logo SBA

ETD

Archivio digitale delle tesi discusse presso l’Università di Pisa

Tesi etd-03142022-122523


Tipo di tesi
Tesi di laurea magistrale
Autore
PARLANTI, ELEONORA
URN
etd-03142022-122523
Titolo
Galaxy evolution in the first Gyrs of the Universe: investigating gas kinematic properties with ALMA
Dipartimento
FISICA
Corso di studi
FISICA
Relatori
relatore Prof. Cignoni, Michele
relatore Prof. Carniani, Stefano
Parole chiave
  • Alma
  • galaxy
  • gas kinematic
  • high-redshift
Data inizio appello
04/04/2022
Consultabilità
Non consultabile
Data di rilascio
04/04/2025
Riassunto
The aim of this thesis was to determine if galaxies in the first Gyrs of the Universe are
dynamically more chaotic than their local counterparts or not. Therefore, I investigated the
kinematical properties of a sample of high-redshift (z ∼5 −7) star-forming galaxies by using
observations of rest-frame far-infrared lines carried out with the telescope Atacama Large Millimeter/sub–Millimeter Array (ALMA). I performed a kinematical analysis by selecting a sample of 20 targets that is 2 times larger than the current sample in literature.
Based on the kinematics analysis of the selected galaxies studied through the [C II]
and [O III] emission lines, I found evidence for rotating disks already 1 Gyr after the Big
Bang. These disks have a gas velocity dispersion that is 5 times larger than
what is observed in the local Universe. This indicates that high-redshift galaxies are more
chaotic than local ones, as also predicted by recent galaxy evolution models and cosmological simulations.
File