2018MNRAS.473.2378V

Query : 2018MNRAS.473.2378V

2018MNRAS.473.2378V - Mon. Not. R. Astron. Soc., 473, 2378-2406 (2018)

High-redshift agn in the Chandra Deep Fields: the obscured fraction and space density of the sub-L_* population.

VITO F., BRANDT W.N., YANG G., GILLI R., LUO B., VIGNALI C., XUE Y.Q., COMASTRI A., KOEKEMOER A.M., LEHMER B.D., LIU T., PAOLILLO M., RANALLI P., SCHNEIDER D.P., SHEMMER O., VOLONTERI M. and WANG J.

Abstract (from CDS):

We investigate the population of high-redshift (3 <= z < 6) active galactic nuclei (AGN) selected in the two deepest X-ray surveys, the 7 Ms Chandra Deep Field-South and 2 Ms Chandra Deep Field-North. Their outstanding sensitivity and spectral characterization of faint sources allow us to focus on the sub-L_* regime (logL_X <= 44), poorly sampled by previous works using shallower data, and the obscured population. Taking fully into account the individual photometric-redshift probability distribution functions, the final sample consists of ≃102 X-ray-selected AGN at 3 <= z < 6. The fraction of AGN obscured by column densities logN_H > 23 is ∼0.6-0.8, once incompleteness effects are taken into account, with no strong dependence on redshift or luminosity. We derived the high-redshift AGN number counts down to F_0.5-2 keV_ = 7 x 10^–18 erg cm^–2 s^–1, extending previous results to fainter fluxes, especially at z > 4. We put the tightest constraints to date on the low-luminosity end of AGN luminosity function at high redshift. The space density, in particular, declines at z > 3 at all luminosities, with only a marginally steeper slope for low-luminosity AGN. By comparing the evolution of the AGN and galaxy densities, we suggest that such a decline at high luminosities is mainly driven by the underlying galaxy population, while at low luminosities there are hints of an intrinsic evolution of the parameters driving nuclear activity. Also, the black hole accretion rate density and star formation rate density, which are usually found to evolve similarly at z <= 3, appear to diverge at higher redshifts.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - surveys - galaxies: active - galaxies: evolution - galaxies: high-redshift - X-rays: galaxies

