Universiteit Leiden

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Promotie

Radio galaxies near the epoch of reionisation

Datum
woensdag 26 juni 2019
Tijd
Locatie
Academiegebouw
Rapenburg 73
2311 GJ Leiden

Samenvatting

This thesis explores the theoretical and observational properties of distant massive galaxies that harbour an active black hole in their centres and shine brightly at radio wavelengths. These radio galaxies are some of the rarest objects in the Universe, and studying them reveals more about the formation and evolution of massive galaxies and black holes in the Universe. In Chapter 2, we model faint radio galaxies at record distances (high redshifts). We construct a simple model to characterise the overall evolution of radio galaxies, and find that our model replicates well the properties of radio galaxies that are nearer to us. This gives us confidence in the model predictions at higher redshifts (larger distances), where data is scarce. In Chapter 3, building on the model, we compile a list of promising distant, faint radio galaxies using all-sky radio datasets. Since radio galaxies are rare, a large area of the sky is needed to increase chances of finding one at record distances. We present observations for these candidates at a high resolution. In Chapter 4, we report the discovery of the most distant radio galaxy observed till date, TGSS J1530+1049. The galaxy’s distance is confirmed using data from various telescopes, and its physical properties are different from other known radio galaxies. In Chapter 5, we present a detailed study of other distant radio galaxies from our initial sample, showing that their properties are also different from brighter radio galaxies and require further investigation to properly understand massive galaxy evolution.

Promotor

  • Prof.dr. H.J.A  Rottgering

Bijwonen

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Proefschriften

Proefschriften van Leidse promovendi zijn na de promotie digitaal beschikbaar via het Leids Repositorium. De proefschriften op deze site zijn vrij toegankelijk. Alleen in sommige gevallen rust er een tijdelijk embargo op een proefschrift en wordt het proefschrift pas later volledig beschikbaar gesteld.

Persvragen

Maarten Muns, adviseur wetenschapscommunicatie Universiteit Leiden
m.a.muns@bb.leidenuniv.nl
071 527 3282

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