Delta på disputasen
PhD disputasen og prøveforelesningen vil foregå 100% fysisk. Rommet åpnes for deltakelse like før disputasen starter, og stenger for nye deltakere omtrent 15 minutter etter at disputasen har startet.
Delta på prøveforelesning - 25. oktober kl. 10:15 (Aud. 209, Svein Rosselands Hus)
"Stellar tracks in the HR diagram: from the Hayashi track to giant and white dwarf phases"
Kreeringssammendrag
Denne doktorgradsforskningen undersøker det circum-galaktiske mediet rundt galakser, som er avgjørende for å forstå galakseutvikling, men vanskelig å observere. Ved hjelp av simuleringer og modellering ble falske observasjoner utviklet for det kommende Atacama Large Aperture Submillimeter Telescope (AtLAST). Dette vil oppdage svake signaler fra det tidlige universet, som er utilgjengelige for nåværende astronomiske fasiliteter.
Hovedfunn:
My PhD thesis investigates the gas halo around galaxies, known as the circum-galactic medium (CGM), crucial for understanding galaxy evolution but challenging to observe due to its faint, diffuse and extended nature. I utilized cutting-edge simulations to probe this gas across cosmic time and created mock observations for the upcoming Atacama Large Aperture Submillimeter Telescope (AtLAST).
Starting with the early Universe, my findings indicate that AtLAST could detect faint emission lines from the CGM that are currently beyond the reach of telescopes like ALMA. I also explored how sub-millimetre emission line ratios can reveal physical properties of the gas in distant galaxies. Additionally, I mentored a Master's student to enhance our models considering early galaxies' chemical variances, yielding more accurate predictions.
Lastly, I modelled the thermal Sunyaev-Zel'dovich effect in the CGM, which reflects internal halo pressures linked to galaxy evolution. I discovered AtLAST could detect this effect in individual galaxy groups, unlike current facillities which can only achieve this via stacking of hundreds of thousand observations.
My work demonstrates AtLAST's potential to significantly advance our understanding of galaxy evolution from the early Universe to the present day. My work demonstrates AtLAST's potential to significantly advance our understanding of galaxy evolution from the early Universe to the present day.
