Contributed Talk - Splinter Stars

Wednesday, 15 September 2021, 09:40   (virtual Stars)

The impact of expanding CII bubbles on the interstellar medium

Nicola Schneider and FEEDBACK consortium
I. Physik. Institut, University of Cologne

I will present first results of the SOFIA (Stratospheric Observatory for Infrared Astronomy) legacy program FEEDBACK. The project has been granted 96 hours observing time and started in 2019 in order to map Galactic star-forming regions in the emission lines of ionized carbon [CII] at 158μm and oxygen [OI] at 63μm. One major results is that we discovered in all FEEDBACK sources studied so far (RCW120, RCW36, RCW49, NGC7538, W40) expanding bubbles seen in the [CII] line, supporting an earlier finding in Orion A. We derived that these bubbles are driven by stellar winds that can trigger further star formation on short time scales. This is in contradiction to most of the simulations where the impact of stellar wind was considered as less important compared to radiation. I will outline how we calculate the various energy contributions and invite the interested community to comment on our approach in order to solve the discrepancy with models.