2004A&A...421..491P

Query : 2004A&A...421..491P

2004A&A...421..491P - Astronomy and Astrophysics, volume 421491-501 (2004/7-2)

The HELLAS2XMM survey. VI. X-ray absorption in the 1df AGN sample through a spectral analysis.

PEROLA G.C., PUCCETTI S., FIORE F., SACCHI N., BRUSA M., COCCHIA F., BALDI A., CARANGELO N., CILIEGI P., COMASTRI A., LA FRANCA F., MAIOLINO R., MATT G., MIGNOLI M., MOLENDI S. and VIGNALI C.

Abstract (from CDS):

The spectroscopic analysis of 117 serendipitous sources in the HELLAS2XMM 1df (1 degree field) survey is described. Of these, 106 sources, of which 86% have a spectroscopic redshift, are used to evaluate the fraction of X-ray absorbed (log NH>22) Active Galactic Nuclei (AGN) in the 2-10keV flux range 0.8-20x10–14erg/cm2/s. This fraction turns out lower than what is predicted by two well known Cosmic X-Ray Background synthesis models, and the discrepancy is significant at the 99.999% level. This result consolidates the findings recently obtained by other authors. In the flux interval explored, the data are consistent with an intrinsic distribution of the absorbing columns (flat per decade above log NH>21) independent of luminosity and redshift, together with an AGN luminosity function evolving purely in luminosity. It is shown that, on the other hand, extrapolation to lower fluxes fails to reproduce the results inferred from the Chandra Deep Field North survey. It is found that about 40% of the high luminosity sources in our sample have best fit log NH>22, and the surface density of these X-ray obscured QSOs can then be estimated at about 48 per square degree, at the flux limit of ∼10–14erg/cm2/s of the HELLAS2XMM 1df survey. As a side issue, 5 or 6 out of 60 sources, that is about 10%, identified with broad line AGN, turn out to be affected by log NH>22 absorption.

