The roles of stellar feedback and galactic environment in star-forming molecular clouds
| Autor: | C. Alig, Ramon Rey-Raposo, Oscar Agertz, Clare Dobbs |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Gravitation 0103 physical sciences Gravitational collapse Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Turbulence Star formation Molecular cloud Astronomy Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Supernova Stars 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 464:3536-3551 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stw2607 |
| Popis: | Feedback from massive stars is thought to play an important role in the evolution of molecular clouds. In this work we analyse the effects of stellar winds and supernovae (SNe) in the evolution of two massive ($\sim 10^6\,M_\odot$) giant molecular clouds (GMCs): one gravitationally bound collapsing cloud and one unbound cloud undergoing disruption by galactic shear. These two clouds have been extracted from a large scale galaxy model and are re-simulated at a spatial resolution of $\sim 0.01$ pc, including feedback from winds, SNe, and the combined effect of both. We find that stellar winds stop accretion of gas onto sink particles, and can also trigger star formation in the shells formed by the winds, although the overall effect is to reduce the global star formation rate of both clouds. Furthermore, we observe that winds tend to escape through the corridors of diffuse gas. The effect of SNe is not so prominent and the star formation rate is similar to models neglecting stellar feedback. We find that most of the energy injected by the SNe is radiated away, but overdense areas are created by multiple and concurrent SN events especially in the most virialised cloud. Our results suggest that the impact of stellar feedback is sensitive to the morphology of star forming clouds, which is set by large scale galactic flows, being of greater importance in clouds undergoing gravitational collapse. Comment: 17 pages, 16 figures |
| Databáze: | OpenAIRE |
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