Gravity or turbulence? Energy budget of molecular clouds (Javier Ballesteros-Paredes , UNAM/IRyA) скачать в хорошем качестве

Gravity or turbulence? Energy budget of molecular clouds (Javier Ballesteros-Paredes , UNAM/IRyA)

In this talk I will discuss the pros and cons of the collapse and the turbulent model of molecular cloud dynamics and star formation, and what exactly the molecular clouds’ energy budget tells us; whether gravitational forces dominate over other sources of momentum, and what are the implications of the energy budget on the efficiency and rate of star formation. I will also show that the low values and the constancy of the “efficiency per free-fall time” arise naturally when clouds collapse. Our results imply that stellar feedback is the crucial ingredient to halt star formation, keeping the gas depletion time low on galactic levels. I will also show that the kinematic properties of young stars observed with Gaia are consistent with them being born from collapsing clouds rather than clouds supported by turbulence.