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 |
Colours & filters
| Band | Telescope |
| Very Large Telescope FORS2 |
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