CDS

2007A&A...467...73T

Query : 2007A&A...467...73T

2007A&A...467...73T - Astronomy and Astrophysics, volume 467, 73-91 (2007/5-3)

Obscured and unobscured AGN populations in a hard-X-ray selected sample of the XMDS survey.

TAJER M., POLLETTA M., CHIAPPETTI L., MARASCHI L., TRINCHIERI G., MACCAGNI D., ANDREON S., GARCET O., SURDEJ J., PIERRE M., LE FEVRE O., FRANCESCHINI A., LONSDALE C.J., SURACE J.A., SHUPE D.L., FANG F., ROWAN-ROBINSON M., SMITH H.E. and TRESSE L.

Abstract (from CDS):

Our goal is to probe the populations of obscured and unobscured AGN investigating their optical-IR and X-ray properties as a function of X-ray flux, luminosity and redshift within a hard X-ray selected sample with wide multiwavelength coverage. We selected a sample of 136 X-ray sources detected at a significance of ≥3σ in the 2-10keV band (F2–10>10–14erg/cm2/s) in a ∼1deg2 area in the XMM Medium Deep Survey (XMDS). The XMDS area is covered with optical photometry from the VVDS and CFHTLS surveys and infrared Spitzer data from the SWIRE survey. Based on the X-ray luminosity and X-ray to optical ratio, 132 sources are likely AGN, of which 122 have unambiguous optical - IR identification. The observed optical and IR spectral energy distributions of all identified sources are fitted with AGN/galaxy templates in order to classify them and compute photometric redshifts. X-ray spectral analysis is performed individually for sources with a sufficient number of counts and using a stacking technique for subsamples of sources at different flux levels. Hardness ratios are used to estimate X-ray absorption in individual weak sources. 70% of the AGN are fitted by a type 2 AGN or a star forming galaxy template. We group them together in a single class of ``optically obscured'' AGN. These have ``red'' optical colors and in about 60% of cases show significant X-ray absorption (NH>1022cm–2). Sources with SEDs typical of type 1 AGN have ``blue'' optical colors and exhibit X-ray absorption in about 30% of cases. The stacked X-ray spectrum of obscured AGN is flatter than that of type 1 AGN and has an average spectral slope of Γ=1.6. The subsample of objects fitted by a star forming galaxy template has an even harder stacked spectrum, with Γ∼1.2-1.3. The obscured fraction is larger at lower fluxes, lower redshifts and lower luminosities. X-ray absorption is less common than ``optical'' obscuration and its incidence is nearly constant with redshift and luminosity. This implies that at high luminosities X-ray absorption is not necessarily related to optical obscuration. The estimated surface densities of obscured, unobscured AGN and type 2 QSOs are respectively 138, 59 and 35deg–2 at F>10–14erg/cm2/s.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/467/73): tablea1.dat>

Nomenclature: Table A1: XMDS JHHMMSS.s+DDMMSS N=136 = XMDS NNNN N=136 among (Nos 4-1265).

