Environments of Quasars in the Context of Large-Scale Structure
Abstract
We are looking at quasar environment in the context of large-scale structure (LSS) - a new approach, giving a more informed interpretation of quasar-galaxy correlations. This paper presents our first results for a sample of z ~ 0.3 quasars. We are using Voronoi tessellation applied in colour (B_J - R) slices for the detection of galaxy clusters and the minimal spanning tree (MST) to delineate the large-scale structure. This new cluster-detection method allows us to find reliably galaxy clusters at z < 0.3 from SuperCOSMOS measurements of UK Schmidt plates. By reconstructing the large-scale structure in a relatively narrow redshift band (0.2 < z < 0.3), we show that quasars follow the large-scale structure traced by galaxy clusters. None of the quasars in our radio-quiet sample is located in the central area of a galaxy cluster. Two quasars, found in a very rich environment, are actually located between two very close galaxy clusters, consistent with results on z ~ 1 quasars suggesting that cluster merg ers may be involved in one of the quasar formation mechanisms.
Keywords
Cite
@article{arxiv.astro-ph/0111115,
title = {Environments of Quasars in the Context of Large-Scale Structure},
author = {Ilona K. Söchting and R. G. Clowes and L. E. Campusano},
journal= {arXiv preprint arXiv:astro-ph/0111115},
year = {2016}
}
Comments
9 pages, Latex, 7 figures, MNRAS accepted for publication