Abstract Copyright: ∼

Journal keyword(s): X-rays: diffuse background - galaxies: active - surveys

Simbad objects: 138

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Number of rows : 138
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 2XMM J000002.7-251136 Sy1 00 00 02.7070 -25 11 36.994   21.79 21.00 21   ~ 6 0
2 HELLAS2XMM J000013.7-252011 EmG 00 00 13.6 -25 20 13       23   ~ 2 0
3 ACO 2690 ClG 00 00 13.75 -25 11 11.5           ~ 29 0
4 HELLAS2XMM J000021.2-250813 Sy1 00 00 21.1827985496 -25 08 12.585200329   20.51 20.90 20.9   ~ 5 0
5 2XMM J000022.8-251222 Sy1 00 00 22.9 -25 12 22   21.05 19.70 19.7   ~ 5 0
6 HELLAS2XMM J000026.0-250648 Sy1 00 00 26.05708560 -25 06 49.8364200   21.41 20.30 20.3   ~ 6 0
7 HELLAS2XMM J000027.7-250441 Sy1 00 00 27.6852498859 -25 04 42.641217033       19.1   ~ 13 0
8 UCAC4 326-000009 * 00 00 31.9151212704 -24 54 56.418588792   17.43 16.44 17.7   ~ 16 2
9 2XMM J000034.6-250620 Sy1 00 00 34.6342368144 -25 06 21.171098304   22.07 20.30 20.3   ~ 6 0
10 2XMM J000036.6-250104 Sy2 00 00 36.6 -25 01 06     21.20 21.2   ~ 6 0
11 HELLAS2XMM J000044.3-250738 X 00 00 44.3 -25 07 38       21.6   ~ 2 0
12 GLEAM J000059-250501 Sy1 00 01 00.10 -25 05 03.6   21.8   21.86   ~ 13 1
13 2XMM J000102.4-245849 Sy1 00 01 02.4 -24 58 49   22.94   20.3   ~ 14 0
14 2XMM J000106.7-250847 Sy1 00 01 06.8 -25 08 47   23.54 21.00 21   ~ 7 0
15 [MPC2004] J000111.49-251208.7 NIR 00 01 11.49 -25 12 08.7           ~ 2 0
16 [MPC2004] J000111.50-251206.5 NIR 00 01 11.50 -25 12 06.5           ~ 5 0
17 NAME ACO 2690 29 Sy1 00 01 11.6 -25 12 03       25.1   ~ 9 0
18 2XMM J000122.6-250020 Sy1 00 01 22.6724857656 -25 00 18.850281588   19.76 18.70 18.7   ~ 11 1
19 [VV2006] J003315.7-120659 Sy1 00 33 15.6300215544 -12 06 59.017246704     19.90 19.9   ~ 10 0
20 [VV2006] J003320.6-120538 Sy1 00 33 20.6 -12 05 38     20.30 20.3   ~ 4 0
21 [VV2006] J003324.1-120649 Sy1 00 33 24.1 -12 06 49     20.20 20.2   ~ 4 0
22 HELLAS2XMM J003339.6-120826 EmG 00 33 39.6 -12 08 28       22.3   ~ 2 0
23 HELLAS2XMM J003342.5-120134 EmG 00 33 42.7 -12 01 37       22.8   ~ 2 0
24 [VV2006] J003347.5-120326 Sy1 00 33 47.5 -12 03 26     21.00 21   ~ 4 0
25 EGGR 382 PM* 00 33 54.4629362352 -12 07 58.775300904 15.511 15.572 14.891 14.467 14.051 DC? 103 0
26 [VV2006] J003357.2-120038 Sy2 00 33 57.2 -12 00 38     21.80 21.8   ~ 8 0
27 HELLAS2XMM J003410.0-121126 EmG 00 34 09.9 -12 11 32       21   ~ 2 0
28 HELLAS2XMM 15800062 Sy2 00 34 13.8 -11 56 00     23.30 23.3   ~ 6 0
29 [VV2006] J003415.5-120845 Sy1 00 34 15.5 -12 08 45     20.70 20.7   ~ 4 0
30 HELLAS2XMM 15800012 Sy2 00 34 18.5 -12 08 09     18.80 18.8   ~ 5 0
31 [VV2006] J003419.0-115939 Sy1 00 34 19.0165250574 -11 59 38.750929372     20.20 20.2   ~ 11 0
