Nature of blue galaxies in the cluster C11447 + 2619

Details Nature of blue galaxies in the cluster C11447 + 2619 Nature of blue galaxies in the cluster C11447 + 2619

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310...31b&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, July 5, 1984, p. 31-33.

Mathematics

Logic

36

Astronomical Spectroscopy, Galactic Clusters, Ubv Spectra, Astronomical Photometry, Color, Stellar Evolution

Scientific paper

Photometric studies of distant clusters of galaxies provide evidence for significant evolution of the member galaxies during the relatively recent cosmological past. Here, spectroscopy is presented that confirms a previous photometric result that the distant (z = 0.38) cluster C11447 + 2619 contains the largest excess of blue galaxies yet encountered. The galaxy surface density profile of the cluster shows it to be open and irregular, making it the first such cluster to be studied at high redshift. The spectra indicate that the blue colors are predominantly the result of recent star formation. It is speculated that vigorous star formation in galaxies, independently of their environments, was much more common several Gyr ago than it is in the Universe today.

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