The Angular Correlation Function of K=19.5 Galaxies and the Detection of a Cluster at z=0.775

Details The Angular Correlation Function of K=19.5 Galaxies and the Detection of a Cluster at z=0.775 The Angular Correlation Function of K=19.5 Galaxies and the Detection of a Cluster at z=0.775

1998-09-22

arxiv.org/abs/astro-ph/9809271v2

Astronomy and Astrophysics

Astrophysics

14 pages, latex, 8 figures, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.1999.02536.x

On five K-band Omega camera images, covering a total of 162.2 sq. arcmin to K=19.5, we investigate (i) the clustering environment of 5 radio galaxies at 0.71.5) redshifts. We also find a significant excess of 1.5--5.0 arcsec separation pairs of galaxies compared to the expectation from the inward extrapolation of omega(theta). To K=19.5, we estimate that 11.0\pm 3.4 per cent of galaxies are in close pairs in excess of omega(theta). This can be explained if the local rate of galaxy mergers and interactions increases with redshift as $\sim (1+z)^m$ with $m=1.33_{-0.51}^{+0.36}$.

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