32 NAME BPM 16274 69 LIN 00 50 30.9 -52 00 48           ~ 9 0
33 [MPC2004] J005031.35-520634.2 NIR 00 50 31.35 -52 06 34.2           ~ 2 0
34 [MPC2004] J005031.51-520633.9 NIR 00 50 31.51 -52 06 33.9           ~ 2 0
35 HELLAS2XMM 03120034 Sy2 03 09 12.1 -76 58 26       19.1   ~ 9 0
36 [VV2006] J030932.1-764846 Sy1 03 09 32.1 -76 48 46     21.80 21.8   ~ 6 0
37 HELLAS2XMM 03120014 EmG 03 09 51.16 -76 58 24.7       18.4   ~ 5 0
38 HELLAS2XMM J030952.2-764927 G 03 09 52.16 -76 49 27.4       20   ~ 4 0
39 HELLAS2XMM 03120124 X 03 10 01.60 -76 51 06.7       22.5   ~ 4 0
40 [VV2006] J031015.9-765131 QSO 03 10 15.7112501304 -76 51 33.069171456     19.20 17.6   ~ 17 0
41 [MPC2004] J031017.93-765957.9 NIR 03 10 17.93 -76 59 57.9           ~ 2 0
42 [MPC2004] J031018.93-765958.4 NIR 03 10 18.93 -76 59 58.4           ~ 2 0
43 HELLAS2XMM J031019.0-765958 X 03 10 18.96 -76 59 57.9       24.4   ~ 6 0
44 HELLAS2XMM 03120028 EmG 03 10 37.36 -76 47 12.7       20.8   ~ 5 0
45 [VV2006] J031049.7-765316 QSO 03 10 49.7 -76 53 16     22.30 22.3   ~ 6 0
46 HELLAS2XMM J031050.0-763904 Sy1 03 10 50.2 -76 39 04       18.6   ~ 9 0
47 HELLAS2XMM 03120009 Sy1 03 11 05.3 -76 51 58       23.2   ~ 8 0
48 HELLAS2XMM 03120011 Sy1 03 11 13.3 -76 47 02       21.5   ~ 7 0
49 HELLAS2XMM 03120029 X 03 11 13.36 -76 54 31.1       18.8   ~ 4 0
50 [MPC2004] J031113.65-765359.6 NIR 03 11 13.65 -76 53 59.6           ~ 2 0
51 HELLAS2XMM 03120031 X 03 11 13.86 -76 53 59.1       23.6   ~ 5 0
52 2MASS J03112533-7701345 BLL 03 11 25.3282043352 -77 01 34.335586668     17.70 17.7   ~ 12 0
53 HELLAS2XMM 03120066 Sy1 03 11 29.2 -76 45 15       23.1   ~ 6 0
54 HELLAS2XMM 03120035 Sy1 03 11 31.8 -77 00 32       22.0   ~ 6 0
55 HELLAS2XMM J031136.0-765556 EmG 03 11 35.96 -76 55 55.8       23.2   ~ 4 0
56 HELLAS2XMM J031145.0-765645 EmG 03 11 44.4 -76 56 46       23.6   ~ 2 0
57 QSO J0311-7651 BLL 03 11 55.2496997640 -76 51 50.848335324 15.27 16.09 16.10 15.33   ~ 231 1
58 HELLAS2XMM 03120016 Sy2 03 12 00.4 -77 00 26       22.2   ~ 5 0
59 [VV2006] J031209.2-765213 QSO 03 12 08.9563692984 -76 52 13.343579796     18.70 18.2   ~ 10 0
60 2MASX J03123142-7643242 G 03 12 31.426 -76 43 24.20       13.7   ~ 14 0
61 2MASS J03123866-7651335 AGN 03 12 38.7229128480 -76 51 33.137144424       18   ~ 19 0
62 HELLAS2XMM J031252.2-770059 X 03 12 52.16 -77 00 59.5       24   ~ 3 0
63 CXOU J031253.8-765415 Sy2 03 12 53.8 -76 54 15       22   ~ 10 0
64 HELLAS2XMM J031258.0-765120 Sy1 03 12 57.9 -76 51 20       23.5   ~ 6 0
65 [VV2006] J031312.1-765432 QSO 03 13 11.8952172096 -76 54 30.394993320     19.10 19.1   ~ 10 0
66 HELLAS2XMM 03120003 Sy1 03 13 14.5 -76 55 57       18.3   ~ 9 0
