2009MNRAS.399..944M


Query : 2009MNRAS.399..944M

2009MNRAS.399..944M - Mon. Not. R. Astron. Soc., 399, 944-951 (2009/October-3)

The fraction of compton-thick sources in an INTEGRAL complete AGN sample.

MALIZIA A., STEPHEN J.B., BASSANI L., BIRD A.J., PANESSA F. and UBERTINI P.

Abstract (from CDS):

We study the NH distribution in a complete sample of 88 active galactic nuclei (AGN) selected in the 20-40 keV band from INTEGRAL/Imager on Board the Integral Satellite (IBIS) observations. We find that the fraction of absorbed (NH≥ 1022cm2) sources is 43 per cent while the Compton thick AGN comprise 7 per cent of the sample. While these estimates are fully compatible with previous soft gamma-ray surveys, they would appear to be in contrast with results reported by Risaliti, Maiolino & Salvati using an optically selected sample. This apparent difference can be explained as being due to a selection bias caused by the reduction in high energy flux in Compton thick objects rendering them invisible at our sensitivity limit. Taking this into account, we estimate that the fraction of highly absorbed sources is actually in close agreement with the optically selected sample. Furthermore, we show that the measured fraction of absorbed sources in our sample decreases from 80 to ∼20-30 per cent as a function of redshift with all Compton thick AGN having z ≤ 0.015. If we limit our analysis to this distance and compare only the type 2 objects in our sample with the Risaliti et al. objects below this redshift value, we find a perfect match to their NHdistribution. We conclude that in the low-redshift bin we are seeing almost the entire AGN population, from unabsorbed to at least mildly Compton thick objects, while in the total sample we lose the heavily absorbed `counterparts' of distant and therefore dim sources with little or no absorption. Taking therefore this low z bin as the only one able to provide the `true' distribution of absorption in types 1 and 2 AGN, we estimate the fraction of Compton thick objects to be ≥24 per cent.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: active - galaxies: nuclei - X-rays: galaxies