Simbad objects: 123

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Number of rows : 123

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	[LBX2017] 8	AGN	03 31 44.275	-27 49 25.51		28.14	27.60	23.2	25.62	~	18	0
2	[LBX2017] 9	AGN	03 31 44.691	-27 51 56.16		28.17	27.67	25.3	25.84	~	18	0
3	[SBH2004] XID 591	AGN	03 31 44.940	-27 51 38.25		28.15	27.67		25.79	~	17	0
4	VCDFS 69258	AGN	03 31 45.17	-27 49 49.9		24.2725	23.6323	23.5215	23.5008	~	8	0
5	[LBA2005] 179	AGN	03 31 49.047	-27 52 21.38						~	9	0
6	[LBX2017] 29	AGN	03 31 49.882	-27 49 40.58						~	3	0
7	[LBX2017] 35	AGN	03 31 50.589	-27 53 00.87		28.14	27.70	24.4	25.78	~	18	0
8	ZFOURGE CDFS 17303	AGN	03 31 53.88713	-27 47 16.1934		22.004		23.958		~	7	0
9	[LBX2017] 84	AGN	03 31 59.072	-27 51 21.39		28.23	27.74		25.86	~	8	0
10	[ABB2003] CDFS 33	AGN	03 31 59.707	-27 49 47.48			25.99			~	19	0
11	[LBX2017] 99	AGN	03 32 01.449	-27 55 06.97						~	3	0
12	[LBX2017] 101	AGN	03 32 01.558	-27 44 02.88		28.149	27.75		27.859	~	17	0
13	CXOCDFS J033202.6-274430	AGN	03 32 02.57	-27 44 30.0		27.98	26.97		26.684	~	35	0
14	VANDELS CDFS 220795	AGN	03 32 02.7173	-27 49 44.415				26.78		~	8	0
15	GEMS J033204.00-274441.3	AGN	03 32 03.984	-27 44 41.45		28.21		26.56	25.5254	~	29	0
16	[LBX2017] 126	AGN	03 32 04.28	-27 40 26.2		28.32		25.93		~	23	0
17	[VV2006] J033205.0-274432	QSO	03 32 04.938	-27 44 31.73		23.922	23.84	24.899	23.7075	~	32	0
18	CXOCDFS J033207.5-274943	rG	03 32 07.3544	-27 49 41.974		27.061		25.46	25.095	~	29	0
19	[GFG2013b] 12178	AGN	03 32 09.414	-27 47 57.79				25.79		~	8	0
20	CXOCDFS J033209.5-274754	AGN	03 32 09.59	-27 47 54.8		28.540			26.216	~	17	0
21	[LBX2017] 214	AGN	03 32 11.382	-27 52 13.45				26.8		~	42	0
22	ZFOURGE CDFS 21847	AGN	03 32 12.087	-27 45 07.98					26.139	~	12	0
23	ATCDFS9 J033213.04-274351.5	rG	03 32 13.08	-27 43 51.0						~	23	0
24	ALESS J033213.85-275600.3	rG	03 32 13.846	-27 56 00.09	27.86	28.22	27.73	25.6	25.90	~	57	0
25	CXOCDFS J033215.4-275038	rG	03 32 15.306	-27 50 36.71		25.872	27.28		23.627	~	25	0
26	CANDELS GDS F160W J033216.85-275043.9	AGN	03 32 16.86	-27 50 44.2		25.37		27.30	25.164	~	32	0
27	ZFOURGE CDFS 7932	AGN	03 32 18.348	-27 51 50.49		29.495			27.048	~	11	0
28	CXOCDFS J033218.9-275136	Sy2	03 32 18.8321	-27 51 35.476		25.15		24.51	25.128	~	83	0
29	GOODS-MUSIC 16499	AGN	03 32 19.553	-27 42 05.30		26.13	26.22			~	11	0
30	ZFOURGE CDFS 7732	AGN	03 32 19.836	-27 51 59.44		28.20	27.67		25.82	~	22	0
31	[GZW2002] Main 133	AGN	03 32 20.357	-27 42 29.02		28.56	28.86		25.82	~	33	0
32	GOODS-MUSIC 70390	AGN	03 32 20.4900	-27 51 29.178		28.1096			25.401	~	17	0
33	ZFOURGE CDFS 10713	AGN	03 32 23.18	-27 50 29.1				26.52		~	10	0
34	EIS-DEEP CDFS-3 J 1 1467	AGN	03 32 23.3376	-27 51 56.870		26.0596		23.42	23.4515	~	36	0
35	BBG 4550	AGN	03 32 24.624	-27 51 37.82		28.774	27.35		26.004	~	22	0
36	ZFOURGE CDFS 24336	AGN	03 32 25.62	-27 43 55.6						~	8	0
37	ZFOURGE CDFS 30738	AGN	03 32 25.8224	-27 39 12.049						~	7	0
38	CXOCDFS J033225.9-275508	AGN	03 32 25.8597	-27 55 06.400		24.086	23.728	23.718	22.801	~	31	0
39	VANDELS CDFS 004581	AGN	03 32 26.12	-27 52 06.8						~	12	0
40	[LBX2017] 490	AGN	03 32 26.7783	-27 46 03.991		28.9513			27.239	~	48	0
41	ZFOURGE CDFS 24953	AGN	03 32 27.2983	-27 43 33.194				26.06		~	9	0
