1999ApJ...522..157R

Query : 1999ApJ...522..157R

1999ApJ...522..157R - Astrophys. J., 522, 157-164 (1999/September-1)

The distribution of absorbing column densities among Seyfert 2 galaxies.

RISALITI G., MAIOLINO R. and SALVATI M.

Abstract (from CDS):

We use hard X-ray data for an ``optimal'' sample of Seyfert 2 galaxies to derive the distribution of the gaseous absorbing column densities among obscured active nuclei in the local universe. Of all Seyfert 2 galaxies in the sample, 75% are heavily obscured (NH>1023 cm–2), and about half are Compton thick (NH>1024 cm–2). Intermediate type 1.8-1.9 Seyfert galaxies are characterized by an average NH much lower than ``strict'' Seyfert 2 galaxies. No correlation is found between NH and the intrinsic luminosity of the nuclear source. This NH distribution has important consequences for the synthesis of the cosmic X-ray background. In addition, the large fraction of Compton-thick objects implies that most of the obscuring gas is located within a radius of a few 10 pc from the nucleus.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Nuclei - Galaxies: Seyfert - X-Rays: Galaxies

CDS comments: t.1 : IRS 07145 and 11215 are IRAS 07145-2914 and IRAS 11215-2806

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 - 2026 		#notes
1 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
2 NGC 513 Sy2 01 24 26.8053520680 +33 47 58.224514236   13.4 13.40     ~ 201 1
3 NGC 676 Sy2 01 48 57.3181010544 +05 54 27.069537204     12     ~ 106 2
4 NGC 788 Sy2 02 01 06.4628889816 -06 48 57.149808084   13.71 12.76 11.79   ~ 291 0
5 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
6 NGC 1058 Sy2 02 43 30.0264850248 +37 20 28.782851784   12.29 11.75 10.85   ~ 483 0
7 Z 524-40 Sy2 02 59 58.5970307633 +36 49 13.808979663   14.89 13.96     ~ 369 1
8 NGC 1167 LIN 03 01 42.3322774176 +35 12 20.300948892   13.84 12.77     ~ 382 1
9 MCG+06-07-034 rG 03 01 51.4 +35 50 23           ~ 179 1
10 NGC 1241 Sy2 03 11 14.6195456232 -08 55 18.775959888 12.07 12.84 11.99 12.7 12.5 ~ 221 2
11 Z 540-64 Sy2 03 15 01.4292441960 +42 02 08.825019072   15.05 14.18 12.54   ~ 202 1
12 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
13 NGC 1320 Sy2 03 24 48.6886857672 -03 02 32.121533436   14.0 14.00     ~ 317 0
14 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1987 2
15 NGC 1358 Sy2 03 33 39.6807616872 -05 05 22.213915692   14.10 13.05 11.76   ~ 220 1
16 NGC 1386 Sy1 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 553 1
17 NGC 1433 Sy2 03 42 01.4847418992 -47 13 18.929092656   10.84 9.99 9.61 10.2 ~ 447 0
18 NGC 1667 Sy2 04 48 37.1804579280 -06 19 11.824427712   13.66 12.86 11.72   ~ 384 2
19 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3
20 NGC 2110 Sy2 05 52 11.3768668776 -07 27 22.507465392   14.77 13.51 11.86   ~ 712 1
21 NGC 2273 Sy1 06 50 08.6691789600 +60 50 44.864645136   14.50 13.54     ~ 566 2
22 MCG-05-18-002 Sy2 07 16 31.2062162520 -29 19 28.882826364   13.28 13.52 11.61   ~ 288 4
23 NGC 2639 Sy2 08 43 38.0682469032 +50 12 19.942091604 12.90 12.56 11.65     ~ 451 2
24 NGC 2655 Sy2 08 55 37.731 +78 13 23.10   12.03 11.08     ~ 318 2
25 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
26 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
27 NGC 3081 Sy2 09 59 29.5437024336 -22 49 34.747341960   13.06 13.55 11.67 12.1 ~ 509 0
28 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
29 IC 2560 Sy2 10 16 18.7073057664 -33 33 49.720274676   12.53 13.31 11.25 12.2 ~ 283 1
30 NGC 3147 Sy2 10 16 53.6388580752 +73 24 02.641798224   11.43 10.61     ~ 533 2
31 NGC 3185 Sy2 10 17 38.5650471192 +21 41 17.573817228   12.99 12.17 12.37   ~ 308 1
32 NGC 3254 Sy2 10 29 19.922 +29 29 29.18   12.29 11.60     ~ 208 0
33 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
34 NGC 3362 Sy2 10 44 51.7308466464 +06 35 48.665072040   17.58 16.96     ~ 162 1
35 NGC 3393 Sy2 10 48 23.4653152920 -25 09 43.487648784   13.10 13.95 11.67 12.2 ~ 471 1
36 NGC 3486 Sy2 11 00 23.946 +28 58 29.35 10.89 11.11 10.53 10.40   ~ 373 1
37 IRAS 11215-2806 Sy2 11 24 02.7219289536 -28 23 15.489126168   15.7       ~ 71 0
38 NGC 3735 Sy2 11 35 57.2748856320 +70 32 07.951921080   12.4       ~ 202 2
39 NGC 3786 Sy2 11 39 42.5121341928 +31 54 33.971791752   14.62 13.74     ~ 413 1
