Downsizing from the point of view of merging model (preliminary discussion)

TL;DR

This paper proposes a simple model to explain the observed phenomenon of galaxy downsizing, where the mass of the most massive galaxies decreases over time, contrasting with merger processes that only increase mass.

Contribution

It introduces an elementary model for galaxy downsizing, providing a new perspective on mass reduction in massive galaxies over cosmological timescales.

Findings

Model explains observed decrease in galaxy mass over time.

Contrasts with traditional merger models that only increase galaxy mass.

Provides a preliminary discussion on galaxy mass evolution.

Abstract

In four-particle scattering processes with transfer of mass, unlike mergers in which mass can only increase, mass of the most massive galaxies may be reduced. Elementary model describing such process is considered. In this way, it is supposed to explain observed phenomenon of downsizing when increasing of characteristic mass the heaviest galaxies over cosmological time replaces by its reduction.