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Doctoral thesis
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English

Metallic UV absorption lines as diagnostics of the escape of ionising photons from simulated galaxies

Imprimatur date2021-12-28
Defense date2021-11-16
Abstract

Reionisation was the period during which the first galaxies emitted enough hydrogen-ionising photons to ionise the intergalactic medium (IGM). To deduce the contribution of a galaxy to the emission of ionising photons, one must know its escape fraction of ionising photons: which fraction reach the IGM before being absorbed by the gas inside the galaxy? My goal in this thesis was to explore ways of deducing the escape fraction of high-redshift galaxies, relying on indirect methods since the ionising photons are not observable. I focused my efforts on one method using metallic absorption lines, believed to be linked with the coverage of neutral gas in front of stars, thus related to the escape fraction. I post-processed RAMSES-RT simulations to produce mock absorption lines and compute escape fractions from simulated galaxies. Comparing the lines and the escape fractions, I showed that the former are not faithful tracers of the latter.

eng
Keywords
  • Reionisation, galaxies, simulations, absorption lines, escape fractions, dust attenuation
Citation (ISO format)
MAUERHOFER, Valentin. Metallic UV absorption lines as diagnostics of the escape of ionising photons from simulated galaxies. 2021. doi: 10.13097/archive-ouverte/unige:158811
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Creation02/08/2022 3:55:00 PM
First validation02/08/2022 3:55:00 PM
Update time03/12/2024 3:19:47 PM
Status update03/12/2024 3:19:47 PM
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