Abstract

TAMAYO, F. J.  and  ACEVES, H.. On the Longevity of Current Epoch Compact Group-Like Associations in a ΛCDM Cosmology. Rev. mex. astron. astrofis [online]. 2017, vol.53, n.2, 00024.  Epub Oct 21, 2019. ISSN 0185-1101.

The survival time of initially compact associations of galaxy-size dark matter halos, obtained at the present epoch from a series of ΛCDM cosmological simulations, is studied by means of dynamical N-body simulations. The time evolution of such systems from the present epoch up to 5 Gyr into the future is followed. We find that out of 14 initial compact associations only 1 (≈ 10%) suffers a full merger, and the others still have at least two discernible members in such a time span, although they have suffered multiple mergers. Our results support the hypothesis that the majority of current compact galaxy groups will not suffer a complete merger within the next few gigayears, and that some of them (≈ 10%) may even evolve without a single merger. We conclude that no overmerging problem exists in compact groups.

Keywords : dark matter; galaxies: clusters: general; - galaxies: halos; largescale structure of universe; methods: numerical.

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