Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jkas...41..109l&link_type=abstract
Journal of the Korean Astronomical Society, vol. 41, no. 5, pp. 109-119
Astronomy and Astrophysics
Astronomy
1
Galaxy Clusters : Individual (A1436, A1773, A1809, A2048, A2142, And A2152), Galaxy : Photometry, Galaxy : Color, Age, And Metallictiy, Galaxy : Formation And Evolution
Scientific paper
We present an optical-infrared photometric study of galaxies in six nearby clusters of galaxies at z=0.041˜0.098 (A1436, A1773, A1809, A2048, A2142, and A2152). Using BVI photometry obtained at the Bohyunsan Optical Astronomical Observatory and JHK_{S} photometry extracted from the 2-Micron All-Sky Survey catalog, we investigate the colors of galaxies in the clusters. Using the (B-V) versus (I-K_{S}) color-color diagrams in comparison with the simple stellar population model, we estimate the ages and metallicities of bright early-type member galaxies. Early-type galaxies in each cluster show the color-magnitude relation. Ages and metallicities of early-type members show little dependence on their velocity dispersions. Mean ages of early-types in the clusters range from 3 Gyr to 20 Gyr, showing a large dispersion, and mean metallicities range from Z=0.03 to 0.05 above the solar value, showing a negligible dispersion.
Kim Taehyun
Lee Jong Chul
Lee Myung Gyoon
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