Year: 1991
Type: article
Abstract: We have found evidence for a large, elongated group of at least ten quasars with largest dimension |$\sim 100-200 \,{h}^{-1}$| Mpc at z~ 1.3, in the direction of ESO/SERC field 927, which has the field centre (1950) |$[10^\text{h} 40^\text{m} 00^\text{s}, 05^\circ 00^{\prime} 00^{\prime{}\prime}.]$| There are probably further members that have not yet been observed. The morphology of the group seems to be like a clump, but there might be some sub-grouping on scales |$\sim 20 \,{h}^{-1}$|Mpc. The group is similar in size and number of quasars to that found by Crampton, Cowley & Hartwick (1989). The fact that two such groups are now known is evidence that the distribution of quasars is not so simple as was previously thought: at large scales |$(\gtrsim 10 \,{h}^{-1} \text{Mpc})$| the majority of quasars may be distributed uniformly and at random, but rare, large groups also occur. The groups may be large physical structures, but a strong association with the large structures of galaxies seems doubtful.
Authors: R. G. Clowes, L. E. Campusano
Institutions: Royal Observatory, University of Chile
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2016794791