Changes in disk galaxy chemical abundance due to minor merger

Physics – Space Physics

Scientific paper

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Scientific paper

By means of numerical modelling we received the chemical gradient evolution in galaxy disk and investigated changes in disk galaxy chemical abundance due to minor merger of disk galaxy and dwarf galaxy with lower heavy elements abundance. After the merger the galaxy disk structure and its chemical abundance change, galaxy disk becomes richer on the maintenance of heavy elements. Also we have found, that presence of a dwarf galaxy with lower abundance of heavy elements in the halo of disk galaxy as well as its presence in disk give in result the formation of the compact area with the lowered heavy elements abundance on the schedule of heavy elements radial distribution. This result says that there is the possibility of finding the satellite with lower abundance of heavy elements in disk galaxy owing to its radial distribution. Defining the position of compact area with the lowered heavy elements abundance on the schedule of heavy elements radial distribution we can find the position of the satellite in halo or in disk of the disk galaxy. We have compared the received results with the observational data for disk galaxy NGC 2903 and have found, that in this galaxy the manifestations of the dwarf galaxy with lower abundance of heavy elements minor merger are observed. On the basis of our results we can say that about 4 bilions years ago disk galaxy NGC 2903 caught and absorbed dwarf galaxy with lower heavy elements abundance. In result the galaxy disk becomes richer on the maintenance of heavy elements. Also due to minor merger the bar and twist in the ring spirals have arisen in NGC 2903. Now dwarf galaxy remains getting mixed up with the central regions of galaxy disk inducing star-forming shapes.

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