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.

Mynd/Myndskeið:

ESO

Um myndina

Auðkenni:eso0824a
Tegund:Háskóli
Útgáfudagur:26. ágúst 2008
Tengdar fréttatilkynningar:eso0824
Stærð:1646 x 408 px

Um fyrirbærið

Nafn:Galaxies
Tegund:Early Universe : Galaxy : Type : Interacting
Flokkur:Galaxies

Myndasnið

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