Résumé / Abstract Journal-club_Galaxies

Séminaire/Seminar Galaxies

« A multi-wavelength study of the intracluster medium in the MS0451 galaxy cluster using ALMA and Chandra observations »

Oleksandra Ostapenko
Physics and Astronomy Department, The University of British Columbia (Vancouver, Canada)

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 the MS0451 galaxy cluster using Band 3 data from the Atacama Large Millimeter/Submillimeter Array (ALMA) and X-ray data from the 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 Total power arrays to address further scientific questions related to the ICM in the cluster. Specifically, we identified the need for shorter baseline observations to probe the extended ICM structure with ALMA.Our study provides new insights into the complex nature of the ICM in galaxy clusters and emphasizes the importance of multi-wavelength observations to fully understand the gas content of galaxy clusters.
jeudi 4 mai 2023 - 11:30
Salle des séminaires Évry Schatzman
Institut d'Astrophysique de Paris
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