Morphological and photometric investigation of some galaxy triplet systems /
دراسة مورفولوجية و فوتومترية لبعض أنظمة المجرات الثلاثية
Amira Ahmed Tawfeek Abdelfatah ; Supervised Hayman Zain Metwally , Zainab Mohamed Awad , Gamal Bakr Ali
- Cairo : Amira Ahmed Tawfeek Abdelfatah , 2019
- 200 P. : facsimiles ; 25cm
Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Astrophysics and Meteorology
Galaxy triplets represent one of the most interesting lab- oratory in identifying the formation and the evolution of galaxies. Understanding such systems will give us clues about the construction of larger groups and clusters of galaxies. In this thesis, we aim to investigate the nature of galaxy triplet systems and the possibility of merger be- tween their members. Toward that, we conduct a statis- tical study on 315 isolated triplet systems taken from the 2SDSS-based catalog of Isolated Triplets3(SIT) to obtain their physical and dynamical parameters. Meanwhile, the correlation between the dynamical parameters of these systems and the Large-Scale Structure (LSS) have been presented. Consequently, we confront our results with those obtained for a sample of triplets from the Local Su- percluster (LS), SDSS-triplets, Tullys catalogue, Wide (W) and Compact (K) triplets. For further details about triplet systems and signs of interactions between their members, we applied surface photometry analysis and de- composition on nine galaxy triplets to declare their radial proles and identify their ne structures. Interestingly, we found that triplet systems follow hierarchical structure in their formation and evolution. In addition, we found that signs of interactions are pronounced in systems with small projected separations between their members rp < 0.3 Mpc