2006ApJ...645..115R

Query : 2006ApJ...645..115R

2006ApJ...645..115R - Astrophys. J., 645, 115-133 (2006/July-1)

Why X-ray-selected active galactic nuclei appear optically dull.

RIGBY J.R., RIEKE G.H., DONLEY J.L., ALONSO-HERRERO A. and PEREZ-GONZALEZ P.G.

Abstract (from CDS):

We investigate why half of X-ray-selected active galactic nuclei (AGNs) in deep surveys lack signs of accretion in their optical spectra. The majority of these ``optically dull'' AGNs are no more than ∼6 times fainter than their host galaxies in rest-frame R band; as such, AGN lines are unlikely to be overwhelmed by stellar continuum in at least half the sample. We find that optically dull AGNs have the mid-infrared emission and LX/LIRratios characteristic of local Seyfert galaxies, suggesting that the cause of optical dullness is not missing UV-optical continua. We compare the morphologies of 22 optically dull and 9 optically active AGNs at 0.5<z<0.8 and find that optically dull AGNs show a wide range of axis ratio, but optically active AGNs have only very round axis ratios. We conclude that hard X-rays select AGNs in host galaxies with a wide range of inclination angle, but only those AGNs in the most face-on or spheroidal host galaxies show optical emission lines. Thus, extranuclear dust in the host galaxy plays an important role in hiding the emission lines of optically dull AGNs.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Infrared: Galaxies - X-Rays: Galaxies

