Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-24
Astronomy and Astrophysics
Astrophysics
10 pages, 1 figure (figures.png), invited talk at IAU 195
Scientific paper
Recent rotation measure observations of a dozen or so galaxy clusters have revealed a surprisingly large amount of magnetic fields, whose estimated energy and flux are, on average, $\sim 10^{58}$ ergs and $\sim 10^{41}$ G cm$^2$, respectively. These quantities are so much larger than any coherent sums of individual galaxies within the cluster that an efficient galactic dynamo is required. We associate these fields with single AGNs within the cluster and therefore with all galaxies during their AGN phase. Only the central, massive black hole (BH) has the necessary binding energy, $\sim 10^{61}$ ergs. Only the accretion disk during the BH formation has the winding number, $\sim 10^{11}$ turns, necessary to make the gain and magnetic flux. We present a model of the BH accretion disk dynamo that might create these magnetic fields, where the helicity of the $\alpha - \Omega$ dynamo is driven by star-disk collisions. The back reaction of the saturated dynamo forms a force-free field helix that carries the energy and flux of the dynamo and redistributes them within the clusters.
Colgate Stirling A.
Li Hui
No associations
LandOfFree
The Magnetic Fields of the Universe and Their Origin 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 Magnetic Fields of the Universe and Their Origin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Magnetic Fields of the Universe and Their Origin will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-308411