#TITLE_ALTERNATIVE#

• Main Author: AZIZUL HAKIM (NIM : 10310009), MUHAMMAD
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29154
• Institution: Institut Teknologi Bandung

Clusters of galaxies are the largest and most massive virialized structure in the universe. Hence, it has been argued that their matter content should provide a fair sample of matter content of the universe. Based on that fact, studying clusters is really important for cosmology. For that reason, cosmologists need better understanding of physical parameters and physical processes of clusters, on large scale samples of clusters. <br /> <br /> Clusters of galaxies can be considered as self-similar systems. Self similarity principle predicts some tight relations between physical parameters of clusters, known as scaling relations. Using scaling relations, one can determine not easily determined parameters or non-observables (e.g. total mass of cluster), from more readily observed parameters (such as luminosity and temperature). One also might determine physical parameters of large scale samples of clusters using scaling relations. <br /> <br /> The purpose of this work is to check the validity of scaling relations of galaxy clusters, with several sample in the literatures, and from different missions, different observational criteria, and different criteria of clusters. This work using 463 clusters in total, in the redshift range of . Different number of sample were employed for each scaling relations. <br /> <br /> In general, the scaling relations in this study are consistent with predictions of self similarity theory and literature, or at least we can propose possible explanations in the case of deviation from the theory. Relations that involve non-bolometric luminosity (e.g. luminosity determined from ROSAT) need to be modified. Some relations (such as and ) are sensitive to the relaxation states of the clusters, as well as to the enclosing radius within which parameters are determined.