The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6

Details The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6 The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6

2004-12-29

arxiv.org/abs/astro-ph/0412648v1

Astrophys.J.620:L1-L4,2005

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, to be published in ApJL. The paper with high resolution figures is available at http://www-int.stsci.edu

Scientific paper

10.1086/428499

We report the discovery of primeval large-scale structures (LSSs) including two proto-clusters in a forming phase at z=5.7. We carried out extensive deep narrow-band imaging in the 1 deg^2 sky of the Subaru/XMM-Newton Deep Field, and obtained a cosmic map of 515 Ly alpha emitters (LAEs) in a volume with a transverse dimension of 180 Mpc x 180 Mpc and a depth of ~40 Mpc in comoving units. This cosmic map shows filamentary LSSs, including clusters and surrounding 10-40 Mpc scale voids, similar to the present-day LSSs. Our spectroscopic follow-up observations identify overdense regions in which two dense clumps of LAEs with a sphere of 1-Mpc diameter in physical units are included. These clumps show about 130 times higher star-formation rate density, mainly due to a large overdensity, ~80, of LAEs. These clumps would be clusters in a formation phase involving a burst of galaxy formation.

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