2010ApJ...712..303C


Query : 2010ApJ...712..303C

2010ApJ...712..303C - Astrophys. J., 712, 303-317 (2010/March-3)

H I 21 cm absorption and unified schemes of active galactic nuclei.

CURRAN S.J. and WHITING M.T.

Abstract (from CDS):

In a recent study of z ≥ 0.1 active galactic nuclei (AGNs), we found that 21 cm absorption has never been detected in objects in which the ultraviolet luminosity exceeds LUV∼ 1023 W/Hz. In this paper, we further explore the implications that this has for the currently popular consensus that it is the orientation of the circumnuclear obscuring torus, invoked by unified schemes of AGNs, which determines whether absorption is present along our sight line. The fact that at LUV≲ 1023 W/Hz, both type-1 and type-2 objects exhibit a 50% probability of detection, suggests that this is not the case and that the bias against detection of H I absorption in type-1 objects is due purely to the inclusion of the LUV≳ 1023 W/Hz sources. Similarly, the ultraviolet luminosities can also explain why the presence of 21 cm absorption shows a preference for radio galaxies over quasars and the higher detection rate in compact sources, such as compact steep spectrum or gigahertz peaked spectrum sources, may also be biased by the inclusion of high-luminosity sources. Being comprised of all 21 cm searched sources at z ≥ 0.1, this is a necessarily heterogeneous sample, the constituents of which have been observed by various instruments. By this same token, however, the dependence on the UV luminosity may be an all encompassing effect, superseding the unified schemes model, although there is the possibility that the exclusive 21 cm non-detections at high UV luminosities could be caused by a bias toward gas-poor ellipticals. Additionally, the high UV fluxes could be sufficiently exciting/ionizing the H I above 21 cm detection thresholds, although the extent to which this is related to the neutral gas deficit in ellipticals is currently unclear. Examining the moderate UV luminosity (LUV≲ 1023 W/Hz) sample further, from the profile widths and offsets from the systemic velocities, we find no discernible differences between the two AGN types. This may suggest that the bulk of the absorption generally occurs in the galactic disk, which must therefore be randomly orientated with respect to the circumnuclear torus. Furthermore, we see no difference in the reddening between the two AGN types, indicating, like the 21 cm absorption, that the orientation of the torus has little bearing on this. We also find a correlation between 21 cm line strength and the optical-near-infrared color, which suggests that the reddening is caused by dust located in the large-scale, H I absorbing disk which intervenes the sight line to the AGN.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: kinematics and dynamics - quasars: absorption lines - radio lines: galaxies - ultraviolet: galaxies

