Abstract Details

Name: Ankit Kumar
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2021_513
Title : Effect of Flyby Interactions on the Bulge and Disk of the Galaxy
Authors and Co-Authors : Ankit Kumar (IIA), Mousumi Das (IIA), Sandeep Kumar Kataria (IIA)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : There are two types of interactions in galaxies: mergers and flybys. There has been a lot of study of mergers in literature but flybys are largely ignored. Recent cosmological simulations suggest that mergers and flybys play an equal role in the formation and evolution of the galaxies at low redshift. Both processes produce enhanced star formation, extended tidal features, bars, spiral arms and warps in the disks of galaxies. The results of galaxy interactions depend on many factors such as galaxy mass ratios, the distance of the closest approach, gas content and orientation of the interacting galaxies. In this study, we investigate the minor interactions of two disk galaxies with mass ratio 10:1 and 5:1 in flyby encounters that do not lead to a merger. In our N-body simulations, we generate two disk galaxies having three components; dark matter halo, disk, and bulge. We vary only the pericenter distances to see the effect of minor flybys on the bulge and disk of the major galaxy over the course of the trajectory. For the detailed study of the bulges, the simulation has been performed for both classical and pseudo bulges. At different time steps of the evolution, we did two dimensional fittings of disk, bulge and bar of the major galaxy to trace the variation in the sersic index and mass of the bulge. The effects of tidal force on the disk are characterized in terms of spiral strength, disk scale radius, and disk scale height. In this conference, we shall present the basics of simulations and our findings of flybys interactions in late universe.