Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Discovery of Primeval Large-Scale Structures with Forming Clusters
  at Redshift 6   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.

26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
2
The categories of this paper are: math
37
The categories of this paper are: supr-con