Analysis of Galaxy, Black hole and BH-BH mergers based on IllustrisTNG

Abstract

Contemporarily, one of the most significant current trends in the studies of black holes is the black hole mergers. In this paper, we would present prescriptions for star formation and stellar evolution of black hole, and make comparisons in features of the black holes before and after the merger. Based on Illustris TNG, we collect our data to investigate Galaxy and black hole mergers and utilize the corresponding programming API function on it to visualize the results. Specifically, the relationship between galaxy mass and gas size will be demonstrated with the help of diagrams in part one. Besides, the general relationship between the characteristics of the black holes before the merger and the characteristics of the black hole after the merger will be discussed. The variance and standard division of the data will be calculated to confirm the relationship. These results explore the basic relationship between galaxies and the similarity between black holes before and after the merger, which shed light on further understanding of the corresponding processes.