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 - 2024 		#notes
1 2MASS J00331833+6127432 Sy2 00 33 18.3513283032 +61 27 43.127622792           ~ 44 3
2 QSO B0033+595 BLL 00 35 52.554 +59 50 04.19     19.5 17.2   ~ 180 2
3 NGC 788 Sy2 02 01 06.4628889816 -06 48 57.149808084   13.71 12.76 11.79   ~ 266 0
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4623 2
5 ICRF J024457.6+622806 Sy1 02 44 57.6967097952 +62 28 06.517098084   12.15 12.19     ~ 291 1
6 NGC 1142 Sy2 02 55 12.2311509144 -00 11 00.807149472   15.42 14.41     ~ 332 1
7 ICRF J031301.9+412001 Sy1 03 13 01.96212044 +41 20 01.1834497   18.0   14.59   ~ 168 1
8 2MASS J03181753-0017502 QSO 03 18 17.54 -00 17 50.2           ~ 9 0
9 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4026 4
10 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 957 2
11 LEDA 168563 Sy1 04 52 04.7723618832 +49 32 44.750794344     17.1     ~ 71 0
12 Z 469-3 Sy1 05 10 45.5396425152 +16 29 58.180436556   15.6 15.774     ~ 121 1
13 UGC 3374 Sy1 05 54 53.6080860768 +46 26 21.624853488   15.37 14.62     ~ 526 2
14 Mrk 3 Sy2 06 15 36.2812259376 +71 02 14.837219808 14.21 14.03 12.97     ~ 920 3
15 IC 450 Sy1 06 52 12.3346265592 +74 25 37.121227716   15.16 14.19     ~ 575 1
16 LEDA 3097174 Sy2 07 56 19.636 -41 37 42.07           ~ 61 1
17 2MASS J07594181-3843560 Sy1 07 59 41.8249527816 -38 43 56.041748544           ~ 64 0
18 ESO 209-12 Sy1 08 01 57.9725354376 -49 46 42.395213028   15.31 15.3 13.78   ~ 82 1
19 FRL 1146 Sy2 08 38 30.7755130968 -35 59 33.333870984   16.1       ~ 90 1
20 4C 71.07 Bla 08 41 24.36528508 +70 53 42.1730435     17.30 16.8   ~ 782 1
21 [VV96] J091609.5-621929 Sy1 09 16 09.3662148312 -62 19 29.562130128   12.51 12.26 11.5   ~ 144 0
22 ESO 434-40 Sy2 09 47 40.1332188528 -30 56 55.960779696   14.10 13.69 12.44   ~ 558 0
23 CXO J095220.1-623234 Sy2 09 52 20.7 -62 32 37           ~ 34 0
24 ESO 263-13 Sy2 10 09 48.1876712664 -42 48 40.530472560   14.94 14.95 13.29   ~ 105 1
25 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 367 1
26 LEDA 5061286 Sy1 10 38 45.1668864264 -49 46 53.678789724           ~ 56 0
27 LEDA 93974 Sy2 10 40 22.313 -46 25 26.45   16.8       ~ 88 1
28 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1658 1
29 LEDA 38038 Sy2 12 02 47.6234151336 -53 50 07.791323712   17.3       ~ 80 0
30 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3711 2
31 ICRF J122222.5+041315 Sy1 12 22 22.54962606 +04 13 15.7760715   17.88 17.98 17.06   ~ 328 1
32 Mrk 50 Sy1 12 23 24.1362367968 +02 40 44.449405212   17.25 16.63     ~ 233 0
33 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1355 2
34 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5823 2
35 NGC 4507 Sy2 12 35 36.6338976888 -39 54 33.710416272   12.95 13.54 11.70 12.4 ~ 499 1
36 LEDA 170194 Sy2 12 39 06.2809500480 -16 10 47.224169760           ~ 103 1
37 NGC 4593 Sy1 12 39 39.4435107024 -05 20 39.034988448   13.95 13.15     ~ 1096 0
38 LEDA 166252 Sy2 12 41 25.7671390632 -57 50 03.479672436   17.4 16.9     ~ 79 0
39 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3062 2
40 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1483 2
41 NGC 4992 Sy2 13 09 05.5929226104 +11 38 02.824910124   14.6       ~ 126 0
42 ICRF J131043.3-555211 Sy1 13 10 43.35564793 -55 52 11.5298235           ~ 44 1
43 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4507 3
44 ESO 383-35 Sy1 13 35 53.7691256160 -34 17 44.160716796   13.89 13.61 8.9   ~ 1491 0
45 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 483 1
