Composite Spectrum of 24 Massive Dead Galaxies (IMAGE)

National Institutes of Natural Sciences

Composite Spectrum of 24 Massive Dead Galaxies

Caption

The spectra is equivalent to 200 hours of Subaru Telescope's observing time. Rectangles on the spectrum indicate spectral features, which are used to calculate the ages, the amount of heavy elements and the alpha-element abundance in the stellar populations of these galaxies.

Credit

ETH Zurich/NAOJ

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