Color and Morphology of Galaxies in the Region of the 3C 324 Clusters at z $\sim$ 1.2

Details Color and Morphology of Galaxies in the Region of the 3C 324 Clusters at z $\sim$ 1.2 Color and Morphology of Galaxies in the Region of the 3C 324 Clusters at z $\sim$ 1.2

1999-09-21

arxiv.org/abs/astro-ph/9909348v1

Astronomy and Astrophysics

Astrophysics

12 pages, 10 figures, accepted for publication in PASJ

Scientific paper

We investigated the color and morphology of optically selected galaxies in the region of clusters at z $\sim$ 1.2 near to the radio galaxy 3C 324 using archived data taken with the Hubble Space Telescope. The faint galaxies selected at the HST F702W band that contribute to the surface-density excess of the region have wide ranges of color, size, and morphology, which are not likely to be due to contamination by foreground galaxies. Namely, the rest-frame ultraviolet emission properties of the galaxies in the clusters are not very homogeneous; various amounts of star-formation activity may occur in a significant fraction of them. Although our analysis is purely statistical, we find that typical star-forming galaxies with blue colors have a relatively late-type morphology compared to the red quiescent population in the systems.

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