2005MNRAS.358..693C

Query : 2005MNRAS.358..693C

2005MNRAS.358..693C - Mon. Not. R. Astron. Soc., 358, 693-704 (2005/April-1)

X-ray spectral analysis of optically faint sources in the Chandra deep fields.

CIVANO F., COMASTRI A. and BRUSA M.

Abstract (from CDS):

We present the results of a detailed spectral analysis of optically faint hard X-ray sources in the Chandra deep fields selected on the basis of their high X-ray to optical flux ratio (X/O). The stacked spectra of high X/O sources in both Chandra deep fields, fitted with a single power-law model, are much harder than the spectrum of the X-ray background (XRB). The average slope is also insensitive to the 2-8 keV flux, being approximately constant around Γ≃ 1 over more than two decades, strongly indicating that high X/O sources represent the most obscured component of the XRB. For about half of the sample, a redshift estimate (in most of the cases a photometric redshift) is available from the literature. Individual fits of a few of the brightest objects and of stacked spectra in different redshift bins imply column densities in the range 1022-1023.5/cm2. A trend of increasing absorption towards higher redshifts is suggested.

Abstract Copyright: 2005 RAS

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

Simbad objects: 113

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Number of rows : 113
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [LBX2017] 19 AGN 03 31 47.27 -27 53 13.3   25.88 25.52 25.55 25.25 ~ 24 0
2 [LBX2017] 27 AGN 03 31 49.471 -27 50 33.69   25.82 25.62 25.61 26.95 ~ 22 0
3 [LBX2017] 31 AGN 03 31 50.389 -27 51 51.58   26.90 26.70 26.00 24.66 ~ 23 0
4 [LBX2017] 42 Sy2 03 31 51.94 -27 53 27.2 26.57 25.14 25.38 24.74   ~ 59 0
5 [LBX2017] 49 QSO 03 31 52.472 -27 50 17.34   25.22 24.83 24.46 23.87 ~ 29 0
6 [LBX2017] 73 AGN 03 31 57.059 -27 51 08.26       26.3   ~ 21 0
7 CXOCDFS J033202.5-274601 Sy1 03 32 02.45 -27 46 00.5   24.291 24.5944 22.425 23.7324 ~ 46 0
8 CXOCDFS J033202.6-274430 AGN 03 32 02.57 -27 44 30.0   27.98 26.97   26.684 ~ 31 0
9 [LBX2017] 120 AGN 03 32 03.875 -27 53 28.83   26.48 26.19 26.01 25.14 ~ 29 0
10 [LBX2017] 134 AGN 03 32 05.169 -27 53 54.56   24.89 24.48 23.91 23.46 ~ 26 0
11 [SWM2014] GOODS-S 28908 AGN 03 32 05.3468 -27 46 44.100   27.9053     25.816 ~ 43 0
12 [LBX2017] 145 AGN 03 32 06.14 -27 49 28.4   24.925 25.07 24.66 23.573 ~ 28 0
13 [LBX2017] 170 AGN 03 32 07.99858 -27 46 57.2578   25.6308   24.931 25.0534 ~ 43 0
14 CXOCDFS J033208.5-274047 AGN 03 32 08.383 -27 40 46.75   28.32 27.71   25.87 ~ 35 0
15 CXOCDFS J033210.6-274309 QSO 03 32 10.50 -27 43 09.2   24.551 23.16 21.53 22.316 ~ 38 0
16 [LBX2017] 214 AGN 03 32 11.382 -27 52 13.45       26.8   ~ 40 0