Simbad objects: 139

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Number of rows : 139
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 2XMM J021642.3-043552 QSO 02 16 42.4 -04 35 52       24.46   ~ 14 0
2 SDSS J022317.43-044032.8 QSO 02 23 17.4404635344 -04 40 32.854219572   18.81   18.0 18.23 ~ 18 0
3 2XLSSd J022317.9-045524 AGN 02 23 18.02 -04 55 26.0   24.22     22.65 ~ 3 0
4 SDSS J022319.03-044614.2 QSO 02 23 19.035 -04 46 14.24   21.23     20.76 ~ 12 0
5 2XLSSd J022319.5-044731 Sy1 02 23 19.6254414600 -04 47 31.040429100   21.18   19.284 18.48 ~ 20 0
6 2XLSSd J022321.9-045738 QSO 02 23 22.002 -04 57 38.57   22.04     19.46 ~ 13 0
7 2XLSSd J022325.4-040922 AGN 02 23 25.52 -04 09 20.7   22.55     21.50 ~ 3 0
8 XMDS J022326.0-043534 X 02 23 25.969 -04 35 35.29   25.00     22.33 ~ 2 0
9 SDSS J022326.46-045706.1 QSO 02 23 26.4621522624 -04 57 06.154586244   20.98   20.994 20.48 ~ 19 0
10 SDSS J022329.26-045451.9 QSO 02 23 29.2730815632 -04 54 52.017066468   20.44   20.42 19.92 ~ 19 0
11 SDSS J022330.15-043004.2 QSO 02 23 30.155 -04 30 04.28   20.63   20.0 19.94 ~ 17 0
12 2XLSSd J022330.7-044632 AGN 02 23 30.79 -04 46 32.7   24.57     23.37 ~ 4 0
13 XMDS J022330.9-044235 AGN 02 23 31.149 -04 42 33.04           ~ 3 0
14 SDSS J022332.15-045739.5 QSO 02 23 32.1534082800 -04 57 39.602982132   20.32     19.62 ~ 9 0
15 2XLSSd J022332.9-041526 AGN 02 23 33.10 -04 15 23.9   25.72     23.50 ~ 4 0
16 2XMM J022333.1-044922 QSO 02 23 33.2481110064 -04 49 22.819087668   20.66   20.6 20.26 ~ 8 0
17 SDSS J022342.13-043534.6 QSO 02 23 42.1417137648 -04 35 34.584683496   21.41     20.70 ~ 13 0
18 2XLSSd J022343.6-044105 AGN 02 23 43.62 -04 41 05.0           ~ 3 0
19 XMDS J022344.4-045120 AGN 02 23 44.634 -04 51 18.22   22.36     21.50 ~ 3 0
20 SDSS J022350.72-042703.8 QSO 02 23 50.722 -04 27 03.85   21.74     21.40 ~ 10 0
21 SDSS J022350.77-043158.3 QSO 02 23 50.7820976256 -04 31 58.288397700   19.99   19.394 19.23 ~ 14 0
22 2XMM J022351.2-042053 EmG 02 23 51.2623324344 -04 20 53.470577508   20.35   19.635 19.11 ~ 9 0
23 SDSS J022353.86-045508.2 QSO 02 23 53.864 -04 55 08.23   22.29     21.43 ~ 16 0
24 2MASS J02235471-0448150 QSO 02 23 54.8157923472 -04 48 15.096264120   18.25   18.163 18.01 ~ 23 0
25 SDSS J022356.68-041106.2 QSO 02 23 56.688 -04 11 06.24   22.31     21.53 ~ 15 0
26 XMDS J022356.8-043115 X 02 23 56.802 -04 31 15.14   24.50     22.79 ~ 3 0
27 MCG-01-07-007 IG 02 24 02.6535882792 -04 41 36.266806284   14.91   13.86 13.54 ~ 30 0
28 SDSS J022404.05-045118.2 QSO 02 24 04.050 -04 51 18.28   22.70     20.95 ~ 16 0
29 2XLSSd J022406.3-041831 AGN 02 24 06.52 -04 18 31.0   25.90     22.75 ~ 4 0
30 WISE J022408.43-041153.1 X 02 24 08.469 -04 11 50.60           ~ 2 0
31 SDSS J022415.76-041416.8 QSO 02 24 15.766 -04 14 16.83   21.53     20.65 ~ 16 0
32 VIDEO J022418.00-040606.63 AGN 02 24 18.00 -04 06 06.6   23.84     23.01 ~ 3 0
33 XMDS J022421.2-040351 X 02 24 21.265 -04 03 52.49   24.50     21.34 ~ 3 0
34 SDSS J022421.41-040609.7 AGN 02 24 21.4125409248 -04 06 09.699254604   21.26     19.39 ~ 7 0
