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.

Credit:

ESO

About the Image

Id:eso0422b
Type:Chart
Release date:7 July 2004
Related releases:eso0422
Size:2108 x 1330 px

About the Object

Name:K20 Field
Type:• Early Universe : Galaxy
• Early Universe : Cosmology : Morphology : Deep Field
• X - Galaxies
• X - Cosmology

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BandTelescope
Very Large Telescope
FORS2

 

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