Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289l..27t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 1, p. L27-L30
Astronomy and Astrophysics
Astrophysics
6
Galactic Clusters, Galactic Evolution, Images, Spectral Energy Distribution, Star Distribution, Star Formation, Stellar Spectra, Visible Spectrum, Image Analysis, Red Shift, Spectrum Analysis, Stellar Spectrophotometry, Visual Photometry
Scientific paper
The galaxy clusters Cl 1602 + 4313 (z = 0.895) and Cl 2155 + 0334 (z = 0.820) were observed with broad-band B, R and four intermediate band filters (FWHM = 100-200 A) in order to derive low-resolution spectral energy distributions of cluster galaxies. Standard galaxy spectra and models for E + A-galaxies were fitted to the data. Cl 2155 turned out to be not a galaxy cluster but a random fluctuation of field galaxies. The cluster characteristics of Cl 1602 were confirmed. No galaxy similar to an old elliptical has been found. Instead, there is strong evidence that several galaxies recently (less than or equal to 2 Gyr) run through an intense phase of star formation. Their spectral energy distributions are very well fitted with E + A-type spectra, being the first possible detection of such post-forming galaxies at z greater than 1.0 has been detected in the background of the cluster.
Belloni Paola
Thimm Guido J.
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