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Formation of dwarf ellipticals and dwarf irregular galaxies by interaction of giant galaxies under environmental influence

机译：在环境影响下通过巨大星系的相互作用形成矮椭圆形和矮不规则星系

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A model is proposed for the formation of gas-rich dwarf irregular galaxies and gas-poor, rotating dwarf elliptical galaxies following the interaction between two giant galaxies as a function of space density. The formation of dwarf galaxies is considered to depend on a random variable, the tidal index Theta, an environmental parameter defined by Karachentsev et al. (2004), such that for Theta < 0 the formation of dwarf irregular galaxy is assured whereas for Theta > 0 the formation of dwarf ellipticals is preferred. It is found that for particular ranges of the interactive parameters the model predictions are in good agreement with the observed number density of the different galaxy types as a function of space density in four clusters of galaxies. This supports the fact that galaxy interactions do not all necessarily give rise to the formation of either dwarf irregulars or dwarf ellipticals. It is also shown that the formation of dwarf irregulars at high densities is much lower than that of dwarf ellipticals, and that the formation of the latter reaches a maximum at a particular space density, unlike the former. This suggests that at high densities many dwarf irregulars are stripped of their gaseous envelopes to become dwarf elliptical. (C) 2014 Elsevier B.V. All rights reserved.
机译：提出了一个模型，用于根据两个巨大星系之间的相互作用，根据空间密度形成富气的矮星不规则星系和贫气的旋转矮星椭圆星系。矮星系的形成被认为取决于一个随机变量，即潮汐指数Theta，这是Karachentsev等人定义的环境参数。 （2004年），使得对于Theta <0，可以确保形成矮小的不规则星系，而对于Theta> 0，则可以形成矮小的椭圆形。发现，对于交互参数的特定范围，模型预测与观察到的不同星系类型的数量密度（在四个星系团中作为空间密度的函数）非常一致。这支持了这样一个事实，即星系相互作用并不一定会导致形成不规则的矮人或椭圆形的矮人。还显示出高密度的矮小不规则形的形成要比矮椭圆形低得多，并且与前者不同，后者在特定的空间密度下形成最大。这表明在高密度下，许多矮小的不规则形物被剥夺了它们的气态包膜，成为矮小的椭圆形。 （C）2014 Elsevier B.V.保留所有权利。

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