Resumo

NORENA, A.; MUNOZ-CUARTAS, J. C.; QUIROGA, L. F.  e  LIBESKIND, N.. Substructure formation in tidal streams of galactic minor mergers. Rev. mex. astron. astrofis [online]. 2019, vol.55, n.2, pp.273-288.  Epub 25-Nov-2020. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2019.55.02.14.

In this work, we explore the idea that substructures like stellar clusters could be formed from the tidal stream produced in galactic minor mergers. We use N-body and SPH simulations of satellite galaxies interacting with a larger galaxy. We study the distribution of mass in streams to identify overdensity regions in which a substructure could be formed. We find that without gas, no substructure forms as none of the overdensities shows a definite morphology nor dynamical stability. Including gas we find that several clumps appear and prove to be real long standing physical structures (t ≥ 1 Gyr). We analyze the orbits, ages and masses of these structures, finding their correspondence with the halo subsystems. We conclude that it is possible to form cluster-like structures from the material in tidal streams and find evidence in favour of the presence of dark matter in these systems.

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