Environment plays an important role in the evolution of galaxies. In particular, denser
environments, such as galaxy clusters and large-scale field filaments of the cosmic web
have been found to reduce star formation in galaxies. The intersection of these environments
provides an interesting regime of study. We investigate how cosmic filaments
impact the quenching of galaxies within one virial radius of 324 simulated clusters. We
use hydrodynamic runs from The Three Hundred Project along with the cosmic web
extractor DisPerSE to track filaments and the structure finder VELOCIraptor to identify
halos hosting galaxies. Limited by the resolution of the simulation, we examine star
formation indirectly by way of galaxy colour and cold gas fraction. We find that cluster
galaxies residing closer to filaments tend to be star-forming, bluer, and contain more
cold gas than their counterparts further away from filaments. This is in stark contrast
with galaxies residing outside of clusters, where galaxies close to filaments show clear
signs of density related pre-processing. Careful examination of flows around and into
cluster galaxies strongly suggests that the colder, dynamically coherent hydrodynamic
streams along intra-cluster filaments partially shield galaxies close to them from strangulation
by the hot, dense intra-cluster medium. These streams, in addition to the reduced
density contrast of intra-cluster filaments with the intra-cluster medium, also limit the
ram pressure stripping experienced by cluster galaxies. We further examine stripping in
the context of gas disturbances in phase space to create a classification for wet and dry
galaxies. / Thesis / Master of Science (MSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/25722 |
| Date | January 2020 |
| Creators | Kotecha, Sachin |
| Contributors | Wadsley, James, Welker, Charlotte, Physics and Astronomy |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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