Simbad objects: 97

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Number of rows : 97
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 CXOCDFS J033148.0-275046 Sy1 03 31 47.969 -27 50 45.33 23.85 23.95 24.00 23.74 23.32 ~ 25 0
2 [LBX2017] 39 AGN 03 31 51.172 -27 50 51.22   24.78 23.76 22.519 21.49 ~ 17 0
3 [LBX2017] 42 Sy2 03 31 51.94 -27 53 27.2 26.57 25.14 25.38 24.74   ~ 62 0
4 [LBX2017] 49 QSO 03 31 52.472 -27 50 17.34   25.22 24.83 24.46 23.87 ~ 29 0
5 CXOCDFS J033153.6-274844 Sy1 03 31 53.515 -27 48 43.02   24.26 24.68 24.210   ~ 23 0
6 CXOCDFS J033155.4-275448 Sy2 03 31 55.35 -27 54 48.2   22.07 21.65 20.712 20.00 ~ 31 0
7 [LBX2017] 79 AGN 03 31 58.102 -27 48 33.81   23.6447 22.8522 22.061 21.1009 ~ 31 0
8 CXOCDFS J033200.4-274320 Sy1 03 32 00.37 -27 43 20.0 22.76 22.7055 22.335 22.1283 22.2135 ~ 57 0
9 [VV2006] J033201.6-274327 QSO 03 32 01.59 -27 43 27.3 24.86 24.5724 24.07 23.405 23.9921 ~ 52 0
10 CXOCDFS J033202.5-274601 Sy1 03 32 02.45 -27 46 00.5   24.291 24.5944 22.425 23.7324 ~ 48 0
11 CANDELS UDS F160W J033203.04-274450.1 Sy2 03 32 03.07 -27 44 50.1   26.9484   25.45 25.0739 ~ 46 0
12 ACS-GC 90046082 Sy2 03 32 03.66 -27 46 03.7   23.5861   20.778 20.2362 ~ 62 0
13 ATCDFS J033204.81-274125.8 Sy2 03 32 04.85 -27 41 27.7   24.050   24.284 24.0258 ~ 39 0
14 ACS-GC 90043490 Sy2 03 32 07.98 -27 42 39.9   23.6922 23.2064 22.3383 21.8034 ~ 51 0
15 NAME CDFS J033208.3-274153 Sy1 03 32 08.28 -27 41 53.6   25.4892   24.580 25.3896 ~ 42 0
16 2MASS J03320855-2746483 rG 03 32 08.538 -27 46 48.55   21.0851 20.1035 19.224 18.9552 ~ 63 0
17 [VV2006] J033208.7-274735 QSO 03 32 08.6729857488 -27 47 34.647814356 19.78 19.4713 19.11 18.665 18.6210 ~ 93 0
18 [VV2006] J033209.5-274807 QSO 03 32 09.4575891792 -27 48 07.049493144 22.94 21.4745 21.07 20.422 20.4857 ~ 66 0
19 2XMM J033210.9-274415 Sy1 03 32 10.91 -27 44 15.1 23.35 22.500 22.882 22.50 22.3707 ~ 83 0
20 ACS-GC 90045288 Sy2 03 32 11.4075 -27 46 49.973   23.8731 23.1241 22.070 21.423 ~ 54 0
21 ACS-GC 90044172 AGN 03 32 12.196 -27 45 30.11   24.6655 22.444 21.789 21.2217 ~ 49 0
22 ACS-GC 90045884 Sy2 03 32 12.22015 -27 46 20.6382   23.414 24.0292 23.3426 22.266 ~ 57 0
23 CXOCDFS J033213.0-275238 Sy2 03 32 12.96 -27 52 36.5       24.040 23.899 ~ 52 0
24 CXOCDFS J033213.3-275530 Sy2 03 32 13.200 -27 55 28.47   24.50 24.08 22.97 21.41 ~ 33 0
25 ACS-GC 90045613 Sy2 03 32 13.257 -27 42 40.65   21.6424 20.820 20.164 19.8240 ~ 87 0
26 ACS-GC 90042414 Sy2 03 32 13.822 -27 45 25.64   23.896 24.19 24.692 22.932 ~ 46 0
27 ACS-GC 90045746 Sy2 03 32 13.8495 -27 42 49.018   23.1221 22.348 21.8155 21.2325 ~ 66 0
28 CXOCDFS J033214.1-275101 Sy2 03 32 13.98 -27 51 00.3   23.9234   22.61 21.809 ~ 50 0
29 ACS-GC 90045314 Sy2 03 32 14.42141 -27 51 10.7305   24.3772   24.246 23.3772 ~ 59 0
30 [LBX2017] 260 Sy2 03 32 14.55 -27 54 21.1   25.65   25.47   ~ 35 0
31 ACS-GC 90041713 Sy1 03 32 14.95 -27 51 26.9   21.913   22.751 20.751 ~ 53 0
32 [VV2006] J033216.2-273931 QSO 03 32 16.2096967968 -27 39 30.684107772 20.74 20.29 20.03 19.72 19.66 ~ 49 0
