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.

Oikeudet:

ESO

Kuvasta

Tunnistus:eso0422b
Tyyppi:Taulukko
Julkaisupäivä:7. heinäkuuta 2004
Vastaavat julkaisut:eso0422
Koko:2108 x 1284 px

Kohteesta

Nimi:K20 Field
Tyyppi:Early Universe : Cosmology : Morphology : Deep Field
Early Universe : Galaxy
Kategoria:Cosmology
Galaxies

Kuvaformaatit

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Värit ja suotimet

KaistaTeleskooppi
Very Large Telescope
FORS2