GEHRs

Re: GEHRs

by David Cohen -
Number of replies: 0

The "E" stands for "extragalactic" (outside our own galaxy) and Carina is in the Milky Way. But more materially, I think that (wonder if?) Carina isn't big enough to constitute a Giant (E)HR. The cluster 30 Doradus that's mentioned a couple of places in the proposal is probably a GEHR - it's the biggest star formation region in the Local Group (of galaxies). 30 Dor is in the Magellanic Clouds. And Leisa Townsley (and I) wrote another proposal, just two years ago, to make similar observations of it with Chandra. The proposal was approved last year and the observations will be made soon!

Massive stars can halt star formation nearby by heating up gas (which makes it harder to gravitationally collapse; you could look at the formula for the Jeans mass). And also by driving away gas with both radiation and winds (and also supernova explosions).