40 APG 294 GrG 11 39.7 +31 55           ~ 260 0
41 NGC 3941 Sy2 11 52 55.3609498656 +36 59 10.716212904   11.45 11.62 9.97   ~ 261 0
42 NGC 3976 Sy2 11 55 57.2734729464 +06 44 57.420193308   12.8       ~ 146 0
43 NGC 3982 Sy2 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 588 1
44 NGC 4138 Sy2 12 09 29.8011417048 +43 41 06.864140004 12.46 12.29 11.32 10.82   ~ 436 1
45 NGC 4168 Sy2 12 12 17.2692381408 +13 12 18.688208724 12.58 12.11 11.18     ~ 393 1
46 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
47 NGC 4378 Sy2 12 25 18.1024266072 +04 55 30.485595360   14.51 13.49     ~ 251 0
48 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
49 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
50 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
51 NGC 4477 Sy2 12 30 02.1955766304 +13 38 11.543715888 11.98 11.38 10.42     ~ 419 2
52 M 88 Sy2 12 31 59.1525062448 +14 25 13.148971824   14.33 13.18     ~ 843 1
53 NGC 4507 Sy2 12 35 36.6338976888 -39 54 33.710416272   12.95 13.54 11.70 12.4 ~ 532 1
54 NGC 4565 Sy2 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 991 0
55 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2
56 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
57 IC 3639 Sy1 12 40 52.8344884344 -36 45 21.057011172   13.01 13.50 11.87 12.7 ~ 262 1
58 NGC 4639 Sy1 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 642 0
59 NGC 4698 Sy2 12 48 22.9082830584 +08 29 14.667552276   13.24 12.27     ~ 507 0
60 NGC 4725 Sy2 12 50 26.5716367992 +25 30 02.733090588   13.45 12.44     ~ 727 2
61 NGC 4785 Sy2 12 53 27.3416048448 -48 44 57.213423456   13.22 12.09 12.8 12.5 ~ 75 0
62 NGC 4941 Sy2 13 04 13.1036380320 -05 33 05.752803672   13.18 12.23 10.74   ~ 410 0
63 NGC 4939 Sy2 13 04 14.3280524928 -10 20 22.300454724   14.81 13.80 10.92   ~ 332 1
64 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
65 NGC 5005 LIN 13 10 56.312 +37 03 32.19   14.67 13.67     ~ 567 2
66 NGC 5033 Sy2 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 909 1
67 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
68 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 500 1
69 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
70 NGC 5273 Sy1 13 42 08.3801616672 +35 39 15.467518836   14.01 13.12     ~ 510 0
71 NGC 5347 Sy2 13 53 17.7984934128 +33 29 27.011618196   13.46 12.70     ~ 373 1
72 APG 271 IG 14 03 25.45 -06 02 59.9           ~ 209 0
73 NGC 5427 Sy1 14 03 26.0408044536 -06 01 50.682790236   14.67 13.96 11.54   ~ 307 0
74 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1331 1
75 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
76 NGC 5643 Sy2 14 32 40.778 -44 10 28.60   11.03 13.60 9.92 10.6 ~ 652 1
77 NGC 5674 Sy2 14 33 52.2788150880 +05 27 30.117378924   13.7 13.70     ~ 197 0
78 NGC 5728 Sy2 14 42 23.8918506576 -17 15 11.240783784   14.34 13.40     ~ 679 1
79 NGC 5899 Sy2 15 15 03.252 +42 02 59.47   14.19 13.21     ~ 219 0
80 NGC 5953 Sy2 15 34 32.40240 +15 11 37.7990   13.23 12.45     ~ 389 1
81 NGC 6221 Sy2 16 52 46.329 -59 13 00.99   10.90 13.45 9.68 10.4 ~ 328 0
82 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 478 1
83 FRL 49 Sy2 18 36 58.2335883144 -59 24 08.282326320   11.1   14.19   ~ 270 1
84 NGC 6890 Sy2 20 18 18.1057797216 -44 48 24.750633168   13.06 14.02 11.57   ~ 171 0
85 IC 5063 Bla 20 52 02.15 -57 04 06.7   12.92 13.60 11.30   ~ 710 1
86 NGC 7130 Sy2 21 48 19.5412287192 -34 57 04.492024884   12.86 13.87 11.57   ~ 483 1
87 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 572 2
88 NGC 7314 Sy2 22 35 46.1985355872 -26 03 01.564993476   11.62 13.11 10.61 11.4 ~ 601 0
89 NGC 7410 Sy2 22 55 00.8670520224 -39 39 40.773846240   11.35 11.80 9.91   ~ 113 0
90 NGC 7465 Sy2 23 02 00.9603717552 +15 57 53.236032120   13.3       ~ 333 0
91 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 783 2
92 NGC 7496 Sy2 23 09 47.2876854912 -43 25 40.279652796   11.92 13.90 10.95 11.5 ~ 350 1
93 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3
94 NGC 7590 Sy1 23 18 54.7949760192 -42 14 20.515300476   12.12 13.76 11.06 11.8 ~ 290 1
95 NGC 7743 Sy2 23 44 21.1607807112 +09 56 02.970989664   14.19 13.28     ~ 334 0

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