The clustering of K 20 galaxies in 17 radio galaxy fields

Roche, Nathan, Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X and Hippelein, Hans 1998. The clustering of K 20 galaxies in 17 radio galaxy fields. Monthly Notices of the Royal Astronomical Society 295 (4) , pp. 946-958. 10.1046/j.1365-8711.1998.01431.x

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Abstract

We investigate the angular correlation function, ω(θ), of the galaxies detected in the 2.1-μm K′ band in 17 fields (101.5 arcmin2 in total), each containing a z∼1.1 radio galaxy. There is a significant detection of galaxy clustering at a limit of K∼20, with a ω(θ) amplitude similar to that estimated by Carlberg et al. at K=21.5. The ω(θ) amplitudes of these K-limited samples are higher than expected from the faint galaxy clustering in the blue and red passbands, but consistent with a pure luminosity evolution model if clustering is stable (ϵ=0) and the correlation function of early-type galaxies is steeper than that of spirals. We do not detect a significant cross-correlation between the radio galaxies and the other galaxies in these fields. The upper limits on the cross-correlation are consistent with a mean clustering environment of Abell class 0 for z∼1.1 radio galaxies, similar to that observed for radio galaxies at z∼0.5, but would argue against an Abell class 1 or richer environment. As Abell 0 clustering around the radio galaxies would not significantly increase the ω(θ) amplitude of galaxies in these fields, stable clustering with a steep ξ(r) for E/S0 galaxies appears to remain the most likely interpretation of the ω(θ) amplitude. At K≤20, the number of galaxy-galaxy pairs of 2–3 arcsec separation exceeds the random expectation by a factor of 2.15±0.26. The excess of close pairs is comparable to that previously reported for R-band data, and consistent with a ∼(1+z)2 evolution of the galaxy merger rate.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	galaxies: clusters general; infrared: galaxies
Publisher:	Oxford University Press
ISSN:	0035-8711
Last Modified:	24 Oct 2022 11:13
URI:	https://orca.cardiff.ac.uk/id/eprint/47325

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