67 [VV2006] J031334.5-764830 QSO 03 13 34.5932125200 -76 48 29.500970760     19.70 19.7   ~ 7 0
68 [MPC2004] J031342.68-765426.7 NIR 03 13 42.68 -76 54 26.7           ~ 2 0
69 [MPC2004] J031342.90-765423.9 NIR 03 13 42.90 -76 54 23.9           ~ 2 0
70 HELLAS2XMM J031343.5-765426 X 03 13 43.55 -76 54 26.3       24.6   ~ 6 0
71 [MPC2004] J031343.76-765419.6 NIR 03 13 43.76 -76 54 19.6           ~ 2 0
72 [VV2006] J031349.3-764600 Sy1 03 13 49.3 -76 46 00     21.60 21.6   ~ 6 0
73 HELLAS2XMM 03120010 Sy1 03 14 16.5 -76 45 36       19.6   ~ 7 0
74 HELLAS2XMM 03120020 EmG 03 14 16.76 -76 55 59.5       21.5   ~ 4 0
75 HELLAS2XMM 03120012 Sy1 03 15 28.8 -76 53 40       21   ~ 6 0
76 HELLAS2XMM 05370020 Sy1 05 38 50.9 -28 37 58     20.70 20.7   ~ 5 0
77 HELLAS2XMM 05370123 Sy1 05 38 51.5 -28 39 49     23.10 23.1   ~ 7 0
78 HELLAS2XMM 05370005 Sy1 05 39 05.5 -28 33 16     21.10 21.1   ~ 4 0
79 HELLAS2XMM 05370016 Sy2 05 39 09.4 -28 41 45     21.70 21.7   ~ 6 0
80 HELLAS2XMM 05370009 Sy1 05 39 10.8 -28 35 26     20.80 20.8   ~ 5 0
81 [MPC2004] J053911.35-283716.7 NIR 05 39 11.35 -28 37 16.7           ~ 2 0
82 HELLAS2XMM J053911.5-283717 X 05 39 11.5 -28 37 18       24.5   ~ 5 0
83 [MPC2004] J053911.60-283715.1 NIR 05 39 11.60 -28 37 15.1           ~ 3 0
84 [VV2006] J053920.1-283638 Sy1 05 39 20.1113859240 -28 36 37.501639992     21.00 21   ~ 5 0
85 HELLAS2XMM J053920.5-283722 Sy2 05 39 20.5 -28 37 21     23.40 23.4   ~ 6 0
86 HELLAS2XMM J053921.6-283804 X 05 39 21.6 -28 38 04       21.7   ~ 2 0
87 QSO B0537-2843 QSO 05 39 23.4962542440 -28 42 22.888252440     17.0 16.6   ~ 12 0
88 HELLAS2XMM J053925.3-283237 X 05 39 25.3 -28 32 37       22.4   ~ 2 0
89 HELLAS2XMM J053925.8-284456 G 05 39 25.8 -28 44 56       21   ~ 3 0
90 HELLAS2XMM 05370003 Sy1 05 39 29.4 -28 49 00     18.10 18.1   ~ 5 0
91 HELLAS2XMM J053933.6-283519 X 05 39 33.6 -28 35 19       23.9   ~ 2 0
92 HELLAS2XMM 05370078 Sy1 05 39 38.7 -28 48 08     22.00 22.0   ~ 4 0
93 [VV2006] J053939.2-285251 Sy1 05 39 39.2 -28 52 51     20.60 20.6   ~ 4 0
94 [VV2006] J053939.8-283142 Sy1 05 39 39.8 -28 31 42     20.40 20.4   ~ 4 0
95 [VV2006] J053943.1-282719 Sy1 05 39 43.1 -28 27 19     19.60 19.6   ~ 5 0
96 [MPC2004] J053945.22-284909.8 NIR 05 39 45.22 -28 49 09.8           ~ 2 0
97 HELLAS2XMM J053945.3-284910 X 05 39 45.3 -28 49 11       25.0   ~ 5 0
98 [VV2006] J053950.0-283832 Sy1 05 39 49.9724344008 -28 38 32.089767396     18.00 18.0   ~ 5 0
99 [VV2006] J053950.4-283345 Sy1 05 39 50.4 -28 33 45     21.50 21.5   ~ 4 0
100 HELLAS2XMM J053951.9-283345 X 05 39 51.9 -28 33 45       23.7   ~ 2 0
101 HELLAS2XMM J053952.7-284709 X 05 39 52.7 -28 47 09       22.5   ~ 2 0
102 QSO B0537-286 Bla 05 39 54.28147904 -28 39 55.9481236   19.70 20.0 18.789   ~ 314 1