42	ZFOURGE CDFS 9087	AGN	03 32 27.4036	-27 51 16.220						~	9	0
43	NAME GOODS Southern Field	reg	03 32 28.0	-27 48 30						~	1623	1
44	NAME Chandra Deep Field-South	reg	03 32 28.0	-27 48 30						~	2282	1
45	[SWM2014] GOODS-S 37542	AGN	03 32 28.285	-27 44 03.45		24.631	24.49	23.050	22.925	~	34	0
46	CXOCDFS J033228.4-275305	AGN	03 32 28.467	-27 53 05.30		27.327			25.756	~	14	0
47	GOODS-MUSIC 70099	rG	03 32 28.78	-27 44 35.2						~	20	0
48	ALESS J033229.29-275619.7	Sy1	03 32 29.2912	-27 56 19.465			26.76	25.82	25.1655	~	122	0
49	[VV2006] J033229.9-275106	Sy2	03 32 29.8487	-27 51 05.879		27.5675	25.05	23.970	24.5370	~	101	0
50	NAME Extended Chandra Deep Field South	reg	03 32 30.0	-27 48 20						~	862	0
51	GOODS-MUSIC 70220	AGN	03 32 31.309	-27 47 28.04		30.2961	27.72		27.026	~	18	0
52	CXOCDFS J033233.2-275206	AGN	03 32 33.113	-27 52 05.47		28.63	28.82		28.550	~	32	0
53	CXOCDFS J033233.2-274916	AGN	03 32 33.25	-27 49 16.3		27.628		26.16	25.300	~	19	0
54	GOODS J033233.42-275326.3	AGN	03 32 33.42	-27 53 26.6						~	12	0
55	ATCDFS J033233.44-275228.0	rG	03 32 33.446	-27 52 28.55		31.457	27.72		27.963	~	41	0
56	MUSE-WIDE 123005089	rG	03 32 34.27	-27 49 40.3		26.786		26.01	25.086	~	21	0
57	CXOU J033235.1-275215	AGN	03 32 35.19	-27 52 15.7		30.517	28.52		31.665	~	30	0
58	ZFOURGE CDFS 8395	AGN	03 32 35.5344	-27 51 42.738						~	8	0
59	ZFOURGE CDFS 10831	AGN	03 32 36.7428	-27 50 26.019						~	8	0
60	CXOCDFS J033238.1-274401	rG	03 32 38.000	-27 44 01.00		28.60	27.92		27.023	~	42	0
61	CXOCDFS J033238.8-275122	AGN	03 32 38.7610	-27 51 21.621		27.7247		27.02	26.1466	~	45	0
62	NAME Hubble Ultra Deep Field	reg	03 32 39.0	-27 47 29						~	1900	0
63	ACS-GC 90045073	Sy2	03 32 39.670	-27 48 50.60		27.3148		25.18	24.512	~	108	0
64	GOODS-MUSIC 11670	EmG	03 32 40.785	-27 46 06.02		25.6088	24.960	25.33		~	34	0
65	ATCDFS J033240.82-275545.8	Sy2	03 32 40.83	-27 55 46.6		26.87	26.153	25.42	25.4033	~	64	0
66	[VV2006] J033241.9-275203	QSO	03 32 41.84	-27 52 02.3		24.3501	23.03	22.529	22.4031	~	68	1
67	CXOCDFS J033242.9-274703	Sy1	03 32 42.837	-27 47 02.53		25.6384	24.571	24.100	24.311	~	81	0
68	[VV2006] J033244.4-275252	QSO	03 32 44.28	-27 52 51.0		25.0168		23.904	23.8566	~	51	0
69	GOODS J033247.62-275538.7	AGN	03 32 47.6230	-27 55 38.745						~	8	0
70	ZFOURGE CDFS 10343	rG	03 32 48.408	-27 50 39.33		34.724			28.962	~	10	0
71	VANDELS CDFS 018969	AGN	03 32 49.93	-27 45 00.0				26.10	25.077	~	16	0
72	[FPG2012] M3320	QSO	03 32 50.24688	-27 52 51.9384		26.5873	25.63		24.8575	~	41	0
73	CXOCDFS J033251.8-275214	AGN	03 32 51.644	-27 52 12.94		28.350	28.00		27.311	~	37	0
74	GOODS J033253.84-274927.7	AGN	03 32 53.841	-27 49 27.57						~	10	0
75	VANDELS CDFS 208860	AGN	03 32 55.1678	-27 55 06.068				25.94		~	9	0
76	[LBX2017] 921	AGN	03 32 57.61	-27 45 48.2		22.863		24.876		~	29	0
77	[LBX2017] 926	AGN	03 32 58.600	-27 46 33.02			24.906	23.250		~	20	0
78	[XLB2011] J033259.96-275144.3	AGN	03 32 59.863	-27 51 42.84						~	4	0
79	[LBX2017] 940	AGN	03 33 00.016	-27 49 25.56		26.09	25.75	25.27	25.46	~	19	0
80	[LBX2017] 962	AGN	03 33 03.734	-27 47 29.45						~	7	0
81	[LBX2017] 965	AGN	03 33 04.162	-27 48 57.47		27.69	28.56	27.09	26.84	~	7	0
82	[LBX2017] 971	AGN	03 33 05.904	-27 46 50.46		28.15	28.52	27.73	25.10	~	24	0
83	[LBX2017] 974	AGN	03 33 07.051	-27 46 03.82						~	10	0