Simbad objects: 88

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Number of rows : 88
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASX J00331831+6127433 Sy1 00 33 18.3489511673 +61 27 43.127876533           ~ 33 3
2 QSO B0033+595 BLL 00 35 52.554 +59 50 04.19     19.5 17.2   ~ 144 2
3 NGC 788 Sy2 02 01 06.4622976350 -06 48 57.146217363   13.71 12.76 11.79   ~ 220 0
4 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4225 2
5 ICRF J024457.6+622806 Sy1 02 44 57.6968650655 +62 28 06.517178768   12.15 12.19     ~ 259 1
6 NGC 1142 Sy2 02 55 12.229 -00 11 00.77   15.42 14.41     ~ 301 1
7 B3 0309+411B AGN 03 13 02 +41 20.0           ~ 19 0
8 2MASS J03181753-0017502 QSO 03 18 17.54 -00 17 50.2           ~ 8 0
9 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3664 3
10 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 876 1
11 2MASX J04520479+4932446 Sy1 04 52 04.7737592166 +49 32 44.738797125     17.1     ~ 57 0
12 2E 1228 Sy1 05 10 45.5390847005 +16 29 58.176227369   15.6 15.774     ~ 96 1
13 UGC 3374 Sy1 05 54 53.6085733702 +46 26 21.625853190   15.37 14.62     ~ 478 2
14 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 867 3
15 IC 450 Sy1 06 52 12.32333 +74 25 37.2376   15.16 14.19     ~ 517 1
16 2MASX J07561963-4137420 Sy2 07 56 19.636 -41 37 42.07           ~ 42 1
17 2MASS J07594181-3843560 Sy1 07 59 41.8249712970 -38 43 56.041977918           ~ 51 0
18 ESO 209-12 Sy1 08 01 57.9736077076 -49 46 42.394360438   15.31 15.3 13.78   ~ 67 0
19 FRL 1146 Sy1 08 38 30.7758950092 -35 59 33.325515213   16.1       ~ 68 0
20 4C 71.07 QSO 08 41 24.36526906 +70 53 42.1730054     16.5 16.8   ~ 713 1
21 [VV96] J091609.5-621929 Sy1 09 16 09.3662174299 -62 19 29.559790552   12.51 12.26 11.5   ~ 113 0
22 ESO 434-40 Sy2 09 47 40.1345889569 -30 56 55.959492708   14.10 13.69 12.44   ~ 501 0
23 SWIFT J0952.3-6234 Sy1 09 52 20.7 -62 32 37           ~ 26 0
24 ESO 263-13 Sy2 10 09 48.1881615625 -42 48 40.538299552   14.94 14.95 13.29   ~ 88 0
25 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 330 0
26 2MASX J10384520-4946531 Sy1 10 38 45.205 -49 46 53.19           ~ 43 0
27 2MASX J10402231-4625264 Sy2 10 40 22.313 -46 25 26.45   16.8       ~ 67 0
28 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1511 0
29 2MASX J12024767-5350082 Sy2 12 02 47.6225970101 -53 50 07.801488651   17.3       ~ 63 0
30 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3463 2
31 4C 04.42 QSO 12 22 22.54962080 +04 13 15.7761797   17.88 17.98 17.06   ~ 265 1
32 Mrk 50 Sy1 12 23 24.1368239628 +02 40 44.452269820   17.25 16.63     ~ 200 0
33 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1229 2
34 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5458 1
35 NGC 4507 Sy2 12 35 36.6328010225 -39 54 33.661858548   12.95 13.54 11.70 12.4 ~ 452 0
36 2MASX J12390630-1610472 Sy2 12 39 06.2810518255 -16 10 47.227607708           ~ 79 0
37 NGC 4593 Sy1 12 39 39.4435521178 -05 20 39.035028119   13.95 13.15     ~ 979 0
38 2MASX J12412572-5750038 Sy2 12 41 25.7672413457 -57 50 03.481040498   17.4 16.9     ~ 62 0
39 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2800 2
40 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1322 2
41 NGC 4992 Sy2 13 09 05.596 +11 38 02.85   14.6       ~ 101 0
42 SWIFT J1310.9-5553 Sy1 13 10 43.3 -55 52 11           ~ 33 0
43 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4110 3
44 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1407 0
45 NGC 5252 Sy2 13 38 15.8711551761 +04 32 33.525903711   15.21 14.21     ~ 441 0
46 2MASS J13473599-6037037 Sy1 13 47 36.00 -60 37 03.8         16.77 ~ 84 0
47 ESO 445-50 Sy1 13 49 19.2607281800 -30 18 34.224136831   13.81 13.66 12.18   ~ 747 0
48 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1050 2
49 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 1019 0
50 ESO 511-30 Sy1 14 19 22.4042606652 -26 38 41.130443100   13.32 14.9 12.27 12.7 ~ 124 0
51 2MASX J14513316-5540388 Sy2 14 51 33.1404068790 -55 40 38.324487885           ~ 36 0
52 IC 4518A Sy2 14 57 40.5 -43 07 54   16.64   13.74   ~ 81 0
53 2MASS J16014823-6108547 Sy2 16 01 48.2168030726 -61 08 54.618461752   16.8       ~ 23 0
54 2MASX J16115141-6037549 Sy1 16 11 51.3948387867 -60 37 55.024931046   14.7       ~ 60 0
55 2MASX J16183642-5927175 Sy1 16 18 36.4603086656 -59 27 17.279026359           ~ 49 0
56 ESO 137-34 Sy2 16 35 14.114 -58 04 48.10   12.20   10.84 11.6 ~ 116 0
57 2MASX J16383091-2055246 Sy1 16 38 30.9119540441 -20 55 24.562939907   16.88   15.13   ~ 43 0
58 IGR J16426+6536 Sy1 16 43 04.0290445576 +65 32 50.852117397   19.5   18.9   ~ 16 0
59 2MASX J16481523-3035037 Sy1 16 48 15.238 -30 35 03.78     15.8     ~ 57 0
60 2MASS J16560561-5203408 Sy1 16 56 05.6063438033 -52 03 40.853827248           ~ 47 0
61 2MASS J16561677-3302127 QSO 16 56 16.78 -33 02 12.7   18.4 17.8 17.5   ~ 65 0
62 NGC 6300 Sy2 17 16 59.473 -62 49 13.98   10.88 13.08 9.44 10.2 ~ 375 0
63 Granat 1734-292 Sy1 17 37 28.3805413653 -29 08 02.116025925           ~ 121 0
64 2E 3933 Sy1 17 41 55.2532168295 -12 11 56.587824725   17.36 16.40 14.9   ~ 53 0
65 2MASS J17485512-3254521 Sy1 17 48 55.13 -32 54 52.1           ~ 42 0
66 2MASS J17511362-2012145 Sy1 17 51 13.6163988533 -20 12 14.610272343           ~ 26 0
67 2MASXI J1802473-145454 Sy1 18 02 47.3 -14 54 55   19.3       ~ 50 2
68 [KRL2007b] 317 Sy1 18 24 55.9 -32 42 57           ~ 30 2
69 2MASS J18255759-0710229 Sy1 18 25 57.59 -07 10 23.0           ~ 30 0
70 QSO B1830-211 Bla 18 33 39.92 -21 03 39.9     18.70 21   ~ 575 1
71 ESO 103-35 Sy2 18 38 20.3207055742 -65 25 39.142872479   14.75 14.53 13.24   ~ 286 0
72 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1235 0
73 2MASX J18560128+1538059 Sy1 18 56 01.282 +15 38 05.90     18.4 16.6   ~ 43 0
74 6dFGS gJ193733.0-061305 Sy1 19 37 33.0246221231 -06 13 04.813344527   16.12 15.35 8.8   ~ 129 1
75 NGC 6814 Sy1 19 42 40.5857305428 -10 19 25.102133898   15.33 14.21 11.7 11.3 ~ 739 0
76 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2177 2
77 MSX6C G078.0875+02.6408 Sy2 20 18 38.5 +40 41 00           ~ 12 0
78 4C 74.26 Sy1 20 42 37.3081453418 +75 08 02.444858560     14.46 13.80   ~ 221 0
79 2MASX J21140128+8204483 Sy1 21 14 01.1716311384 +82 04 48.338015583           ~ 113 1
80 4C 50.55 Sy1 21 24 39.4 +50 58 25           ~ 86 1
81 IRAS 21262+5643 Sy1 21 27 45.3943647524 +56 56 34.913660916       16.6   ~ 134 0
82 2MASX J21355399+4728217 Sy1 21 35 54.0198492441 +47 28 21.899303833     16.30 13.2   ~ 39 0
83 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15   ~ 483 1
84 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2067 1
85 NAME MR 2251-178 Sy1 22 54 05.8858021308 -17 34 55.403006841   14.99 14.36 15.12   ~ 386 3
86 Mrk 926 Sy1 23 04 43.4773393553 -08 41 08.632325890   16.20 15.91 9.4   ~ 409 0
87 2MASX J23303771+7122464 Sy2 23 30 37.6725208828 +71 22 46.588937561   17.1   14.2   ~ 34 0
88 2MASS J23522211+5845307 Sy2 23 52 22.1740391638 +58 45 30.858849468   19.7   18.5   ~ 23 0

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2021.08.02-13:39:18

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