33 ACS-GC 90042334 Sy1 03 32 17.15 -27 43 03.6 23.16 22.5303 22.1603 21.068 20.8398 ~ 88 0
34 CANDELS UDS F160W J033218.24-275241.4 Sy1 03 32 18.2555 -27 52 41.418   24.5285 24.6214 24.102 24.2474 ~ 52 0
35 ACS-GC 90045885 Sy2 03 32 18.39 -27 50 55.3   24.8876 24.190 23.82 23.039 ~ 85 0
36 ACS-GC 90043051 Sy2 03 32 19.02 -27 47 55.7   26.460   24.525 23.664 ~ 51 0
37 ACS-GC 90045761 rG 03 32 19.817 -27 41 22.59 23.36 21.0407 19.580 19.178 18.9776 ~ 63 0
38 ACS-GC 90042601 Sy2 03 32 20.05005 -27 44 47.1529   22.941   25.050 24.7064 ~ 55 0
39 ACS-GC 90044373 Sy2 03 32 20.47022 -27 47 32.3484   22.743 23.88 24.752 21.863 ~ 56 0
40 CXOCDFS J033222.0-274657 AGN 03 32 21.998 -27 46 55.78   23.4609 22.7604 21.646 20.722 ~ 50 0
41 CXOCDFS J033222.6-274950 Sy2 03 32 22.53830 -27 49 49.7903   23.498   22.006 22.332 ~ 42 0
42 ACS-GC 90042565 rG 03 32 24.26 -27 41 26.8   23.4284 21.661 20.832 20.6072 ~ 51 0
43 CXOCDFS J033224.7-275413 AGN 03 32 24.6741 -27 54 11.696   22.84 22.33 21.63 21.399 ~ 27 0
44 ACS-GC 90043946 Sy2 03 32 24.98108 -27 41 01.5074   23.4535   21.973 21.4414 ~ 47 0
45 ACS-GC 90041437 Sy2 03 32 25.1059 -27 50 43.256   24.8238   24.08 22.938 ~ 47 0
46 ACS-GC 90040981 Sy2 03 32 25.157 -27 54 50.10   23.166   23.17 22.1691 ~ 66 0
47 [PBM2009] s124624 Sy1 03 32 25.21 -27 42 18.8   24.7725 23.75 23.21 22.6063 ~ 92 0
48 CANDELS UDS F160W J033225.68-274305.6 Sy2 03 32 25.74 -27 43 05.6   26.617 25.773 26.13 25.3679 ~ 76 0
49 CXOCDFS J033225.9-275508 AGN 03 32 25.8597 -27 55 06.400   24.086 23.728 23.718 22.801 ~ 31 0
50 ACS-GC 90044816 Sy2 03 32 26.7775 -27 41 45.721   24.1616 23.6837 22.515 21.8872 ~ 54 0
51 [VV2006] J033227.0-274105 QSO 03 32 27.0132796944 -27 41 05.357500044 19.93 19.3746   19.003 19.1163 ~ 93 1
52 ACS-GC 90045964 Sy2 03 32 27.623 -27 41 44.91   24.0498 23.2945 22.252 21.6131 ~ 61 0
53 [VV2006] J033229.9-275106 Sy2 03 32 29.8487 -27 51 05.879   27.5675 25.05 23.970 24.5370 ~ 101 0
54 2XMM J033229.9-274528 Sy1 03 32 29.976 -27 45 29.77 21.66 21.1307 21.33 21.298 21.1036 ~ 80 1
55 ACS-GC 90042078 Sy1 03 32 30.0611 -27 45 23.526 23.96 23.2871 23.0874 22.5697 22.010 ~ 70 0
56 ACS-GC 90042521 Sy1 03 32 30.2159 -27 45 04.590 23.17 22.5984 22.2969 21.958 21.7127 ~ 71 0
57 CXOCDFS J033231.4-274727 AGN 03 32 31.356 -27 47 24.94 22.8607 22.5513 21.80 21.463 21.176 ~ 57 0
58 ACS-GC 90045460 Sy2 03 32 31.462 -27 46 23.07 25.05 23.96 23.64 23.28 23.001 ~ 118 0
59 CXOCDFS J033234.5-274351 Sy2 03 32 34.344 -27 43 50.10   24.3924   21.878 21.4358 ~ 46 0
60 ACS-GC 90040296 Sy2 03 32 34.947 -27 55 11.16   23.7556   22.920 22.1896 ~ 59 0
61 ACS-GC 90042103 rG 03 32 35.103 -27 44 10.60   24.9342 24.00 23.80 24.0233 ~ 36 0
62 NAME BzK 4892 Sy2 03 32 35.73 -27 49 16.2   25.681 27.798 25.00 24.645 ~ 89 0
63 ACS-GC 90044174 AGN 03 32 35.842 -27 40 59.49   24.4130   22.471 21.7624 ~ 49 0
64 ACS-GC 90042362 QSO 03 32 35.974 -27 48 50.40 24.39 22.3798 22.3070 22.413 21.847 ~ 60 0
