CLUSTERS OF GALAXIES Cluster Mergers and Cold Fronts.

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Presentation transcript:

CLUSTERS OF GALAXIES Cluster Mergers and Cold Fronts

Show 2dF Movie

Structure Formation

Cluster Formation

Gas Dark Matter X-ray Temp

We discuss some of the physical processes that occurs during cluster merger

V

Cluster Mergers

Cluster Merger Density Entropy

1E0657 Markevitch et al 2001.

1E0657

Cold Fronts In Merger Clusters

CHANDRA OBSERVATION OF A2142 M. Markevitch et al. 2000, ApJ, 541, 542

CHANDRA OBSERVATION OF A3667 A. Vikhlinin, M. Markevitch, S. S. Murray 2000, ApJ, 551, 160

The most natural explanation is that A3667 hosts a moving dense, cold gas cloud Interpretation for the Cold Front The ratio between the pressure in region 0 and 1 gives the cloud speed The cold front is the contact surface The external gas slows down at leading edge but reaccelerates as it is squeezed to the sides

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