On the nature of red galaxies: the Chandra perspective

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Volume 501 / No 2 (July II 2009)

A&A, 501 2 (2009) 485-494

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Table 1:

Properties of the X-ray detected EROs.
ID	XID	XMM ID	RA	Dec	R	K	R- $K_{\rm S}$	HR	$F_{\rm0.5-8~keV}$	$z_{\rm phot}$
			(deg)	(deg)	(mag)	(mag)	(mag)		( ${\rm erg~cm}^{-2}~{\rm s}^{-1}$ )
4012	12	273	222.185975	8.962944	24.63	18.61	6.02	$-0.26\pm0.50$	4.00E-15	1.52
3690	20	344	222.230500	8.902914	23.36	17.81	5.55	$0.35\pm0.41$	4.19E-15	1.11
3629	23	195	222.237642	9.022706	24.11	18.33	5.78	$0.10\pm0.15$	1.53E-14	1.50
3137	48		222.299196	9.002874	24.94	18.81	6.13	<-0.09	1.00E-15	1.55
3009	51	239	222.309454	8.853264	23.96	18.24	5.72	$-0.37\pm0.22$	1.73E-14	1.08
2760	64	237	222.333292	8.986256	24.93	19.11	5.82	<-0.15	1.35E-15	1.62
2663	69		222.344513	8.866972	25.15	19.13	6.02		2.58E-15
2591	73	293	222.354121	8.941257	24.26	19.14	5.12	$0.25\pm0.30$	3.64E-15	1.69
2267	89	310	222.386204	8.872362	24.94	19.07	5.87	$-0.18\pm0.49$	4.69E-15	1.81
2160	93	209	222.396533	9.008494	23.27	18.09	5.18	$-0.39\pm0.09$	2.83E-14	1.12^a
2073	103	148	222.406892	9.055835	25.24	18.77	6.47	$-0.35\pm0.09$	3.00E-14	2.53
1777	111	250	222.435442	8.979769	23.50	18.48	5.02	>0.72	2.46E-15	1.65
1557	121		222.461171	9.084203	24.06	18.61	5.45		1.66E-15	1.13
ERO detected only in the hard band
									$F_{\rm 2-10~keV}$
3590	142		222.243017	9.051691	23.29	18.09	5.20		3.76E-15	1.07

Notes. ID and XID indicate the optical/NIR and X-ray identification number, respectively; XMM ID provides the association to the B05 catalog based on XMM-Newton observations. Coordinates are referred to the position of the associated NIR counterpart. Sources detected in the FB only have no HR entry. ^a Tentative spectroscopic redshift based on the Mg II 2798 Å emission line (see Sect. 2 for details). The photometric redshift for this source is $z_{\rm phot}=1.21$ . Only one source (ID = 2663) has no photometric redshift, because of the lack of IRAC coverage.

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