17 [SWM2014] GOODS-S 29954 AGN 03 32 11.78 -27 46 28.5   26.64   26.27 25.531 ~ 50 0
18 CXOCDFS J033213.0-275238 Sy2 03 32 12.96 -27 52 36.5       24.040 23.899 ~ 48 0
19 ALESS J033213.85-275600.3 AGN 03 32 13.846 -27 56 00.09 27.86 28.22 27.73 25.6 25.90 ~ 56 0
20 [LBX2017] 260 Sy2 03 32 14.55 -27 54 21.1   25.65   25.47   ~ 34 0
21 [LBX2017] 281 AGN 03 32 15.761 -27 39 53.95   25.34 25.27 24.73 24.12 ~ 17 0
22 ACS-GC 90045885 Sy2 03 32 18.39 -27 50 55.3   24.8876 24.190 23.82 23.039 ~ 80 0
23 [LBA2005] 356 AGN 03 32 19.950 -27 42 43.19   28.0511 26.18 25.4 27.1838 ~ 34 0
24 ACS-GC 90042601 Sy2 03 32 20.05005 -27 44 47.1529   22.941   25.050 24.7064 ~ 53 0
25 ACS-GC 90042090 AGN 03 32 22.52 -27 46 04.2   25.2790   24.91 24.424 ~ 60 0
26 ACS-GC 90040743 AGN 03 32 24.84558 -27 55 59.9693   25.2158 24.752 24.65 23.523 ~ 45 0
27 CANDELS UDS F160W J033225.68-274305.6 Sy2 03 32 25.74 -27 43 05.6   26.617 25.773 26.13 25.3679 ~ 73 0
28 CANDELS UDS F160W J033225.95-274514.3 AGN 03 32 25.9457 -27 45 14.347   27.8578   26.040 25.8074 ~ 34 0
29 [LBX2017] 490 AGN 03 32 26.7783 -27 46 03.991   28.9513     27.239 ~ 44 0
30 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2088 1
31 CXOCDFS J033232.2-274652 AGN 03 32 32.170 -27 46 51.49   28.3350 27.2830   26.411 ~ 47 0
32 CXOCDFS J033233.4-274236 AGN 03 32 33.285 -27 42 36.01   27.6501 27.187   25.5120 ~ 44 0
33 [SWM2014] GOODS-S 5001 AGN 03 32 35.2075 -27 53 18.019   27.5835     26.282 ~ 38 0
34 ACS-GC 90041753 Sy2 03 32 37.75 -27 52 12.3   25.2146 24.717 24.68 24.1108 ~ 80 0
35 ASPECS LP.1mm.C08 AGN 03 32 38.029 -27 46 26.31 28.2222 28.4300 27.60 27.04 26.106 ~ 64 1
36 ACS-GC 90045073 Sy2 03 32 39.670 -27 48 50.60   27.3148   25.18 24.512 ~ 95 0
37 ASPECS LP.3mm.05 AGN 03 32 39.737 -27 46 11.25 25.2508 25.0913 25.00 24.94 23.902 ~ 92 0
38 ATCDFS J033240.82-275545.8 Sy2 03 32 40.83 -27 55 46.6   26.87 26.153 25.42 25.4033 ~ 62 0
39 CANDELS UDS F160W J033241.87-274359.9 AGN 03 32 41.87599 -27 43 59.9419   23.136   25.068 25.1361 ~ 42 0
40 ACS-GC 90044579 AGN 03 32 43.038 -27 48 45.09   26.3069 25.14 25.56 24.431 ~ 51 0
41 ACS-GC 90072761 AGN 03 32 46.35 -27 46 32.2   26.4203   25.140 24.485 ~ 50 0
42 CXOCDFS J033247.2-275335 QSO 03 32 47.0589 -27 53 33.531   30.967   25.98 26.2117 ~ 36 0
43 [FPG2012] M3320 QSO 03 32 50.24688 -27 52 51.9384   26.5873 25.63   24.8575 ~ 41 0
44 CXOCDFS J033251.8-275214 AGN 03 32 51.644 -27 52 12.94   28.350 28.00   27.311 ~ 36 0
45 [SWM2014] GOODS-S 45789 AGN 03 33 01.48 -27 41 42.1   22.357 24.71 23.878 22.18 ~ 28 0
46 ATCDFS J033302.99-275147.3 QSO 03 33 03.050 -27 51 45.77       25.33 25.3944 ~ 45 0
47 [LBX2017] 971 AGN 03 33 05.904 -27 46 50.46   28.15 28.52 27.73 25.10 ~ 24 0
48 CXOCDFS J033307.7-275127 AGN 03 33 07.60 -27 51 27.1   22.876 23.73 23.365 23.87 ~ 31 0