65 ACS-GC 90043479 rG 03 32 36.70 -27 44 06.1   22.732 23.6511 22.6377 20.548 ~ 72 0
66 ACS-GC 90042433 Sy1 03 32 37.45 -27 40 00.3   23.5237 22.9339 22.614 22.1550 ~ 53 0
67 ACS-GC 90041753 Sy2 03 32 37.75 -27 52 12.3   25.2146 24.717 24.68 24.1108 ~ 87 0
68 ACS-GC 90043401 Sy1 03 32 38.1232741056 -27 39 45.158278032 20.89 20.9342 20.511 20.4095 20.6297 ~ 69 0
69 GOODS-MUSIC 13418 Sy2 03 32 38.9 -27 44 39   25.544 25.322 24.340   ~ 9 1
70 CXOCDFS J033239.1-274440 AGN 03 32 39.052 -27 44 39.32   27.8340     26.304 ~ 44 1
71 [VV2006] J033239.1-274602 QSO 03 32 39.0897389184 -27 46 02.044213860 21.11 21.413 21.157 20.68 20.812 ~ 82 0
72 ACS-GC 90045073 Sy2 03 32 39.670 -27 48 50.60   27.3148   25.18 24.512 ~ 108 0
73 ATCDFS J033240.82-275545.8 Sy2 03 32 40.83 -27 55 46.6   26.87 26.153 25.42 25.4033 ~ 64 0
74 [VV2006] J033241.9-275203 QSO 03 32 41.84 -27 52 02.3   24.3501 23.03 22.529 22.4031 ~ 68 1
75 CXOCDFS J033242.9-274703 Sy1 03 32 42.837 -27 47 02.53   25.6384 24.571 24.100 24.311 ~ 81 0
76 ACS-GC 90040004 AGN 03 32 44.01233 -27 54 54.1145   22.759 25.300 24.927 24.407 ~ 33 0
77 [VV2006] J033244.4-275252 QSO 03 32 44.28 -27 52 51.0   25.0168   23.904 23.8566 ~ 51 0
78 CANDELS UDS F160W J033244.60-274835.9 QSO 03 32 44.599 -27 48 35.88   25.6176   25.070 24.7295 ~ 54 0
79 ACS-GC 90040131 Sy2 03 32 46.41 -27 54 13.7   23.0602 21.86 20.683 19.9987 ~ 51 0
80 CXOCDFS J033247.1-274346 Sy2 03 32 46.97 -27 43 46.6   23.592   23.683 22.612 ~ 42 0
81 BLAST J033247-274221 QSO 03 32 47.886 -27 42 32.82   22.51 22.12 21.65 20.51 ~ 49 0
82 CXOCDFS J033248.0-274148 Sy2 03 32 47.91 -27 41 47.9   22.913 22.55 22.113 21.11 ~ 41 0
83 ACS-GC 90039535 Sy2 03 32 48.18 -27 52 56.7   23.3386 22.3444 20.974 20.3029 ~ 59 0
84 ATCDFS9 J033249.19-274050.7 Sy2 03 32 49.2 -27 40 50   22.613 23.0872 22.61 21.5187 ~ 54 1
85 CXOCDFS J033251.9-274229 rG 03 32 51.848 -27 42 29.38   23.3581 22.8797 23.120 21.4143 ~ 40 0
86 ACS-GC 90040278 Sy1 03 32 52.89 -27 51 19.8   22.837   23.541 22.3247 ~ 56 0
87 ACS-GC 90019078 Sy1 03 32 55.51 -27 47 51.5   24.92 24.67 24.16 24.3274 ~ 32 0
88 [LBX2017] 926 AGN 03 32 58.600 -27 46 33.02     24.906 23.250   ~ 20 0
89 CXOCDFS J033259.1-274340 Sy2 03 32 59.05 -27 43 39.7 22.26 21.90 21.61 20.973 20.41 ~ 40 0
90 CXOCDFS J033259.8-275031 AGN 03 32 59.6818187880 -27 50 30.590830608   20.084   19.863 19.6215 ~ 32 0
91 [LBX2017] 937 AGN 03 32 59.762 -27 46 26.24   22.10 21.41 20.351 19.83 ~ 32 0
92 [VV2006] J033259.8-274749 QSO 03 32 59.8499816688 -27 47 48.381054396 22.29 22.0936 21.6616 21.9181 21.9483 ~ 47 0
93 CXOCDFS J033301.7-274543 Sy1 03 33 01.534 -27 45 42.36   22.41 21.82 20.687 20.12 ~ 33 0
94 CXOCDFS J033303.7-274519 Sy1 03 33 03.64 -27 45 18.5   23.7809 23.2970 22.9775 22.7093 ~ 32 0
95 CXOCDFS J033309.3-274449 AGN 03 33 09.24 -27 44 49.5   23.6026 23.2116 22.360 21.4437 ~ 25 0
96 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
97 NGC 4429 GiG 12 27 26.5040002440 +11 06 27.588767616   11.4       ~ 348 0

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