35 SDSS J022424.16-043229.9 QSO 02 24 24.1769338176 -04 32 29.983151184   18.97   18.914 18.65 ~ 20 0
36 SDSS J022432.47-043037.3 QSO 02 24 32.4722401224 -04 30 37.268666460   20.80     19.91 ~ 12 0
37 XMDS J022436.2-042511 AGN 02 24 36.239 -04 25 10.82   25.35     23.31 ~ 4 0
38 VIDEO J022437.96-041519.34 G 02 24 37.97 -04 15 19.3   24.10     22.31 ~ 4 0
39 2MASS J02243899-0427065 QSO 02 24 38.9738089008 -04 27 06.312895740   18.87   17.09 17.40 ~ 29 0
40 SDSS J022439.73-042401.6 QSO 02 24 39.7358935272 -04 24 01.600946280   20.94   19.8 19.27 ~ 23 0
41 SDSS J022447.49-041051.2 QSO 02 24 47.498 -04 10 51.27   21.41     21.16 ~ 10 0
42 SDSS J022449.24-041802.1 QSO 02 24 49.244 -04 18 02.13   21.72     20.39 ~ 14 0
43 VIDEO J022449.30-040842.76 AGN 02 24 49.30 -04 08 42.8   22.18     21.17 ~ 4 0
44 SDSS J022449.86-043025.9 QSO 02 24 49.8672037104 -04 30 25.938221004   20.42   19.46 19.94 ~ 19 0
45 2MASS J02245198-0403001 AGN 02 24 51.998 -04 02 59.94   20.91     18.82 ~ 7 0
46 SDSS J022451.99-041211.0 QSO 02 24 51.9987891504 -04 12 10.949701716   19.77     18.91 ~ 21 0
47 3XMM J022452.1-040519 Sy1 02 24 52.2048982176 -04 05 19.543984728   20.23     19.60 ~ 23 0
48 SDSS J022456.10-041725.5 QSO 02 24 56.104 -04 17 25.61           ~ 10 0
49 SDSS J022501.70-040754.4 QSO 02 25 01.7013387528 -04 07 54.334015464   19.88     19.49 ~ 17 0
50 SDSS J022503.19-040539.7 QSO 02 25 03.200 -04 05 39.74   21.22     20.62 ~ 16 0
51 VIDEO J022504.51-043707.46 AGN 02 25 04.51 -04 37 07.6   24.04     22.69 ~ 5 0
52 SDSS J022506.43-043621.2 QSO 02 25 06.430 -04 36 21.29   22.37     20.77 ~ 11 0
53 SDSS J022509.55-040838.4 QSO 02 25 09.5630342904 -04 08 38.348077236   20.38     19.87 ~ 13 0
54 VIDEO J022510.65-043549.29 AGN 02 25 10.65 -04 35 49.3   25.65     24.86 ~ 5 0
55 XMDS J022510.6-042928 AGN 02 25 10.689 -04 29 28.26   24.55     23.25 ~ 3 0
56 XMDS J022511.4-041916 X 02 25 11.497 -04 19 17.39           ~ 2 0
57 3XLSS J022511.8-041910 AGN 02 25 11.90 -04 19 11.0   24.83     23.59 ~ 8 0
58 SDSS J022512.73-044634.0 AG? 02 25 12.739 -04 46 34.06   22.20     19.41 ~ 5 0
59 SDSS J022514.39-044700.2 QSO 02 25 14.3937779352 -04 47 00.304370880   18.63   19.225 18.17 ~ 15 0
60 VIDEO J022520.99-043227.07 G 02 25 20.99 -04 32 27.1   24.51     21.59 ~ 4 0
61 2MASS J02252109-0439496 AGN 02 25 21.0895624584 -04 39 49.848914088   21.08   19.416 18.39 ~ 11 0
62 SDSS J022522.86-042648.0 QSO 02 25 22.866 -04 26 48.02   23.37   21.8 20.68 ~ 11 0
63 HSCS J022525-044045 ClG 02 25 24.6 -04 40 45       17.3   ~ 41 0
64 VIDEO J022531.35-044213.75 G 02 25 31.36 -04 42 13.8   23.866 23.111 22.866 22.069 ~ 6 0
65 SDSS J022537.16-042132.9 QSO 02 25 37.1666367696 -04 21 32.949760860   19.39   19.196 19.11 ~ 19 0
66 SDSS J022539.04-040821.2 AGN 02 25 39.046 -04 08 21.20   22.08     20.25 ~ 7 0
67 2MASS J02254456-0419345 G 02 25 44.5737240480 -04 19 34.525214076   19.64     17.49 ~ 10 0
68 SDSS J022545.00-043736.2 QSO 02 25 45.003 -04 37 36.24   24.667 22.955 22.643 22.143 ~ 12 0
69 2XLSSd J022554.2-044921 AGN 02 25 54.246 -04 49 21.71   23.80     21.73 ~ 5 0
