Wednesday, August 16, 2006

C. Martin on "Starburst Feedback"

With "feedback" all kinds of energy input is meant. Feedback mainly comes from supernovae and from active galactic nuclei (AGN), that can significantly dirsturb the interstellar medium of a galaxy and produce outflows.

Again, we talk about ULIRGS and the ones which have the U for "ultra-luminous" are indeed all mergers. Blue-shifted absorption lines show that these outflows really exist and move at several hundred km/s. Very interesting is one example where they find the wind over the whole galaxy, but it still rotates, which it should not. She explains this by the wind being driven by the whole disk, but I do not see how that should work right now.

These global winds can be driven both by a starburst and AGN, but the actual mass in the wind is weakly constrained. In addition, she claims that there is little evidence that AGN can provide enough energy to shut down star formation by removing the gas, a mechanism that is becoming more and more popular.

1 Comments:

At 3:39 PM, Anonymous AmHelio said...

What is the rotation center of the wind? It would have to rotate around the galactic center, right? How could it rotate around the emitting star.

 

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