84	[LBX2017] 990	AGN	03 33 10.94	-27 47 34.9				26.50		~	7	0
85	CXOHDFN J123539.2+621311	X	12 35 39.51	+62 13 11.0		27.3	28.3	29.5	28.0	~	9	0
86	[VV2006] J123600.5+621925	QSO	12 36 00.40	+62 19 25.4	24.5	24.2	23.7	23.6	23.5	~	11	0
87	NAME SMM J123608+621431	rG	12 36 08.60	+62 14 35.4	27.7	26.7	26.9	26.1	26.8	~	22	0
88	[VV2006] J123612.9+621929	QSO	12 36 12.96	+62 19 28.6	26.3	24.6	22.80	23.0	22.9	~	10	0
89	CXOHDFN J123614.1+621017	G	12 36 14.1389	+62 10 17.489		29.2	28.5	29.1		~	14	0
90	CXOHDFN J123615.8+621515	rG	12 36 15.84	+62 15 15.6	28.5	28.8	26.6	27.2	26.3	~	23	0
91	[MOD2010] 498	Rad	12 36 19.88	+62 19 10.2						~	4	0
92	CXOHDFN J123623.6+621009	G	12 36 23.6973	+62 10 09.095	29.8		27.7	27.5	26.5	~	17	0
93	AzGN 10	rG	12 36 27.56	+62 12 18.0	27.7	28.7	27.1		27.10	~	26	0
94	[O2018] J123627.7+621158	X	12 36 27.78	+62 11 58.6						~	4	0
95	MODS wide 2039	G	12 36 28.8185	+62 11 40.074	29.0		28.5		29.4	~	11	0
96	[VV2006] J123629.4+621513	QSO	12 36 29.44	+62 15 13.1	28.23	25.9205	24.87	24.0	23.8864	~	25	0
97	CXOHDFN J123633.3+621408	rG	12 36 33.42	+62 14 08.7						~	11	0
98	CXOHDFN J123633.4+621418	Sy1	12 36 33.51	+62 14 18.2	27.8	26.3420	25.42	23.91	25.0475	~	29	0
99	CXOHDFN J123636.8+621320	rG	12 36 36.92	+62 13 20.3	30.0	27.9	28.6	28.3	26.49	~	26	0
100	COLDz -cont-GN-10	rG	12 36 42.093	+62 13 31.29	26.61	27.03	26.43	25.8	25.7254	~	75	0
101	CXOHDFN J123642.3+620612	G	12 36 42.22	+62 06 12.6		27.4	27.1	25.71	25.2	~	12	0
102	MODS deep 88	rG	12 36 43.16	+62 11 08.8	24.78	25.51	24.36			~	10	0
103	CXOHDFN J123645.1+621106	EmG	12 36 45.1623	+62 11 06.747			27.1			~	10	0
104	[ABB2003] CDFN 236	X	12 36 45.70	+62 14 48.3	25.8	25.5	25.6	25.53	25.4	~	6	0
105	GOODS J123646.06+621448.8	rG	12 36 46.060	+62 14 48.70			27.5			~	17	0
106	[VV2006] J123647.9+620940	QSO	12 36 47.95	+62 09 41.5	25.74	25.0	26.2	24.0	23.8871	~	38	0
107	NAME Chandra Deep Field-North	reg	12 36.8	+62 13						~	686	0
108	GOODS J123652.85+621637.1	G	12 36 52.9032	+62 16 37.019			27.7			~	6	0
109	CXOHDFN J123653.9+621503	G	12 36 53.9616	+62 15 04.131						~	6	0
110	NAME GOODS-N Field	reg	12 36 55.0	+62 14 15						~	1364	1
111	[ABB2003] CDFN 289	X	12 36 56.43	+62 23 56.6	26.8	24.7	24.3	24.1	24.1	~	5	0
112	CXOHDFN J123656.5+621513	rG	12 36 56.58	+62 15 13.0		26.7	28.1	27.0	26.20	~	20	0
113	GOODS J123657.93+622128.7	QSO	12 36 57.93	+62 21 28.7						~	5	0
114	CXOHDFN J123701.7+620720	G	12 37 01.59	+62 07 20.7	30.0		27.8	27.9	30.2	~	11	0
115	CXOHDFN J123702.3+621925	AG?	12 37 02.43	+62 19 26.1	26.4	28.4572	27.1	25.5	26.9252	~	15	0
116	CXO J123703.9+621156	Sy2	12 37 03.98	+62 11 57.4		26.7083	25.58	25.1	25.1251	~	27	0
117	NAME SMM J123713.9+621827	rG	12 37 13.86	+62 18 26.2			27.4	27.3	26.5	~	36	1
118	CXOHDFN J123714.3+621208	EmG	12 37 14.28	+62 12 08.5	24.90	24.7591	24.73	24.0	23.9225	~	32	0
119	GOODS J123714.69+621839.4	EmG	12 37 14.6822	+62 18 39.417			26.0	25.76		~	10	0
120	[XLB2016] CDFN 509	X	12 37 15.76	+62 08 08.1						~	3	0
121	CXOHDFN J123719.0+621025	SyG	12 37 18.98	+62 10 25.8		27.9	27.54	25.6	26.4494	~	19	0
122	[VV2006] J123723.7+622113	QSO	12 37 23.74	+62 21 12.9	26.97	25.1744	24.41	23.8	23.6336	~	24	0
123	ACS-GC 50004272	AGN	12 37 31.656	+62 17 04.16	27.4	27.2	26.5	24.05	23.7	~	15	0

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