70 SDSS J022556.10-044724.5 QSO 02 25 56.104 -04 47 24.55   20.92   20.0 20.16 ~ 19 1
71 2XLSSd J022600.2-044412 QSO 02 26 00.29 -04 44 15.6   24.76     22.03 ~ 7 0
72 SDSS J022605.39-045804.6 QSO 02 26 05.396 -04 58 04.72   21.33     21.20 ~ 11 0
73 2XLSSd J022606.6-045722 QSO 02 26 06.745 -04 57 23.49   20.93   20.46 20.14 ~ 9 0
74 SDSS J022607.76-041843.2 QSO 02 26 07.7723504496 -04 18 43.190318376   19.41   20.37 18.95 ~ 22 0
75 2XLSSd J022610.9-044551 AGN 02 26 10.98 -04 45 50.5   23.13     22.15 ~ 5 0
76 2XLSSd J022614.4-040739 AGN 02 26 14.58 -04 07 37.0           ~ 4 0
77 2XLSSd J022615.1-045355 AGN 02 26 15.124 -04 53 56.12   23.06     21.13 ~ 7 0
78 SDSS J022617.19-044724.2 AGN 02 26 17.1970141488 -04 47 24.327348324   18.90   17.4 17.38 ~ 14 0
79 SDSS J022622.16-042221.8 QSO 02 26 22.1708989728 -04 22 21.866787660   19.285 19.114 19.053 18.507 ~ 26 0
80 VIDEO J022625.27-044648.12 AGN 02 26 25.27 -04 46 48.1   24.51     24.40 ~ 7 0
81 SDSS J022626.61-041212.9 AG? 02 26 26.613 -04 12 12.93           ~ 7 0
82 SDSS J022627.40-045711.1 QSO 02 26 27.409 -04 57 11.10   21.85     21.14 ~ 12 0
83 2XLSSd J022628.9-045254 QSO 02 26 29.026 -04 52 51.21   21.86     19.82 ~ 8 0
84 SDSS J022629.26-043057.1 QSO 02 26 29.2697717232 -04 30 57.240150264   20.10   19.8 19.75 ~ 20 0
85 2XLSSd J022633.2-044636 AGN 02 26 33.304 -04 46 37.14   25.01     21.29 ~ 6 0
86 VIDEO J022640.50-044607.51 G 02 26 40.50 -04 46 07.5           ~ 3 0
87 SDSS J022643.64-043317.9 AGN 02 26 43.646 -04 33 17.94   19.70   17.8 17.80 ~ 10 0
88 2MASS J02264393-0416268 AGN 02 26 43.9524922464 -04 16 27.216379956   20.96     18.34 ~ 11 0
89 SDSS J022644.23-040720.2 QSO 02 26 44.2475050272 -04 07 20.238631968   19.87     19.47 ~ 19 0
90 2XMM J022648.9-042746 Sy1 02 26 48.9986106912 -04 27 46.600963272   20.04   19.0 18.92 ~ 19 0
91 SDSS J022649.35-042922.3 AGN 02 26 49.354 -04 29 22.33   23.259 22.062 21.112 20.207 ~ 12 0
92 SDSS J022649.40-041153.7 QSO 02 26 49.402 -04 11 53.71   22.939 22.739 22.247 21.737 ~ 13 0
93 XMDS J022649.7-041240 Rad 02 26 49.855 -04 12 40.51   21.70     18.93 ~ 4 0
94 3XMM J022651.7-045714 Sy1 02 26 51.773 -04 57 15.09   21.93   20.4 19.78 ~ 23 0
95 SDSS J022652.12-040557.2 QSO 02 26 52.1393839032 -04 05 57.158786940   20.62     20.61 ~ 17 0
96 SDSS J022655.59-040651.9 QSO 02 26 55.591 -04 06 51.96   22.35     20.54 ~ 11 0
97 2XLSSd J022656.2-040822 AGN 02 26 56.2128 -04 08 22.452   22.47     20.30 ~ 3 0
98 VIDEO J022658.93-042321.00 AGN 02 26 58.937 -04 23 20.86 24.819 24.740 23.716 22.918 21.938 ~ 10 0
99 SDSS J022659.79-041108.8 AGN 02 26 59.790 -04 11 08.82   22.28     20.32 ~ 6 0
100 2MASS J02270077-0420205 Sy1 02 27 00.7802693400 -04 20 20.627013840   17.71   16.90 16.34 ~ 31 0
101 2MASS J02270142-0407509 QSO 02 27 01.4688108480 -04 07 51.268549368   20.20   18.6 18.04 ~ 21 0
102 SDSS J022701.49-040913.0 AGN 02 27 01.499 -04 09 13.03   21.39     20.18 ~ 8 0
103 2XLSSd J022701.5-045159 G 02 27 01.68 -04 51 57.7           ~ 4 0
104 SDSS J022707.43-040439.0 QSO 02 27 07.440 -04 04 39.09   21.54     19.69 ~ 13 0
