PUBLICATIONS OF THE ASTRONOMICAL OBSERVATORY OF BELGRADE104, Page 125-132, https://doi.org/10.69646/aob104p125
PROCEEDINGS of the XX Serbian Astronomical Conference, Belgrade, October 16 - 20, 2023, Edited by Jelena Petrović, Dušan Marčeta and Ana Lalović
Published by: Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia

Abstract. We investigate the properties of the Giant Stellar Stream (GSS), formed in the merger of Andromeda galaxy (M31) and dwarf galaxy, the satellite of M31. We used N-body simulations to explain the properties of tidal substructures. The orientation of the GSS, distances, and velocities from our simulation are in agreement with the observed one. We confirmed that the Northeast shelf (NE) and West shelf (W) were formed in the same merger event. For the first time, we explained the observed metallicity distribution in the GSS and shell system. With a linearly decreasing gradient of the initial metallicity in the dwarf galaxy before the merger, using Monte Carlo (MC) simulations, we successfully explained the observed metallicity distribution in these substructures. These results are a contribution to the investigation of metallicity gradients in dwarf galaxies which is important for galaxy evolution in general.