Merging groups of galaxies
نویسندگان
چکیده
منابع مشابه
Evolution of Compact Groups of Galaxies I . Merging rates
We discuss the merging rates in compact groups of 5 identical elliptical galaxies. All groups have the same mass and binding energy. We consider both cases with individual halos and cases where the halo is common to all galaxies and enveloping the whole group. In the latter situation the merging rate is slower if the halo is more massive. The mass of individual halos has little influence on the...
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It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...
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Gravitational interactions and mergers affect the morphologies and dynamics of galaxies from our Local Group to the limits of the observable universe. Observations of interacting galaxies at low redshifts (z ∼< 0.2) yield detailed information about many of the processes at work. I briefly review these processes and the growing evidence that mergers play a major role in the delayed formation of ...
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We investigate the incidence of major mergers creating Mstar > 10M⊙ galaxies in the dense environments of present-day groups and clusters more massive than Mhalo = 2.5 × 10M⊙. We identify 38 pairs of massive galaxies with mutual tidal interaction signatures selected from > 5000 galaxies with Mstar ≥ 5×10M⊙ that reside in a halo mass-limited sample of 845 groups. We fit the images of each galaxy...
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Numerical simulations of cluster mergers reveal many characteristics of the merging process: shock structure and strength, observational signatures of the dynamical state, effects on the mass determination, turbulence and the evolution of the X-ray luminosity and the magnetic field. In this article I review the results obtained from various simulations over the last years.
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ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/338119a0