49 ATCDFS9 J033310.19-274842.2 QSO 03 33 10.21 -27 48 42.2 24.27 23.866 23.14 22.97 22.00 ~ 47 0
50 CXOHDFN J123521.5+621502 X 12 35 21.86 +62 15 00.9 27.8 27.7 26.9 27.4 25.9 ~ 8 0
51 CXOHDFN J123524.9+621523 X 12 35 24.92 +62 15 24.6 26.4 26.1 26.0 25.7 25.0 ~ 8 0
52 CXOHDFN J123528.6+621428 X 12 35 28.75 +62 14 27.5   28.2 29.0 26.4 26.0 ~ 9 0
53 [ABB2003] CDFN 12 X 12 35 29.42 +62 18 22.9 27.2 27.1 27.2 26.0 26.0 ~ 7 0
54 CXOHDFN J123546.0+621600 X 12 35 46.05 +62 16 00.0 27.7 27.2 27.0 27.4 25.4 ~ 8 0
55 CXOHDFN J123546.1+621729 X 12 35 46.24 +62 17 29.7 27.1 27.6 28.1 27.3 26.5 ~ 8 0
56 CXOHDFN J123550.4+621809 X 12 35 50.41 +62 18 08.6 26.3 26.1 26.0 25.5 25.1 ~ 8 0
57 CXOHDFN J123551.7+621757 X 12 35 51.73 +62 17 57.0 26.5 26.6 27.1 26.7 26.7 ~ 8 0
58 CXOHDFN J123554.1+622011 X 12 35 54.06 +62 20 12.9     27.2 26.7 26.1 ~ 7 0
59 ACS-GC 50016604 AGN 12 35 56.112 +62 12 19.47 25.39 24.9236   23.9 22.5034 ~ 24 0
60 [ABB2003] CDFN 71 X 12 36 05.64 +62 06 53.3 28.2 27.3 26.8 26.0 25.6 ~ 6 0
61 CXOHDFN J123605.8+620837 X 12 36 05.81 +62 08 38.0     26.8 26.6 26.1 ~ 10 0
62 [ABB2003] CDFN 91 G 12 36 11.40 +62 21 49.9 28.1 26.3 25.9 25.3 24.8 ~ 9 0
63 ACS-GC 50008849 AGN 12 36 11.721 +62 10 14.98 26.8 26.4 26.6 26.0 26.7785 ~ 21 0
64 CXOHDFN J123613.1+621224 X 12 36 13.04 +62 12 24.1 25.5 25.5 25.8 25.8 25.7 ~ 11 0
65 CXOHDFN J123614.1+621017 G 12 36 14.1389 +62 10 17.489   29.2 28.5 29.1   ~ 14 0
66 ACS-GC 50007664 AGN 12 36 14.460 +62 10 45.48 25.6 25.5000 25.40 25.1 24.7007 ~ 20 0
67 CXOHDFN J123615.8+621515 AGN 12 36 15.84 +62 15 15.6 28.5 28.8 26.6 27.2 26.3 ~ 22 0
68 ACS-GC 50008343 AGN 12 36 16.049 +62 11 08.10 27.8 26.4916 26.5 25.7 25.1575 ~ 24 0
69 CXOHDFN J123621.9+621603 AGN 12 36 21.94 +62 16 03.6 27.4 27.1   27.0 27.3370 ~ 20 0
70 CXOHDFN J123622.6+621028 AGN 12 36 22.66 +62 10 28.7 29.6 26.1 26.4 25.58 25.3 ~ 18 0
71 CXOHDFN J123623.6+621009 G 12 36 23.6973 +62 10 09.095 29.8   27.7 27.5 26.5 ~ 17 0
72 ACS-GC 50008775 AGN 12 36 25.349 +62 17 37.72 31.0 27.0 26.2 25.8 24.9 ~ 10 0
73 AzGN 10 rG 12 36 27.56 +62 12 18.0 27.7 28.7 27.1   27.10 ~ 25 0
74 CXOHDFN J123628.6+622139 rG 12 36 28.67 +62 21 39.7 27.1 25.9 26.0 25.2 24.5 ~ 10 0
75 MODS wide 2039 G 12 36 28.8185 +62 11 40.074 29.0   28.5   29.4 ~ 11 0
76 CXOHDFN J123630.2+622620 X 12 36 30.17 +62 26 19.6 24.5 24.2 24.2 23.9 23.3 ~ 8 0
77 CXOHDFN J123634.6+620438 X 12 36 34.69 +62 04 37.6   26.4 26.2 25.9 25.4 ~ 7 0
78 CXOHDFN J123636.7+622227 X 12 36 36.87 +62 22 27.6 27.9 28.6 27.5 26.6 26.8 ~ 9 0
79 CXOHDFN J123636.8+621320 G 12 36 36.92 +62 13 20.3 30.0 27.9 28.6 28.3 26.49 ~ 26 0
80 CXOHDFN J123638.9+621041 X 12 36 38.96 +62 10 41.7     29.2   27.10 ~ 12 0
