SIMBAD references

2000ApJ...531L...5L - Astrophys. J., 531, L5-L8 (2000/March-1)

A definitive optical detection of a supercluster at z ~ 0.91.


Abstract (from CDS):

We present the results from a multiband optical imaging program that has definitively confirmed the existence of a supercluster at z~0.91. Two massive clusters of galaxies, Cl 1604+4304 at z=0.897 and Cl 1604+4321 at z=0.924, were originally observed in the high-redshift cluster survey of Oke, Postman, & Lubin. They are separated by 4300 km.s–1 in radial velocity and 17' on the plane of the sky. Their physical and redshift proximity suggested a promising supercluster candidate. Deep BRi imaging of the region between the two clusters indicates a large population of red galaxies. This population forms a tight, red sequence in the color-magnitude diagram at (R-i)~1.4. The characteristic color is identical to that of the spectroscopically confirmed early-type galaxies in the two member clusters. The red galaxies are spread throughout the 5 h–1 Mpc region between Cl 1604+4304 and Cl 1604+4321. Their spatial distribution delineates the entire large-scale structure with high concentrations at the cluster centers. In addition, we detect a significant overdensity of red galaxies directly between Cl 1604+4304 and Cl 1604+4321 which is the signature of a third, rich cluster associated with this system. The strong sequence of red galaxies and their spatial distribution clearly indicate that we have discovered a supercluster at z~0.91.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Galaxies: Clusters: Individual: Alphanumeric: Cl J1604+4304 - Galaxies: Clusters: Individual: Alphanumeric: Cl J1604+4321 - Cosmology: Large-Scale Structure of Universe

CDS comments: p. L5 : MS 0302+16 = ClG 0302+17, Cl 1604+4304 and Cl 1604+4321 are ClG J...

Simbad objects: 7

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