Contributed Talk - Splinter Stars

Thursday, 16 September 2021, 10:00   (virtual Stars)

Stellar feedback as source of gas dissolution in GMCs : 1D hydrodynamic models

Michalis Kourniotis, Richard Wünsch, Jan Palouš, Sonia Ehlerová
Astronomical Institute of Czech Academy of Sciences

Star clusters form within molecular gas regions of high density, which are formed either upon the collapse of cold gas clouds or due to turbulent forces acting on the gas. In the current study we focus on star formation that takes place in the center of a spherically symmetric molecular gas cloud, which collapses under its own gravity. We investigate the conditions when the stellar feedback can slow down the collapse or even disrupt the cloud, potentially explaining the observed star formation efficiency in GMCs by means of self disruption of the cloud. When the gravitational force is dominant, secondary star-forming, continuous or monolithic, events are expected to occur. We built an one-dimensional model that is based on the hydrodynamic code FLASH and implements the fundamental physics of the feedback: ram pressure from the stellar winds, radiation pressure on dust and gas, and photoionization. We evaluate our model against the semi-analytical model of Rahner et al. (2017) for the star cluster feedback, and accordingly discuss the probability that the compact cluster R136 in the Large Magellanic Cloud was formed due to feedback processes between NGC2070 and the massive cloud host. Our up to now results show that the feedback from star clusters that are formed self-consistently within clouds with mass log(M/Mo)=4, can efficiently induce the cloud disruption. Clouds with mass exceeding log(M/Mo)=5 can be disrupted by the feedback from clusters with mass a few hundredths to even tenths the mass of the cloud. The case of gas density following a power law is being discussed.