81 CXOHDFN J123644.9+622650 X 12 36 44.95 +62 26 50.8 25.6 25.2 25.3 24.9 24.4 ~ 7 0
82 CXOHDFN J123648.0+621019 AG? 12 36 47.95 +62 10 20.4 28.2 26.8   27.2 26.8276 ~ 20 0
83 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 659 0
84 CXOHDFN J123648.3+621456 X 12 36 48.28 +62 14 56.3 27.8 27.6 27.6 27.7 26.27 ~ 13 0
85 [ABB2003] CDFN 253 X 12 36 48.74 +62 21 53.3 26.3 26.1 26.0 25.7 25.8 ~ 6 0
86 ACS-GC 50006290 Sy2 12 36 49.654 +62 07 38.30 23.80 23.9691   23.4 23.2850 ~ 30 0
87 CXOHDFN J123656.5+621513 G 12 36 56.58 +62 15 13.0   26.7 28.1 27.0 26.20 ~ 19 0
88 CXOHDFN J123701.7+620720 G 12 37 01.59 +62 07 20.7 30.0   27.8 27.9 30.2 ~ 11 0
89 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
90 CXOHDFN J123704.8+621601 G 12 37 04.87 +62 16 01.4 27.6 26.9 26.7 26.1 25.4 ~ 18 0
91 CXOHDFN J123705.1+621635 X 12 37 05.12 +62 16 34.8 28.2   27.3 27.3 26.4 ~ 12 0
92 [ABB2003] CDFN 336 X 12 37 05.30 +62 24 53.9 27.8 26.4   26.8   ~ 6 0
93 CXOHDFN J123707.6+620534 X 12 37 07.68 +62 05 34.3 28.1 28.0 26.4 26.2 25.6 ~ 8 0
94 ACS-GC 50004819 AGN 12 37 09.417 +62 22 14.85 26.4 25.8 25.3 24.9 23.9 ~ 15 0
95 NAME SMM J123713.9+621827 AGN 12 37 13.86 +62 18 26.2     27.4 27.3 26.5 ~ 34 1
96 CXOHDFN J123715.2+620231 X 12 37 15.19 +62 02 30.2 26.4 26.1 26.1 26.0 25.7 ~ 8 0
97 ACS-GC 50005014 Sy2 12 37 16.675 +62 17 33.63 24.78 24.7910 24.18 23.4 22.6886 ~ 50 0
98 [ABB2003] CDFN 400 X 12 37 20.27 +62 07 26.9 28.5 27.5 27.9 26.7 25.1 ~ 6 0
99 CXOHDFN J123722.3+620536 X 12 37 22.43 +62 05 35.8   28.1 27.7 28.0   ~ 8 0
100 ACS-GC 50001111 AGN 12 37 23.989 +62 13 04.67 25.08 25.1264 25.48 24.7 24.6236 ~ 27 0
101 ACS-GC 50000643 Sy2 12 37 24.214 +62 14 00.17 25.94 24.9073   25.0 24.2524 ~ 14 0
102 CXOHDFN J123736.8+621428 AGN 12 37 36.91 +62 14 28.9 29.2 26.6 26.6 26.1 25.9 ~ 19 0
103 CXOHDFN J123737.0+621834 AG? 12 37 37.07 +62 18 34.3 27.7 28.0753   26.9 27.1783 ~ 15 0
104 [DRP2007] 26243 X 12 37 39.66 +62 22 39.0 28.3   28.3   26.3 ~ 6 0
105 CXOHDFN J123741.1+621047 X 12 37 41.16 +62 10 47.5 27.3 26.9 26.4 26.8 25.6 ~ 8 0
106 CXOHDFN J123744.9+620719 G 12 37 44.91 +62 07 18.9 28.3 26.7 26.8 26.9 28.0 ~ 9 0
107 CXOHDFN J123746.7+620713 X 12 37 46.81 +62 07 12.7 26.5 26.5 26.1 26.3 25.5 ~ 7 0
108 CXOHDFN J123750.1+621358 G 12 37 50.26 +62 13 58.9   26.8 27.0 26.2 25.2 ~ 14 0
109 CXOHDFN J123810.5+621728 X 12 38 10.57 +62 17 29.5 28.1 25.9 25.4 24.4 23.7 ~ 9 0
110 [MOD2010] 1208 G 12 38 22.23 +62 14 16.5 23.9 23.8 23.5 22.9 22.1 ~ 10 0
111 [ABB2003] CDFN 497 X 12 38 23.51 +62 15 16.7     26.8 27.0 25.5 ~ 6 0
112 [ABB2003] CDFN 498 X 12 38 23.76 +62 09 41.9 26.2 25.9 25.8 25.4 26.0 ~ 5 0
113 [ABB2003] CDFN 501 X 12 38 34.43 +62 14 40.4 28.3 26.4 27.4 26.1 25.3 ~ 6 0

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