UBC Theses and Dissertations

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UBC Theses and Dissertations

A multi-wavelength study of the intracluster medium in the galaxy clusters Ostapenko, Oleksandra


Galaxy clusters consist of galaxies, dark matter, and extremely hot electron gas also known as intra-cluster medium (ICM). The ICM can influence galaxy evolution by interacting with the galaxy via ram pressure stripping or cutting off the gas supply of the galaxy. Shocks in the ICM can also give us some hints about the velocity of galaxy subclusters which in its turn tells us how the universe evolves on a large scale. We present a detailed study of the ICM in three galaxy clusters MS0451, Abell2744, and MACSJ1149 using data from the Atacama Large Millimeter/Submillimeter Array (ALMA), Bolocam, and Chandra telescope. Based on the X-ray data we identified the electron number density and predicted the expected amplitude of the Sunyaev-Zeldovich (SZ) peak. The SZ effect occurs when the cosmic microwave background photons scatter on the high-energetic electrons of the medium. The amount of this scattering indicates how hot and dense the ICM is. The ALMA telescope provides a good spatial resolution to probe the properties of the ICM in more detail compared to the single-dish observatories. Our study highlights the need for additional ALMA observations using the 7-m and other arrays, or additional single-dish facilities to address further scientific questions related to the ICM in the cluster. Our study emphasizes the importance of multi-wavelength and high angular resolution observations to fully understand the gas content of galaxy clusters.

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