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View Full Version : Star formation rates...smooth or episodic?



trinitree88
2011-Nov-08, 02:43 PM
The authors find that star formation rates in galaxies at Z= ~ 3.0 may be more episodic than previously thought. SEE:http://arxiv.org/abs/1111.1233

George
2011-Nov-08, 03:21 PM
Is there any galactic star formation analog to the bombardment period for our Solar system? In other words, is there an epic where galaxies collided more often?

antoniseb
2011-Nov-08, 03:55 PM
That's consistent with new and better observations allowing us to impose more detail on our models. It's good to see new work improving our understanding. We used to assume slow consistent star formation... even though we now see huge star forming going on in mergers, and from infalling pristine clouds. George has probably nailed it.

Cougar
2011-Nov-10, 02:16 PM
In other words, is there an epic where galaxies collided more often?

Epoch. I would think the probability of galaxy collisions would increase with z, since the distance between galaxies decreases with z.

George
2011-Nov-11, 09:42 PM
Epoch. I would think the probability of galaxy collisions would increase with z, since the distance between galaxies decreases with z.Thanks, epoch. I seek the epic epoch, then. :) [How's that for an out?]

loglo
2011-Nov-12, 09:07 AM
Thanks, epoch. I seek the epic epoch, then. :) [How's that for an out?]

This is still work in progress. See:-
http://www.universetoday.com/90447/determining-the-galaxy-collision-rate/
Preprint (http://arxiv.org/abs/1108.2508)

George
2011-Nov-13, 06:09 PM
This is still work in progress. See:-
http://www.universetoday.com/90447/determining-the-galaxy-collision-rate/
Preprint (http://arxiv.org/abs/1108.2508) Yes, apparently so. Nice and timely link.