Probing Distant Clusters of Galaxies at z > 1

Details Probing Distant Clusters of Galaxies at z > 1 Probing Distant Clusters of Galaxies at z > 1

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf...57n&link_type=abstract

Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja

Computer Science

Scientific paper

We investigate the properties of galaxies around the radio galaxy 3C324 at z=1.2 with BVRIK' multi-band imaging data. We apply a photometric-redshift technique to the objects in the 3C324 field, and identify 35 objects as the plausible cluster members. We find that red and luminous members are concentrated in a small region enclosed by a circle of 40" radius (˜350 kpc) from the 3C324 galaxy. The 3C324 cluster is probably much more compact in size compared with the loc Schechter function, and find the characteristic magnitude to be K'*AB=20.2±0.6. This value is consistent with the extrapolation of the pure passive evolution al clusters. We construct the K'-band luminosity function of the cluster members and fit aseen for z<1 clusters. We identify eight bright galaxies which form a red color-magnitude sequence. The slope of the sequence is consistent with the passive evolution model down to K'AB < 22, and we find that there is no clear age variation in these bright red galaxies. However, seven out of these eight galaxies exhibit a significant excess in the rest UV light with respect to the passive evolution model. This may suggest that the massive early-type galaxies in this high redshift cluster are still forming stars to some extent. We confirm the truncation of the color-magnitude sequence at K'AB ˜ 22; the faint passively-evolving galaxies may not be yet present in this cluster at z ˜ 1.2. Overall color distribution of the cluster members selected by the photometric redshift technique is found to be very broad. We derive the fraction of blue galaxies in this cluster following the definition of Butcher and Oemler (1984), and obtain fB=0.39 ± 0.28, which is higher than that for z < 1 clusters. This indicates that the star formation activity of this cluster is, on the average, higher than that of lower redshift counterparts.

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