Astrophysics (Index)About

Butcher-Oemler effect

(BOE)
(observation of more blue galaxies at z > 0.3)

The Butcher-Oemler effect (sometimes abbreviated BOE) is an observed distribution of the characteristics galaxies, that at middle-to-high redshifts (z = 0.3 up to perhaps z = 1), there is a higher percentage of blue galaxies than found nearer the present time. Blue indicates spectral class stars which are a sign of very recent star formation, so the observed distribution suggests a higher star formation rate in that era than at present. The effect was published in 1978 and is still of research interest.


(galaxies,cosmology,star formation)
Further reading:
http://en.wikipedia.org/wiki/Butcher-Oemler_Effect
https://astronomy.swin.edu.au/cosmos/b/Butcher-Oemler+Effect
http://www.astro.uvic.ca/~jwillis/teaching/astr580/A580_B0.pdf
https://ui.adsabs.harvard.edu/abs/1978ApJ...219...18B/abstract
https://www.cfht.hawaii.edu/~morrison/home/notes/BO.html

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