2010A&A...516A.101G


Query : 2010A&A...516A.101G

2010A&A...516A.101G - Astronomy and Astrophysics, volume 516, A101-101 (2010/6-3)

Spectroscopic confirmation of a galaxy cluster associated with 7C 1756+6520 at z=1.416.

GALAMETZ A., STERN D., STANFORD S.A., DE BREUCK C., VERNET J., GRIFFITH R.L. and HARRISON F.A.

Abstract (from CDS):

We present spectroscopic follow-up of an overdensity of galaxies photometrically selected to be at 1.4<z<2.5 found in the vicinity of the radio galaxy 7C 1756+6520 at z=1.4156. Using the DEIMOS optical multi-object spectrograph on the Keck 2 telescope, we observed a total of 129 BzK-selected sources, comprising 82 blue, star-forming galaxy candidates (sBzK) and 47 red, passively-evolving galaxy candidates (pBzK*), as well as 11 mid-infrared selected AGN candidates. We obtain robust spectroscopic redshifts for 36 blue galaxies, 7 red galaxies and 9 AGN candidates. Assuming all foreground interlopers were identified, we find that only 16% (9%) of the sBzK (pBzK*) galaxies are at z<1.4. Therefore, the BzK criteria are shown to be relatively robust at identifying galaxies at moderate redshifts. Twenty-one galaxies, including the radio galaxy, four additional AGN candidates and three red galaxy candidates are found with 1.4156±0.025, forming a large scale structure at the redshift of the radio galaxy. Of these, eight have projected offsets <2Mpc relative to the radio galaxy position and have velocity offsets <1000km/s relative to the radio galaxy redshift. This confirms that 7C 1756+6520 is associated with a high-redshift galaxy cluster. A second compact group of four galaxies is found at z∼1.437, forming a sub-group offset by Δv∼3000km/s and approximately 1.5' east of the radio galaxy.

Abstract Copyright:

Journal keyword(s): large-scale structure of Universe - galaxies: clusters: general - Galaxy: evolution - galaxies: individual: 7C 1756+6520 - galaxies: clusters: individual: 7C1756+6520

Nomenclature: Table 1, col(1): [GSS2010] Cl1756.NN (Nos 1-20). Tables 1-2, col(2): [GSS2010] sBzK.NNNNN, [GSS2010] pBzK.NNNNN, [GSS2010] AGN.NNNN N=18+35. Text: [GSS2010] 7C 1756+6520 cluster N=1.

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [DVR2000] TN J0924-2201 rG 09 24 19.94 -22 01 42.2       25.850   ~ 83 0
2 [GSS2010] Cl1756.11 G 17 56 33.160 +65 20 04.46           ~ 2 0
3 [GSS2010] Cl1756.1 G 17 56 52.560 +65 16 56.65           ~ 2 0
4 [GSS2010] Cl1756.10 G 17 56 55.750 +65 19 07.00           ~ 5 0
5 [GSS2010] Cl1756.6 G 17 56 57.670 +65 18 49.45   23.06       ~ 3 0
6 [GSS2010] Cl1756.7 G 17 57 04.980 +65 19 51.00           ~ 2 0
7 [GSS2010] Cl1756.12 G 17 57 05.040 +65 19 54.50           ~ 3 0
8 NVSS J175705+651953 rG 17 57 05.5 +65 19 54           ~ 28 2
9 [GSS2010] 7C 1756+6520 cluster ClG 17 57 05.6 +65 19 53           ~ 3 0
10 [GSS2010] Cl1756.18 G 17 57 13.080 +65 19 08.37           ~ 3 0
11 [GSS2010] Cl1756.17 G 17 57 14.410 +65 20 02.40           ~ 3 0
12 [GSS2010] Cl1756.19 G 17 57 18.310 +65 19 24.94   24.93       ~ 3 0
13 [GSS2010] Cl1756.20 G 17 57 20.760 +65 19 39.14   25.29       ~ 3 0
14 [GSS2010] Cl1756.3 G 17 57 21.750 +65 23 05.04           ~ 2 0
15 [GSS2010] Cl1756.9 G 17 57 24.430 +65 19 03.87           ~ 3 0
16 [GSS2010] Cl1756.8 G 17 57 25.000 +65 19 04.83           ~ 3 0
17 [GSS2010] Cl1756.15 G 17 57 25.200 +65 23 58.19           ~ 2 0
18 [GSS2010] Cl1756.13 G 17 57 35.340 +65 17 14.39           ~ 2 0
19 [GSS2010] Cl1756.14 G 17 57 44.060 +65 16 57.11           ~ 2 0
20 [GSS2010] Cl1756.5 G 17 57 44.400 +65 17 14.30           ~ 2 0
21 [GSS2010] Cl1756.4 G 17 57 46.540 +65 20 00.48           ~ 2 0
22 [GSS2010] Cl1756.16 G 17 57 47.400 +65 14 52.17           ~ 2 0
23 [GSS2010] Cl1756.2 G 17 57 59.550 +65 18 00.64           ~ 2 0
24 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 100 0
25 ClG J2235-2557 ClG 22 35 20.6 -25 57 42           ~ 144 0

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2023.01.27-19:22:33

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