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

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Volume 516 (June-July 2010)

A&A, 516 (2010) A101

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Table 1:

Spectroscopic members of the structure around 7C 1756+6520.
ID	Name^a	RA	Dec	$z_{\rm spec}$	Q^b	B^c	z^c	K^c	Notes
		(J2000)	(J2000)			(AB)	(AB)	(AB)
Cl 1756.1	AGN.1110	17:56:52.56	65:16:56.65	$1.3935\pm0.0012$	B	23.21	22.14	20.89	B2900, B3260, [OII]
Cl 1756.2	sBzK.6355	17:57:59.55	65:18:00.64	$1.4020\pm0.0001$	A	24.36	23.34	21.54	[OII]
Cl 1756.3	sBzK.9622	17:57:21.75	65:23:05.04	$1.4064\pm0.0005$	A	24.00	22.78	20.38	[OII]
Cl 1756.4	sBzK.7556	17:57:46.54	65:20:00.48	$1.4081\pm0.0007$	A	20.97	20.77	20.35	AGN: broad MgII, [OII]
Cl 1756.5	pBzK.5858	17:57:44.40	65:17:14.30	$1.4110\pm0.0010$	B	>27.1	23.80	21.62	[OII]; ID31 in G09
Cl 1756.6	serendip.1	17:56:57.67	65:18:49.45	$1.4150\pm0.0005$	A	-	-	-	[OII]
Cl 1756.7^d	AGN.1354	17:57:04.98	65:19:51.00	$1.4153\pm0.0003$	B	26.34	22.03	-	AGN: broad MgII
HzRG	7C 1756+6520	17:57:05.48	65:19:53.75	$1.4156\pm0.0001$	A	>27.1	21.40	20.17	AGN: [NeV], [OII], [NeIII]
Cl 1756.8	serendip.2	17:57:25.00	65:19:04.83	$1.4157\pm0.0010$	A	26.32	24.34	>23.4	[OII]
Cl 1756.9	sBzK.6997	17:57:24.43	65:19:03.87	$1.4157\pm0.0006$	A	25.21	24.21	22.56	[OII]
Cl 1756.10	AGN.1317	17:56:55.75	65:19:07.00	$1.4162\pm0.0005$	A	20.16	19.46	19.01	AGN: broad MgII, [NeV], [OII]
Cl 1756.11	sBzK.7624	17:56:33.16	65:20:04.46	$1.4236\pm0.0001$	A	22.51	22.39	21.30	FeII+MgII absn, [OII ]
Cl 1756.12^e	pBzK.7523	17:57:05.04	65:19:54.50	$1.4244\pm0.0004$	A	>27.1	23.47	21.31	[OII]; ID43 in G09
Cl 1756.13	sBzK.5860	17:57:35.34	65:17:14.39	$1.4268\pm0.0005$	A	22.96	22.35	21.31	AGN: broad MgII, [OII]
Cl 1756.14	sBzK.5699	17:57:44.06	65:16:57.11	$1.4274\pm0.0004$	A	25.89	24.20	22.71	[OII]
Cl 1756.15	pBzK.10235	17:57:25.20	65:23:58.19	$1.4277\pm0.0010$	B	>27.1	23.45	21.76	[OII]; ID63 in G09
Cl 1756.16	sBzK.4449	17:57:47.40	65:14:52.17	$1.4326\pm0.0002$	A	24.93	23.89	23.02	[OII]
Cl 1756.17	sBzK.7625	17:57:14.41	65:20:02.40	$1.4366\pm0.0001$	A	>27.1	24.46	22.95	[OII]
Cl 1756.18	AGN.1206	17:57:13.08	65:19:08.37	$1.4371\pm0.0002$	A	>27.1	>25.0	21.49	[OII]
Cl 1756.19	sBzK.7208	17:57:18.31	65:19:24.94	$1.4374\pm0.0002$	A	24.93	23.46	22.00	[OII]
Cl 1756.20	serendip.3	17:57:20.76	65:19:39.14	$1.4379\pm0.0007$	A	25.29	23.18	21.50	[OII]

Notes. ^(a) The names are composed of the selection technique for the source - AGN, sBzK or pBzK ( $\equiv$ pBzK* here) - followed by the identification number in our K-band ( $3.6~\mu$ m) catalogue for BzK (AGN) targets. Sources serendipitously identified are given a simple ``serendip.'' designation. ^(b) Q indicates the quality of the redshift, either ``A'' indicating a highly certain redshift, or ``B'' indicating a high level of confidence (see Sect. 3.2). ^(c) Magnitudes were derived using SExtractor MAG_AUTO and are therefore slightly different from the aperture magnitudes used to derive colours for candidate selection. ^(d) AGN found within $6\hbox{$^{\prime\prime}$ }$ of 7C 1756+6520. No accurate magnitude is available in K due to an artifact caused by a bright star in the near-infrared data. See Fig. 12 in G09. ^(e) pBzK* galaxy found within $3\hbox{$^{\prime\prime}$ }$ of 7C 1756+6520.

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