Simbad objects: 95

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Number of rows : 95
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ICRF J000319.3+212944 Sy2 00 03 19.3504089696 +21 29 44.505854592   21.005 20.580 19.650   ~ 41 1
2 QSO B0023-263 BLL 00 25 49.1657525184 -26 02 12.888933288   20.30 19.5 18.084   ~ 151 1
3 ICRF J003820.5-020740 Sy1 00 38 20.5293186816 -02 07 40.539532008   19.04 18.02 17.6   ~ 216 1
4 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 247 1
5 NGC 612 Sy2 01 33 57.751 -36 29 35.80   13.90 13.15 12.33   ~ 207 0
6 QSO B0131-001 QSO 01 34 12.7041557 +00 03 45.138405   23.34 22.50 20.780   ~ 34 1
7 3C 49 rG 01 41 09.10 +13 53 28.0   22.327 20.920 20.876   ~ 179 1
8 QSO J0157-1043 QSO 01 57 41.6192171016 -10 43 40.965009312   17.32 17.09 17.039   ~ 74 1
9 ICRF J020157.1-113233 Sy1 02 01 57.1794759192 -11 32 33.435766068   16.54 16.40 16.073   ~ 205 1
10 7C 022118.10+273638.00 Sy1 02 24 12.2865158736 +27 50 11.538285648   19.502 18 18.263   ~ 205 1
11 QSO B0335-122 QSO 03 37 55.4513467728 -12 04 04.551994488   21.018 20.110 20.199   ~ 62 1
12 3C 93.1 BLL 03 48 46.9073426592 +33 53 15.461439576   20.723   19.110   ~ 128 1
13 QSO B0347-211 QSO 03 49 57.8274665712 -21 02 47.744524752   20.48 21.10 20.297   ~ 107 1
14 3C 99.0 Sy2 04 01 07.6 +00 36 33   20.200 19.010 18.532   ~ 104 1
15 ICRF J041045.6+765645 AGN 04 10 45.6108324 +76 56 45.313088   21 22.0 21.200   ~ 154 1
16 4C 05.19 QSO 04 14 37.7673624 +05 34 42.328449   24.100 23.800 21.270   ~ 344 2
17 PKS 0428+205 rG 04 31 03.7614907 +20 37 34.264207   22.174   19.085   ~ 177 1
18 ICRF J050321.1+020304 Sy2 05 03 21.1971480 +02 03 04.676648   22.500 21.350 20.682   ~ 182 1
19 ICRF J052109.8+163822 Sy1 05 21 09.8855216664 +16 38 22.054553988   19.37 18.84 18.480   ~ 805 1
20 QSO B0537-286 QSO 05 39 54.2815136376 -28 39 55.947762216   19.70 20.0 18.789   ~ 260 1
21 ICRF J054236.1+495107 Sy1 05 42 36.1380355416 +49 51 07.232213736   18.45 17.80 17.210   ~ 1389 1
22 [VV2006] J055652.6-024105 Sy2 05 56 52.6235409000 -02 41 05.530026696   20.968   19.533   ~ 31 1
23 2C 524 Sy2 06 09 32.701768 +48 04 17.04207   21.198 18.00 18.767   ~ 173 1
24 3C 173.1 rG 07 09 18.2015614632 +74 49 31.815420780   19.982 18.9 17.540   ~ 128 1
25 QSO B0723-007 BLL 07 25 50.6400080064 -00 54 56.546276580   17.39 16.57 15.82   ~ 237 1
26 ICRF J074110.7+311200 Sy1 07 41 10.7033429280 +31 12 00.230596416   17.02 16.89 16.322   ~ 428 1
27 3C 190 QSO 08 01 33.5525166480 +14 14 42.813906612   21.07 20.26 18.972   ~ 226 2
28 3C 196.1 AGN 08 15 27.825 -03 08 27.67   18.490 16.940 16.797   ~ 118 1
29 ICRF J083454.9+553421 Sy2 08 34 54.9022011432 +55 34 21.085082256   20.75 19.45 17.180   ~ 267 2
30 ICRF J084047.5+131223 Sy1 08 40 47.5881972768 +13 12 23.557974480   18.58 18.15 17.622   ~ 403 1
31 3C 213.1 AGN 09 01 05.2614565176 +29 01 46.939089828   18.84 18.08 18.600   ~ 120 1
32 NVSS J090530+340756 rG 09 05 30.1 +34 07 57   24.0 23.800 23.500   ~ 154 1
33 ICRF J090933.4+425346 Sy2 09 09 33.4981341384 +42 53 46.454750376   19.98 19.42 18.220   ~ 477 0
34 QSO J0913+5919 QSO 09 13 16.551 +59 19 21.68   24.96 23.32 24.948   ~ 55 0
35 [DVR2000] TN J0924-2201 rG 09 24 19.94 -22 01 42.2       25.850   ~ 82 0
36 ICRF J092703.0+390220 Sy1 09 27 03.0138528936 +39 02 20.850343332   17.17 17.00 16.486   ~ 959 1
37 3C 220.3 G 09 39 23.40 +83 15 26.2   20.5   20.140   ~ 88 1
38 ICRF J094336.9-081930 LIN 09 43 36.9444590 -08 19 30.818298   19.401   18.100   ~ 115 2
39 NVSS J095447+743556 rG 09 54 47.4427796 +74 35 57.144920       21.700   ~ 35 1
40 ICRF J103507.0+562846 Sy2 10 35 07.0400250 +56 28 46.795465   20.2 21.244 20.200   ~ 182 1
41 ICRF J112027.8+142054 G 11 20 27.80726 +14 20 54.9914   20 20.935 20.100   ~ 152 1
42 3C 258 rG 11 24 43.693 +19 19 28.11   22.082 21.448 20.513   ~ 84 1
43 Ton 599 QSO 11 59 31.8338889192 +29 14 43.826803116   14.80 14.41 17.652 13.39 ~ 851 1
44 2MASX J12054771+1651085 LIN 12 05 47.7089284392 +16 51 08.355094704   18.758   17.327   ~ 55 0
45 3C 268.3 Sy1 12 06 24.70656 +64 13 36.8760   21.847 20.790 19.910   ~ 184 1
46 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2229 3
47 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6271 0
48 QSO B1228-113 QSO 12 30 55.5556807872 -11 39 09.791771256   22.010   19.115   ~ 64 1