46 2MASS J13473599-6037037 Sy2 13 47 36.00 -60 37 03.8         16.77 ~ 98 0
47 ESO 445-50 Sy1 13 49 19.2601801224 -30 18 34.213815504   13.81 13.66 12.18 12.35 ~ 809 1
48 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1228 2
49 NGC 5506 Sy2 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1097 1
50 ESO 511-30 Sy1 14 19 22.4047231584 -26 38 41.134476084   13.32 14.9 12.27 12.7 ~ 154 0
51 LEDA 3079667 Sy2 14 51 33.1399230504 -55 40 38.331391008           ~ 49 0
52 IC 4518A Sy2 14 57 41.18 -43 07 55.6   16.64   13.74   ~ 119 0
53 2MASS J16014823-6108547 Sy2 16 01 48.2218659744 -61 08 54.630327732   16.8       ~ 29 0
54 LEDA 2793282 Sy1 16 11 51.3943954128 -60 37 55.030263996   14.7       ~ 78 0
55 LEDA 3078020 Sy1 16 18 36.4604121432 -59 27 17.275541472           ~ 60 0
56 ESO 137-34 Sy2 16 35 14.114 -58 04 48.10   12.20   10.84 11.6 ~ 143 0
57 LEDA 835095 Sy1 16 38 30.9120796728 -20 55 24.564701892   16.88   15.13   ~ 55 0
58 IGR J16426+6536 Sy1 16 43 04.0329936000 +65 32 50.902391940   19.5   18.9   ~ 19 0
59 IGR J16482-3036 Sy1 16 48 15.2500861368 -30 35 04.107778980           ~ 73 1
60 2MASS J16560561-5203408 Sy1 16 56 05.6062967232 -52 03 40.854141144           ~ 62 0
61 2MASS J16561677-3302127 Bla 16 56 16.78 -33 02 12.7   18.4 17.8 17.5   ~ 82 0
62 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 436 1
63 Granat 1734-292 Sy2 17 37 28.3811310912 -29 08 02.119558272           ~ 145 1
64 2MASS J17415525-1211566 Sy1 17 41 55.2532659480 -12 11 56.583631680   17.36 16.40 14.9   ~ 68 0
65 2MASS J17485512-3254521 Sy2 17 48 55.13 -32 54 52.1           ~ 55 0
66 2MASS J17511362-2012145 Sy1 17 51 13.6203430728 -20 12 14.580679392           ~ 33 0
67 IGR J18027-1455 Sy1 18 02 47.3 -14 54 55   19.3       ~ 68 2
68 [KRL2007b] 317 Sy1 18 24 56.6 -32 43 00           ~ 39 2
69 2MASS J18255759-0710229 Sy2 18 25 57.59 -07 10 23.0           ~ 40 0
70 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 679 1
71 ESO 103-35 Sy2 18 38 20.3204821536 -65 25 39.141804936   14.75 14.53 13.24   ~ 318 0
72 ICRF J184208.9+794617 Sy1 18 42 08.9904975672 +79 46 17.127835104   16.06 15.38     ~ 1321 1
73 2MASX J18560128+1538059 Sy1 18 56 01.282 +15 38 05.90     18.4 16.6   ~ 56 0
74 LEDA 90334 Sy1 19 37 33.0247353552 -06 13 04.809737748   16.12 15.35 8.8   ~ 165 2
75 NGC 6814 Sy1 19 42 40.5862186152 -10 19 25.108718844   15.33 14.21 11.7 11.3 ~ 812 0
76 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2381 2
77 MSX6C G078.0875+02.6408 Sy2 20 18 38.5 +40 41 00           ~ 15 0
78 ICRF J204237.3+750802 Sy1 20 42 37.3079247456 +75 08 02.445851940     14.46 13.80   ~ 258 1
79 ICRF J211401.1+820448 Sy1 21 14 01.1713534464 +82 04 48.340509096           ~ 132 1
80 GT 2122+507 Sy2 21 24 39.3723318183 +50 58 25.814349399           ~ 106 1
81 IRAS 21262+5643 Sy1 21 27 45.3941483856 +56 56 34.915920720       16.6   ~ 162 0
82 2MASS J21355401+4728218 Sy1 21 35 54.0201149472 +47 28 21.891328284     16.30 13.2   ~ 56 0
83 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 535 2
84 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2270 1
85 NAME MR 2251-178 Sy1 22 54 05.8858611984 -17 34 55.402233708   14.99 14.36 15.12   ~ 437 4
86 Mrk 926 Sy1 23 04 43.4776098480 -08 41 08.629476864   16.20 15.91 9.4   ~ 458 1
87 LEDA 2742800 Sy2 23 30 37.6725928920 +71 22 46.589073312   17.1   14.2   ~ 52 0
88 2MASS J23522211+5845307 Sy2 23 52 22.1725943448 +58 45 30.887173008   19.7   18.5   ~ 31 0

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