Examination of Star Formation Rate enhancement in galaxy pairs selected based on data from Illstris TNG

Abstract

Star Formation Rate (SFR) is one of the most important properties of galaxies, which offers a good insight of galaxy evolution. Generally, interactions with the small and large scale environment may affect the SFR of the galaxy. Therefore, an examination of SFR of galaxy pairs is carried out in this paper to investigate the partner galaxy impacts on the evolution process of one galaxy. Compared with isolated galaxies, the SFR of galaxy pairs is enhanced due to interactions with the large scale environment (e.g., the tidal force). This finding confirms that interactions with the large scale environment will affect the galaxy evolution process and further work can be done to examine the impacts of other interactions. These results shed light on the deeper understanding of galaxy evolution process and call on more investigation of large scale environment of the galaxy.