103 HELLAS2XMM J053956.1-284622 X 05 39 56.1 -28 46 22       24.6   ~ 2 0
104 HELLAS2XMM J053957.0-285028 Sy1 05 39 56.7 -28 50 27     20.70 20.7   ~ 4 0
105 HELLAS2XMM 05370013 Sy1 05 39 57.0 -28 51 08     22.00 22   ~ 4 0
106 [VV2006] J053957.2-284914 Sy1 05 39 57.2 -28 49 14     21.60 21.6   ~ 4 0
107 HELLAS2XMM J053958.6-284126 X 05 39 58.6 -28 41 26       24.5   ~ 2 0
108 HELLAS2XMM J053958.7-283707 Sy1 05 39 58.7 -28 37 08     22.80 22.8   ~ 4 0
109 HELLAS2XMM J053958.8-284919 X 05 39 58.8 -28 49 19       21.5   ~ 2 0
110 HELLAS2XMM J053959.0-283753 Sy1 05 39 59.0 -28 37 53     20.60 20.6   ~ 5 0
111 [VV2006] J054000.8-283456 Sy1 05 40 00.8 -28 34 56     20.50 20.5   ~ 4 0
112 HELLAS2XMM J054004.4-283814 X 05 40 04.4 -28 38 14       24   ~ 2 0
113 [VV2006] J054010.5-284053 Sy1 05 40 10.5 -28 40 53     20.30 20.3   ~ 4 0
114 HELLAS2XMM J054013.0-284402 X 05 40 13.0 -28 44 02       21.6   ~ 2 0
115 [MPC2004] J054021.13-285037.6 NIR 05 40 21.13 -28 50 37.6           ~ 2 0
116 HELLAS2XMM J054021.2-285038 X 05 40 21.2 -28 50 38       23.7   ~ 5 0
117 HELLAS2XMM 05370043 Sy2 05 40 22.1 -28 31 40     22.70 22.7   ~ 8 0
118 HELLAS2XMM 05370135 Sy2 05 40 24.6 -28 46 16     21.30 21.3   ~ 5 0
119 HELLAS2XMM J054026.1-285039 EmG 05 40 26.3 -28 50 42       23.5   ~ 2 0
120 HELLAS2XMM 05370008 Sy2 05 40 34.2 -28 31 08       19   ~ 4 0
121 [VV2006] J054045.7-283908 Sy1 05 40 45.7277236968 -28 39 07.830030096     19.80 19.8   ~ 7 0
122 HELLAS2XMM J054051.3-283642 X 05 40 51.3 -28 36 42       23.0   ~ 2 0
123 [VV2006] J054054.0-284347 Sy1 05 40 54.0 -28 43 47     19.90 19.9   ~ 4 0
124 HELLAS2XMM J054100.4-283905 X 05 41 00.4 -28 39 05       21.5   ~ 3 0
125 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3938 2
126 HELLAS2XMM 50900039 Sy1 20 43 22.5 -10 40 31     22.40 22.4   ~ 4 0
127 HELLAS2XMM 50900031 Sy1 20 43 49.1 -10 37 43     20.60 20.6   ~ 5 0
128 HELLAS2XMM 50900013 Sy2 20 43 49.5 -10 32 40     23.20 23.2   ~ 7 0
129 HELLAS2XMM 50900067 Sy1 20 44 07.2 -10 56 12     22.30 22.3   ~ 4 0
130 Mrk 509 Sy1 20 44 09.7504483224 -10 43 24.727155528   13.35 13.12 10.7   ~ 1370 0
131 2XMM J204419.5-105619 Sy1 20 44 19.5 -10 56 19     20.20 20.2   ~ 5 0
132 HELLAS2XMM J204420.5-104904 G 20 44 20.5 -10 49 04       20.4   ~ 3 0
133 HELLAS2XMM 50900001 Sy2 20 44 28.4 -10 56 33     23.90 23.9   ~ 6 0
134 HELLAS2XMM 50900036 Sy2 20 44 46.7 -10 38 43     20.20 20.2   ~ 5 0
135 2XMM J235933.3-250757 Sy1 23 59 33.3 -25 07 57   21.61 21.80 21.8   ~ 6 0
136 2XMM J235939.8-250056 Sy1 23 59 39.7942230840 -25 00 56.762544420   21.58 19.60 19.6   ~ 6 0
137 NAME ACO 2690 75 Sy2 23 59 56.6 -25 10 20       24.6   ~ 10 0
138 HELLAS2XMM 26000038 G ~ ~           ~ 1 0

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