Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The bright galaxy population of five medium redshift clusters. I.
  Color-Magnitude Relation, Blue Fractions and Visual Morphology   Using data of five clusters of galaxies within the redshift range 0.15 $\leq$
z $\leq$ 0.25, imaged with the Nordic Optical Telescope (NOT) in the central
$\approx$ 1 Mpc$^2$ in very good seeing conditions, we have performed an
exhaustive inspection of their bright galaxy population. That range of
redshift, where only a small amount of data with the required resolution and
quality is available, is particularly important for the understanding of the
formation and evolution of clusters of galaxies. We have inspected the
color-magnitude relation (CMR) for those clusters and measured the blue
fraction of galaxies in their cores to check for evidence of evolution as found
in other works. Moreover, the visual classification of the galaxy morphology
has been performed and the morphology-radius relation has been examined We have
not found signs of evolution neither in the slope of the CMR nor in the blue
fraction of galaxies. A diversity of situations regarding those parameters and
in the morphological mixing has been noticed, with two out of five clusters
containing a dominant late-type core population. The cluster A1878 stands out
as some of its properties differ from those of the other clusters in the
sample.
  No clear signs of evolution appear in our analysis. The data support the view
that the morphology and the stellar content of the galaxies in our clusters
have been already settled at z $\sim$ 0.2. Only the fraction of interacting
galaxies in the clusters appear to be larger than in clusters like Coma
although the number of clusters in the sample is small to give a definitive
conclusion.

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The categories of this paper are: patt-sol
2
The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci