All these processes should be more common in regions of higher galaxy density

All these processes should be more common in regions of higher galaxy density

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All these processes should be more common in regions of higher galaxy density, like the whole universe long ago. What do we see at higher redshifts? This issue will be crucial in understanding galaxy evolution. Since mergers can trigger huge starbursts, and perhaps transform galaxy types, they may have been a controlling influence on galaxy evolution. In fact, galaxy formation is now thought to have been rather protracted, building up piece by piece from smaller constituents, so mergers might be our best present analogs to protogalaxies (see Djorgovski in Nearly Normal Galaxies , p. 290, for a statement of how rapidly the conventional wisdom can evolve). Most people who have inspected deep HST images have remarked on how many funny-looking galaxies they see, and quantitative studies back this up both as to number of statistically defensible pairs and number of "peculiar" systems, though one must be wary of passband and surface-brightness selection effects. Some of these oddities appear in this snippet
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All these processes should be more common in regions of higher galaxy density

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