September 15, 2022 @ 14:00 – 15:00 Europe/Copenhagen Timezone
Meghana Killi: PhD status seminar – Morphology and Spectroscopy of High-redshift Galaxies
I will give an overview of my research over the last two years and a brief outline of my plans for the last year of my PhD program. I have 3 ongoing projects: The first is a gas-phase metallicity measurement using far infrared emission lines from a normal galaxy in the reionisation epoch at z~7. The second is a statistical study of spatial offsets between stars and the interstellar medium in main-sequence star-forming galaxies at z~4-6. The third is an analysis of a sample of bright, compact Lyman alpha emitters found in archival Hubble data also around z~4-6. I will explain the motivation behind each work, highlight the most important results (so far), and attempt to place the findings in larger astrophysical context.

Antonello Calabrò: ISM kinematics and outflows in star-forming galaxies at z ~ 3
Gaseous flows inside and outside galaxies are key to understanding galaxy evolution, as they regulate their star-formation activity and chemical enrichment across cosmic time. In this talk, I will present a study on the ISM kinematics of a sample of ~ 300 CIII] and HeII emitters at redshift 2 < z < 5 selected from the VANDELS survey and representative of the star-forming Main Sequence in the stellar mass range 9<log(M*/Msun)<11. Outflow and inflow velocities, which are derived as the velocity shift of low and high-ionization far-UV absorption lines (i.e., SiII, CII, AlIII, SiIV, AlIII) from the systemic redshift, are then compared to other galaxy properties in order to investigate their physical drivers. I will also derive the mass outflow rate, and finally explore the fate of the outflows by comparing their velocities to the typical escape velocity estimated from a subset of our sample with MOSFIRE follow-up.