Large-scale structure of Lyman break galaxies around a radio galaxy protocluster at z

Free access article

Issue		A&A Volume 456, Number 2, September III 2006


Page(s)		433 - 437
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20064812

A&A 456, 433-437 (2006)
DOI: 10.1051/0004-6361:20064812

Large-scale structure of Lyman break galaxies around a radio galaxy protocluster at z $\mathsf{\sim 4}$

H. T. Intema¹, B. P. Venemans¹, J. D. Kurk^{1, 2}, M. Ouchi^{3, 4}, T. Kodama^{5, 6}, H. J. A. Röttgering¹, G. K. Miley¹ and R. A. Overzier¹

¹ Sterrewacht Leiden, PO Box 9513, 2300 RA Leiden, The Netherlands
e-mail: intema@strw.leidenuniv.nl
² INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
³ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
⁴ Hubble Fellow
⁵ National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
⁶ European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany

(Received 5 January 2006 / Accepted 7 June 2006 )

Abstract
We present broad-band imaging with the Subaru Telescope of a 25' $\times$ 25' field surrounding the radio galaxy TN J1338-1942 at redshift z = 4.1. The field contains excesses of Lyman- $\alpha$ emitters (LAEs) and Lyman break galaxies (LBGs) identified with a protocluster surrounding the radio galaxy. Our new wide-field images provide information about the boundary of the protocluster and its surroundings. There are 874 candidate LBGs within our field, having redshifts in the range z = 3.5-4.5. An examination of the brightest of these (with i' < 25.0) shows that the most prominent concentration coincides with the previously discovered protocluster. The diameter of this galaxy overdensity corresponds to ~2 Mpc at z = 4, consistent with the previous estimation using LAEs. Several other concentrations of LBGs are observed in the field, some of which may well be physically connected with the z = 4.1 protocluster. The observed structure in the smoothed LBG distribution can be explained as the projection of large-scale structure, within the redshift range z = 3.5-4.5, comprising compact overdensities and prominent larger voids. If the 5-8 observed compact overdensities are associated with protoclusters, the observed protocluster volume density is ~5 $\times$ 10^-6 Mpc^-3, similar to the volume density of rich clusters in the local Universe.

Key words: cosmology: observations -- early Universe -- galaxies: clusters: general -- galaxies: high-redshift

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