How do galaxies grow?

Composite colour-image of the brightest galaxies in four groups located about 4 billion light-years away. The galaxies are ordered in increasing stellar mass, i.e. a rough time sequence. The brightest galaxies in group 1 and 2 both have obvious bright, gravitationally bound companions. Further images obtained with the Hubble Space Telescope shows that the brightest galaxy in group 3 has a double nucleus. Thus, these galaxies are currently in the process of merging. This discovery provides unique and powerful validation of hierarchical formation as manifested in both galaxy and cluster assembly.

Kredit:

ESO

O snímku

Id:eso0824a
Typ:Koláž
Datum zveřejnění:26. srpna 2008
Související články:eso0824
Velikost:1646 x 408 px

O objektu

Jméno:Galaxies
Typ:Early Universe : Galaxy : Type : Interacting
Kategorie:Galaxies

Image Formats

největší JPEG
184,2 KB

 

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