| Description |
The talk of Dr. Omima Osman (Trieste Observatory of the Italian National Institute for Astrophysics, Italy) will follow the lecture of Dr. Hassan Abdallah (The Universidad Complutense de Madrid, Spain) given on June 30th 2025. The abstract of Dr. Osman's talk: For decades, dust has been recognized as an active component of galaxies, significantly modifying the physical conditions of their interstellar medium (ISM). Hence vigorously influencing their evolution. For instance, dust catalyzes the formation of molecular hydrogen, enhancing the efficiency of star formation. Dust-related processes such as photoelectric heating and grain collections with the gas phase species lead to heating and cooling of the ISM, respectively. Dust also locks metals out of the gas phase, altering galaxies; chemical enrichment history. Besides all, dust also significantly alters galaxies’ spectral energy distribution. Therefore, modelling dust physics to reproduce the observed dust abundances is quite challenging, particularly at high redshift where galaxies have, surprisingly, large amounts of dust for their age (e.g. A- 1689-zD1 at z ~ 7.5). Motivated by these challenges and the insights offered by ALMA and JWST, we include a treatment for dust formation, growth, and destruction in the state-of-the-art GAlaxy Evolution and Assembly (GAEA) model. We have extensively studied different variants of the model and compared our results with those of previously published models and observational data from redshift ~ 0 to 5.5. Furthermore, we use our model to analyse the onset of dust and metal production in the early Universe and compare it with the most recent measurements from JWST. |
PWF Sudan: Expanding Physics Horizons in Sudan: Leveraging Online Seminars for Growth - Omima Osman: Dust evolution across cosmic times as seen through DUSTY-GAEA
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