Roger G. Clowes

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A large quasar group (LQG) of particularly large size and high membership has been identified in the DR7QSO catalogue of the Sloan Digital Sky Survey. It has characteristic size (volume 1/3) ∼500 Mpc (proper size, present epoch), longest dimension ∼1240 Mpc, membership of 73 quasars and mean redshift ¯ z = 1.27. In terms of both size and membership, it is(More)
The largest known structure in the high redshift universe is mapped by at least 18 quasars and spans ∼ 5 • × 2.5 • on the sky, with a quasar spatial overdensity of 6–10 times above the mean. This large quasar group (LQG) provides an extraordinary laboratory ∼ 100 × 200 × 200h −3 comoving Mpc 3 in size (q 0 = 0.5, Λ = 0, H 0 = 100h km s −1 Mpc −1) covering(More)
  • BREAK GALAXIES, L. Haberzettl, +11 authors I. K. Söchting
  • 2009
The nature of galaxy structures on large scales is a key observational prediction for current models of galaxy formation. The Sloan Digital Sky Survey (SDSS) and the 2dF galaxy survey have revealed a number of structures on 40–150 h −1 Mpc scales at low redshifts, and some even larger ones. To constrain galaxy number densities, luminosities, and stellar(More)
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