Large groups in the Chile-UK quasar survey

1997/10/24 by Peter R. Newman, Newman, Peter R., Roger G. Clowes +8
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/9710281

2 pages including 2 figures, Latex, sprocl.sty and psfig.sty included. To appear in proceedings of the 12th Potsdam Cosmology Workshop 1997. Larger versions of the figures are available from [email protected]

arxiv created 1997/10/24 · openalex publication_date 1997/10/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The Chile-UK quasar survey, a new-generation 140 deg² UVX survey to B = 20, is now ∼ 25 per cent complete. The catalogue currently contains 319 quasars and 93 emission line galaxies. Using the minimal-spanning tree method, we have independently confirmed the ∼ 200 h^-1 Mpc group of quasars at z ≃ 1.3 discovered by Clowes & Campusano (1991). We have discovered a new ∼ 150 h^-1 Mpc group of 13 quasars at median z ≃ 1.51. The null hypothesis of a uniform, random distribution is rejected at a level of significance of 0.003 for both groups.

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