The influence of mergings on galaxy evolution |
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Authors: | Victor M Kontorovich Sergey I Shelyag |
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Institution: | (1) Institute of Radio Astronomy of NAS, Ukraine |
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Abstract: | The evolution of the galaxy mass function MF (and luminosity function LF) depending on merging of galaxies is discussed. The
richness and masses of most massive (and most luminous) galaxies of a cluster are chosen as a characteristic of the bright
edge of LF. Mergers are simulated by a Monte-Carlo method. The probability of merging depends on the masses of galaxies. The
ratio of the current number of galaxies to the initial one plays the role of the time scale. Transformation to real time and
redshift is realized with help of the Smoluchowsky kinetic equation (SE) solution, describing the merging process and making
possible to find the dependence of the galaxy number on time. The dependencies of richness, masses and magnitude differences
of most massive and brightest galaxies of a cluster on redshift have been obtained. Creation of cD-galaxy has been retraced
on small redshifts. The masses of the second and less massive cluster galaxies grow, but after the creation of the cD-galaxy
they begin to decrease. Comparison of obtained results with data of the catalogues is provided. Correspondence in mentioned
dependencies is observed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | galaxy merging mass function richness cluster evolution |
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