Red galaxy overdensities and the varied cluster environments of powerful radio sources with z~1.6

Details Red galaxy overdensities and the varied cluster environments of powerful radio sources with z~1.6 Red galaxy overdensities and the varied cluster environments of powerful radio sources with z~1.6

2003-04-01

arxiv.org/abs/astro-ph/0304035v1

Mon.Not.Roy.Astron.Soc. 343 (2003) 1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. LaTeX, 16 pages, plus 12 additional jpeg figures, 6 in colour. A version with all figures i

Scientific paper

10.1046/j.1365-8711.2003.06667.x

The environments of a complete subsample of 6 of the most powerful radio-loud AGN at redshifts z~1.6 are investigated, using deep RJK imaging to depths of R~26, J~22.4 and K~20.6. An excess of galaxy counts in the K-band is seen across these fields; these are predominantly associated with red galaxies (R-K>4) of magnitudes 17.54) galaxies, suggesting that the morphology-density relation is imprinted into the centres of clusters at a high redshift. (ii) weaker large-scale excesses extending out to between 1 and 1.5 Mpc radius. The presence or absence of galaxy excesses on these two scales, however, differs greatly between the six different fields. The implications of these results for both cluster formation and the nature of high redshift AGN are discussed (abridged).

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