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.

Telif:

ESO

Görüntü Hakkında

Kimlik:eso0824a
Tür:Kolaj
Yayın tarihi:26 Ağustos 2008
Bağlantılı bültenler:eso0824
Boyut:1646 x 408 px

Nesne Hakkında

Adı:Galaxies
Tür:Early Universe : Galaxy : Type : Interacting
Kategori:Galaxies

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