2010A&A...522A..58G


Query : 2010A&A...522A..58G

2010A&A...522A..58G - Astronomy and Astrophysics, volume 522, A58-58 (2010/11-1)

Galaxy protocluster candidates at 1.6<z≲2.

GALAMETZ A., VERNET J., DE BREUCK C., HATCH N.A., MILEY G.K., KODAMA T., KURK J., OVERZIER R.A., RETTURA A., ROETTGERING H.J.A., SEYMOUR N., VENEMANS B.P. and ZIRM A.W.

Abstract (from CDS):

We present a study of protoclusters associated with high redshift radio galaxies. We imaged MRC 1017-220 (z=1.77) and MRC 0156-252 (z=2.02) using the near-infrared wide-field (7.5'x7.5') imager VLT/HAWK-I in the Y, H, and Ks bands. We present the first deep Y-band galaxy number counts within a large area (∼200arcmin2). We develop a purely near-infrared colour selection technique to isolate galaxies at 1.6<z<3 that may be associated with the two targets, dividing them into (i) red passively evolving or dusty star forming galaxies or (ii) blue/star formation dominated galaxies with little or no dust. Both targeted fields show an excess of star forming galaxies with respect to control fields. No clear overdensity of red galaxies is detected in the surroundings of MRC 1017-220 although the spatial distribution of the red galaxies resembles a filament-like structure within which the radio galaxy is embedded. In contrast, a significant overdensity of red galaxies is detected in the field of MRC 0156-252, ranging from a factor of ∼2-3 times the field density at large scales (2.5Mpc, angular distance) up to a factor of ∼3-4 times the field density within a 1Mpc radius of the radio galaxy. Half of these red galaxies have colours consistent with red sequence models at z∼2, with a large fraction being bright (Ks<21.5, i.e. massive). In addition, we also find three galaxies within 5" of MRC 0156-252 suggesting that the radio galaxy has multiple companions within ∼50kpc. We conclude that the field of MRC0156-252 shows many remarkable similarities with the well-studied protocluster surrounding PKS1138-262 (z=2.16) suggesting that MRC 0156-252 is associated with a galaxy protocluster at z∼2.

Abstract Copyright:

Journal keyword(s): large scale structure of Universe - galaxies: clusters: general - Galaxies: evolution - galaxies: high redshift - galaxies: individual: MRC 1017-220 - galaxies: individual: MRC 0156-252

Simbad objects: 11

goto Full paper

goto View the references in ADS

Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 MRC 0156-252 rG 01 58 33.480 -24 59 32.01   22.7       ~ 49 0
2 ClG J0218-0510 ClG 02 18 21.3 -05 10 27           ~ 64 0
3 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1140 1
4 [CDD99] J101948-2219.8 G 10 19 48 -22 19.8           ~ 2 0
5 PKS J1019-2220 rG 10 19 49.00 -22 19 58.0           ~ 26 1
6 [CDD99] J101950-2220.9 G 10 19 50 -22 20.9           ~ 2 0
7 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 257 1
8 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4398 2
9 NVSS J175705+651953 rG 17 57 05.5 +65 19 54           ~ 28 2
10 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 94 0
11 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 140 0

To bookmark this query, right click on this link: simbad:objects in 2010A&A...522A..58G and select 'bookmark this link' or equivalent in the popup menu


2021.10.17-14:49:48

© Université de Strasbourg/CNRS

    • Contact