2004/03/31 by R. R. Gal, L. M. Lubin · 3 citations
Chemistry · Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Chemistry #Galaxies: Formation, Evolution, Phenomena #Galaxy #Physics #Redshift #Sky #Stellar, planetary, and galactic studies #Supercluster (genetic) #astro-ph
paper · pdf · doi:10.1086/421463
published as Astrophys.J. 607 (2004) L1-L4 · Accepted to ApJ Letters. 4 pages with 3 figures
arxiv created 2004/03/31 · openalex publication_date 2004/04/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present spectroscopic confirmation of the Cl 1604 supercluster at z ~ 0.9. The supercluster was originally detected as two individual clusters, Cl 1604+4304 at z = 0.90 and Cl 1604+4321 at z = 0.92, which are closely separated in both redshift and sky position. Subsequent imaging revealed a complex of red galaxies bridging the two clusters, suggesting that the region contained a large-scale structure. We have carried out extensive multiobject spectroscopy, which, combined with previous measurements, provides ~600 redshifts in this area, including 230 confirmed supercluster members. We detect two additional clusters that are part of this structure, Cl 1604+4314 at z = 0.87 and Cl 1604+4316 at z = 0.94. All four have properties typical of local clusters, with line-of-sight velocity dispersions between 489 and 962 km s -1 . The structure is significantly extended in redshift space, which, if interpreted as a true elongation in real space, implies a depth of 93 h Mpc. We examine the spatial and redshift distribution of the supercluster members.