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.

Oikeudet:

ESO

Kuvasta

Tunnistus:eso0824a
Tyyppi:Kokoelma
Julkaisupäivä:26. elokuuta 2008
Vastaavat julkaisut:eso0824
Koko:1646 x 408 px

Kohteesta

Nimi:Galaxies
Tyyppi:Early Universe : Galaxy : Type : Interacting
Kategoria:Galaxies

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