Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..845c&link_type=abstract
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. 845, 1994
Astronomy and Astrophysics
Astrophysics
4
Galaxies: Evolution Of - Stars: Formation Of
Scientific paper
A model with stimulation and inhibition of star formation (SF) by interstellar UV-radiation (A> 912 A) and X-rays is considered. Both UV and X-rays have large free path in the intercloud medium (lUV = (σn0)-1 ≥ 300 pc) and are able to synchronize star formation on large scales. The main suggestion is that UV radiation generated by newly born massive stars induces a contraction of optically thick interstellar clouds and it results in formation of stars of the next generation. This positive feedback ensures the growth of star formation rate on spatial scales of the order of lUV in a time scale close to the time of pre-mainsequence evolution of massive stars (≤ 3 Myr) so that star formation process propagates through the system with a velocity of ˜100 km s-1. Such a process will be observed as a global quasy-synchronous starburst.
On the other hand X-ray photons, for which interstellar clouds are optically thin, can depress star formation by heating the cloud gas. Thus, there is a negative feedback with long-range action - X-ray emission produced by massive stars of previous generation exploding as SNe. The competition between positive and negative feedbacks produces the onset of an oscillatory global SF regime.
Cammerer M.
Shchekinov Yuri
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