2005/11/25 by W. Zheng, Wei Zheng, Roderik Overzier +58 · 4 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.1086/500167
published as Astrophys.J.640:574-578,2006 · Four figures. The Astrophysical Journal: in press
arxiv created 2005/11/25 · openalex publication_date 2006/03/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
A 5 arcmin 2 region around the luminous radio-loud quasar SDSS J0836+0054 ( z = 5.8) hosts a wealth of associated galaxies, characterized by very red (1.3 < i 775 - z 850 < 2.0) color. The surface density of these z ~ 5.8 candidates is approximately 6 times higher than the number expected from deep ACS fields. This is one of the highest galaxy overdensities at high redshifts, which may develop into a group or cluster. We also find evidence for a substructure associated with one of the candidates. It has two very faint companion objects within 2'', which are likely to merge. The finding supports the results of a recent simulation, which finds that luminous quasars at high redshifts lie on the most prominent dark matter filaments and are surrounded by many fainter galaxies. The quasar activity from these regions may signal the buildup of a massive system.