105 XMDS 91 X 02 27 10.185 -04 16 49.54           ~ 3 0
106 SDSS J022711.81-045038.0 QSO 02 27 11.809 -04 50 38.02   21.17     20.42 ~ 18 0
107 SDSS J022712.80-044221.9 AGN 02 27 12.8053867800 -04 42 21.975614604   19.79   18.4 17.90 ~ 17 0
108 2MASS J02271299-0446364 QSO 02 27 12.9841015056 -04 46 36.416926776   18.030 18.085 17.993 17.692 ~ 19 1
109 VIDEO J022713.23-040912.46 AGN 02 27 13.23 -04 09 12.5   25.03     22.34 ~ 4 0
110 SDSS J022716.12-044539.0 QSO 02 27 16.1204235720 -04 45 39.075905484   20.42     20.02 ~ 22 0
111 SDSS J022719.57-041407.2 AGN 02 27 19.571 -04 14 07.26           ~ 4 0
112 2XLSSd J022720.2-045738 AGN 02 27 20.332 -04 57 40.33   23.05     21.70 ~ 7 0
113 SDSS J022723.63-045608.2 QSO 02 27 23.639 -04 56 08.30   22.18     21.34 ~ 12 0
114 LEDA 1053708 AGN 02 27 25.5000995976 -04 46 19.888767444   16.99   15.77 15.29 ~ 12 0
115 SDSS J022726.32-043328.2 AGN 02 27 26.322 -04 33 28.23   21.39     19.03 ~ 6 0
116 SDSS J022727.82-040807.4 AGN 02 27 27.829 -04 08 07.41   21.03     19.96 ~ 6 0
117 2XLSSd J022729.0-044858 AGN 02 27 28.88 -04 48 58.4   27.35     24.03 ~ 5 0
118 SDSS J022729.23-043227.8 QSO 02 27 29.2355888088 -04 32 27.834526608   19.336 19.102 19.120 19.042 ~ 24 0
119 2XLSSd J022731.9-044957 AGN 02 27 31.882 -04 49 58.20   22.63     20.95 ~ 8 0
120 SDSS J022732.62-043544.4 AGN 02 27 32.623 -04 35 44.49   22.74     21.90 ~ 9 0
121 XMDS J022735.6-041317 X 02 27 35.721 -04 13 17.04           ~ 3 0
122 SDSS J022735.73-041124.0 QSO 02 27 35.739 -04 11 24.09           ~ 13 0
123 SDSS J022736.92-045033.6 AGN 02 27 36.921 -04 50 33.69   21.86     19.44 ~ 11 0
124 VIDEO J022737.04-043031.11 AGN 02 27 37.04 -04 30 31.1   23.79     22.10 ~ 5 0
125 XMDS J022742.1-043607 Rad 02 27 42.144 -04 36 07.74           ~ 4 0
126 2XLSSd J022746.1-042852 AGN 02 27 46.10 -04 28 53.0   23.790 23.499 23.575 23.197 ~ 7 0
127 SDSS J022748.85-042821.0 QSO 02 27 48.8625186120 -04 28 21.054310860   19.59     19.09 ~ 14 0
128 SDSS J022751.51-044252.9 QSO 02 27 51.5088044664 -04 42 52.861598388   20.19     19.82 ~ 19 0
129 SDSS J022756.39-042906.1 AGN 02 27 56.394 -04 29 06.16   23.36     20.85 ~ 4 0
130 VIDEO J022758.63-043112.32 AGN 02 27 58.63 -04 31 12.3   25.67     23.29 ~ 5 0
131 XMDS J022802.3-042546 AGN 02 28 02.357 -04 25 46.82   23.27     20.71 ~ 3 0
132 XMDS J022804.5-041818 X 02 28 04.571 -04 18 18.12           ~ 3 0
133 SDSS J022809.07-041234.9 QSO 02 28 09.0898468944 -04 12 34.954315776   19.83   19.2 19.04 ~ 20 0
134 SDSS J022809.59-041524.4 G 02 28 09.593 -04 15 24.44   24.60     21.74 ~ 5 0
135 XMDS J022812.2-043230 AGN 02 28 12.290 -04 32 30.77   21.17     20.48 ~ 3 0
136 XMDS J022815.2-042617 X 02 28 15.285 -04 26 17.03           ~ 3 0
137 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2047 1
138 [VV96] J102434.5+470911 Sy1 10 24 34.5 +47 09 11     20.5     ~ 482 0
139 [OM2008] 100 QSO 10 44 09.95 +58 52 24.7 24.29     23.56   ~ 25 0

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2023.10.05-02:47:47

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