Galaxy triplets represent one of the most interesting laboratory in identifying the formation and the evolution of galaxies. In this study, we aim to investigate the signs of interaction between the members of nine isolated galaxy triplet systems (27 galaxies) selected from the “SDSS-based catalogue of Isolated Triplets” (SIT). Our sample are restricted to have members brighter than 16.5 (m r ≤ 16.5) in r-band, and mean projected separation between the members of r p < 0.3 Mpc. We based our study on the one-dimensional (1D) fitting of the surface brightness profiles of our sample and the two-dimensional (2D) fitting of their images. In 1D fitting we focused on the far outer part of the disk profile and categorized them into type I (simple exponential), type II (down-bending), and type III (up-bending). Interestingly, we found that only four galaxies have simple exponential profiles (type I), 16 galaxies of type III, five galaxies of type II, and two have complex intensity profiles of type III + II. While in 2D fitting we found that 85% (i.e. 23 galaxies) have many residuals with asymmetric features, and only four galaxies (15%) did not show any residuals.
Enviado por a.tawfeek@irya.unam.mx, 2019 Oct