneously sustain density and temperature profiles similar to those observed with no ad hoc mass dropout. To achieve this agreement, the thermal conductivity must be about 0.35 +/- 0.10 of the Spitzer value, similar to that advocated by Narayan & Medvedev. However, when applied to galaxy/group scales the synergistic combination of AGN heating and conduction is less satisfactory. When the computed density profile and the global cooling rate are lowered by AGN heating to match observations of these smaller scale flows, the gas temperatures within about 10 kpc are too large. In addition, best-fitting flows in galaxy/groups with AGN heating and thermal conduction require larger conductivities, about 0.5 - 1.0 of the Spitzer value. When the gas density in galaxy/group flows is lowered by heating, the iron enrichment by Type Ia supernovae is more effective and the hot gas iron abundance greatly exceeds observed values. Consequently, galactic/group flows with central heating and conduction require an additional process that removes the iron: failure of Type Ia ejecta to go into the hot phase, selective cooling, etc.
Brighenti Fabrizio
Mathews William G.
No associations
LandOfFree
Feedback Heating in Cluster and Galactic Cooling Flows 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 Feedback Heating in Cluster and Galactic Cooling Flows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feedback Heating in Cluster and Galactic Cooling Flows will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-497345