24-28 October 2022
La Thanh Hotel, Hanoi, Vietnam
Asia/Ho_Chi_Minh timezone
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The impact of star-formation driven outflows in chemical evolution models and circumgalactic enrichment of galaxies

Speaker

Dr Michael Romano (National Center for Nuclear Research, Warsaw, Poland)

Description

Galactic feedback driven by massive stars and active galactic nuclei (AGNs) plays a fundamental role in regulating galaxy formation and evolution. In particular, intense starburst episodes could generate strong outflows able to suppress star formation (SF) by expelling large amount of dust and metals out of the galaxies, possibly enriching their circum (or even inter) galactic media. Galactic outflows are ubiquitous in high-redshift star-forming galaxies (SFGs) and quasars. However, local dwarf galaxies are particularly sensitive to feedback processes and offer a unique opportunity to study these phenomena in great details. State-of-the-art chemical evolution models predict very efficient outflows in such galaxies in order to reproduce their observational properties. To test these expectations, we searched for outflow signatures in a sample of ~30 local dwarf SFGs drawn from the Dwarf Galaxy Survey. We made use of Herschel/PACS archival data to detect atomic outflows in the broad wings of observed [CII] 158 $\mu m$ line profiles. We found that SF-driven outflows are less efficient than those induced by local AGNs, with typical mass-loading factors (i.e., the ratio between the outflow rate and the star-formation rate) slightly greater than unity. However, these findings could be underestimated by a factor ~3 if accounting for the other phases of the interstellar medium (i.e., molecular and ionized gas). Our results could be used as input for chemical models, posing new constraints on the processes of dust growth and destruction in the interstellar medium of galaxies.

Please select a main topic related to your abstract First Generation Stars and Galactic Chemical Evolution

Primary author

Dr Michael Romano (National Center for Nuclear Research, Warsaw, Poland)

Presentation Materials