Large groups in the Chile-UK quasar survey
Peter R. Newman, Roger G. Clowes, Luis E. Campusano, Matthew J. Graham
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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