49 2E 2879 Sy1 12 52 26.3561235816 +56 34 19.573734864   18.42 18.11 17.660   ~ 279 2
50 PKS 1306-09 rG 13 08 39.1573432224 -09 50 32.424542340   20.767 20.500 18.439   ~ 72 1
51 ICRF J131337.8+545823 Sy2 13 13 37.85316548 +54 58 23.8993959     21.735 20.374   ~ 31 1
52 4C 32.44 QSO 13 26 16.5156056760 +31 54 09.481248180   21.367 19.822 18.882   ~ 163 1
53 ICRF J134733.3+121724 Sy2 13 47 33.3634536792 +12 17 24.214209216   19.28 18.44 15.718   ~ 555 3
54 QSO B1351-018 QSO 13 54 06.8955197160 -02 06 03.198962664   20.62 19.91 19.277   ~ 139 1
55 NVSS J135740+435400 rG 13 57 40.5921897 +43 53 59.769211     22.708 20.951   ~ 42 1
56 QSO B1356+022 QSO 13 59 27.1493947944 +01 59 54.561221808   17.95 17.63     ~ 97 1
57 ICRF J140028.6+621038 Sy2 14 00 28.6484960 +62 10 38.588791   22.137 20.373 19.530   ~ 168 1
58 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1097 2
59 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 405 1
60 3C 299 rG 14 21 05.6960 +41 44 49.260   20.496 19.330 18.560   ~ 179 1
61 8C 1443+773 Sy2 14 43 14.0 +77 07 28   19   18.730   ~ 143 1
62 QSO B1450-338 QSO 14 54 02.4751960728 -34 00 57.210016968   22.520 20.400 19.390   ~ 23 1
63 ICRF J150609.5+373051 Sy2 15 06 09.52996778 +37 30 51.1325044   21.2 21.2 20.60   ~ 167 1
64 QSO B1535+004 QSO 15 38 15.95307868 +00 19 05.3242162     18.80 18.8   ~ 33 0
65 4C 14.60 BLL 15 40 49.4896705848 +14 47 45.909368088   17.72 17.30 17.240   ~ 392 1
66 ICRF J154609.5+002624 Bla 15 46 09.5314561 +00 26 24.614551   19.730 18.900 19.5   ~ 78 1
67 QSO B1549-790 QSO 15 56 58.8747821520 -79 14 04.261412796   18.80 18.800 17.84   ~ 189 1
68 QSO B1615+028 QSO 16 17 49.9080413952 +02 46 43.107517308   17.59 17.67 17.310   ~ 75 1
69 [VV96] J162304.5+662401 QSO 16 23 04.5201307656 +66 24 01.069442928   19.477   17.430   ~ 58 1
70 4C 69.21 QSO 16 42 07.8484347528 +68 56 39.767837172   19.723   19.219   ~ 291 1
71 QSO J1658+0741 QSO 16 58 09.0115232160 +07 41 27.544209360   19.993 19.5 19.598   ~ 161 1
72 [VV96] J181536.8+612711 BLL 18 15 36.7922125728 +61 27 11.647037484   21.272   19.122   ~ 35 1
73 ICRF J181623.9+345745 Sy2 18 16 23.9007278160 +34 57 45.748786176   20.342   18.459   ~ 26 1
74 4C 39.56 Sy1 18 21 20.8979332560 +39 42 44.862056676   19.598   18.135   ~ 62 1
75 ICRF J182314.1+793849 Sy2 18 23 14.1015133920 +79 38 48.994631700   19.269 16.70 17.415   ~ 64 1
76 ICRF J182931.7+484446 Sy1 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 659 1
77 ICRF J183114.8+290710 Sy2 18 31 14.8601293 +29 07 10.294403   21.917 20.2 20.200   ~ 70 1
78 NVSS J184535+354116 rG 18 45 35.1088474 +35 41 16.726462   19.830   21.900   ~ 61 0
79 QSO B1937-1009 BLL 19 39 57.2566747152 -10 02 41.522299692   18.800 19.0 17.188   ~ 180 1
80 ICRF J194431.5+544807 BLL 19 44 31.5116147 +54 48 07.062154   21.732   18.591   ~ 67 1
81 QSO B1946+708 BLL 19 45 53.5247142432 +70 55 48.706796172   18.726 16.70 17.199   ~ 134 2
82 ICRF J202206.6+613658 Sy2 20 22 06.6835988160 +61 36 58.816893852     19.5 17.58   ~ 310 1
83 ICRF J205252.0+363535 Sy2 20 52 52.0549923 +36 35 35.300002   22.083   21.200   ~ 97 1
84 2MASX J21234458+2504272 Sy2 21 23 44.5778423928 +25 04 27.670672416   17.660 16.350     ~ 311 0
85 ICRF J213750.0-204231 Sy1 21 37 50.0031446184 -20 42 31.712827428   20.400 19.4 19.286   ~ 89 1
86 ICRF J215137.8+055212 Sy1 21 51 37.87549312 +05 52 12.9545524   23.700 22.050 20.850   ~ 109 1
87 BWE 2215+0205 QSO 22 17 48.2380277784 +02 20 10.766284044   21.840 20.420 20.140   ~ 54 1
88 3C 452 Sy2 22 45 48.7616172744 +39 41 15.906782184   17.60 16.56     ~ 355 1
89 2MASX J22502534+1419519 Sy1 22 50 25.3475290512 +14 19 52.095751140   17.28 16.97 17.243   ~ 198 1
90 3C 455.0 Sy2 22 55 03.9 +13 13 35   19.535 19.590 19.190   ~ 190 2
91 ICRF J230302.9-184125 Sy1 23 03 02.9760289032 -18 41 25.823118480   18.29 17.82 16.569   ~ 121 1
92 2C 1883 Sy2 23 16 35.1933566880 +04 05 18.297101076   17.54 16.68 17.220   ~ 284 1
93 3C 460 AGN 23 21 28.4 +23 46 48   20.315   18.468   ~ 87 2
94 ICRF J234403.7+822640 Sy2 23 44 03.8302221504 +82 26 40.345410408   21.769 20.5 20.220   ~ 93 1
95 ICRF J235509.4+495008 BLL 23 55 09.4576071696 +49 50 08.348530416   21.101   18.400   ~ 257 1

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2022.07.06-18:56:11

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