Averaged spectrum of old galaxies

Averaged spectrum (blue) of four old massive galaxies compared to a set of template spectra. The bottom compares it with the spectrum of a star having a surface temperature of 7200 degrees (green) and 6800 degrees (red), respectively. The upper graph makes a comparison with synthetic spectra of simulated simple stellar populations with ages of 500, 1,100 and 3,000 million years. This figure demonstrates that the newly found galaxies mostly contain old low-mass stars and must have formed between 1,000 and 2,000 million years earlier than the epoch at which they are now seen.

Bildnachweis:

ESO

Über das Bild

ID:eso0422b
Typ:Aufsuchkarte
Veröffentlichungsdatum:7. Juli 2004
Dazugehörige Veröffentlichungen:eso0422
Größe:2108 x 1284 px

Über das Objekt

Name:K20 Field
Typ:Early Universe : Cosmology : Morphology : Deep Field
Early Universe : Galaxy
Kategorie:Cosmology
Galaxies

Bildformate

Großes JPEG
533,3 KB

Farben & Filter

SpektralbereichTeleskop
Very Large Telescope
FORS2