2001AJ....121.1927I

Query : 2001AJ....121.1927I

2001AJ....121.1927I - Astron. J., 121, 1927-1935 (2001/April-0)

Thermal infrared 3-5 micron colors of obscured and unobscured active galactic nuclei.

IMANISHI M.

Abstract (from CDS):

Thermal infrared photometry in the L and M' bands and L-M' colors of type 1 and type 2 active galactic nuclei (AGNs) are presented. After combining our observations with photometric data at similar wavelengths taken from the literature, we find that the excess of L-M' colors of type 2 AGNs (37 sources, 50 data points) relative to type 1 AGNs (27 sources, 36 data points), due to dust extinction, is statistically detectable but very small. We next investigate the L-M' colors of type 2 AGNs by separating less dust obscured type 2 AGNs and highly dust obscured type 2 AGNs. In both cases, the L-M' colors are similar to the intrinsic L-M' color of unobscured AGNs, and the L-M' color excess of the latter highly dust obscured type 2 AGNs, due to dust extinction, is much smaller than that expected from the Galactic dust extinction curve. Contamination from starbursts and the time lag of flux variation are unlikely to explain this small L-M' color excess, which is best explained if the dust extinction curve in the close vicinity of AGNs is fairly flat at 3-5 µm, as a result of a size increase of the absorbing dust grains through coagulation.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Nuclei - Infrared Radiation

Simbad objects: 89

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Number of rows : 89
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 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1344 0
2 2MASX J00215355-7910077 Sy2 00 21 53.5554103848 -79 10 08.025602016   17.33 16.3 15.19   ~ 82 0
3 NGC 262 Bla 00 48 47.14147900 +31 57 25.0845702 14.04 13.90 13.06 8.53   ~ 778 2
4 IRAS 00521-7054 Sy2 00 53 56.2229333640 -70 38 04.243791912 17.83 17.22 16.2 16.14 14.55 ~ 109 0
5 2C 94 Sy2 01 08 52.8701830824 +13 20 14.262799812   15.19       ~ 494 2
6 MCG-03-04-014 Sy1 01 10 08.92440 -16 51 09.7668   15   13.96   ~ 117 1
7 Mrk 1152 Sy1 01 13 50.0743327440 -14 50 44.359466892   15.80 15.00 9.9   ~ 121 0
8 ESO 113-45 Sy1 01 23 45.7631533440 -58 48 20.808928944   14.08 13.83 13.34   ~ 965 0
9 NGC 526 Sy2 01 23 54.3772245792 -35 03 55.710850788   14.76 14.60 13.46   ~ 354 2
10 NGC 520 AGN 01 24 35.07120 +03 47 32.6760 12.41 12.24 11.42     ~ 528 3
11 Z 459-57 Sy1 01 27 32.5217343720 +19 10 43.839069600   14.89 14.22     ~ 333 0
12 NGC 613 AGN 01 34 18.235 -29 25 06.56   10.77 12.71 9.50 10.6 ~ 446 3
13 NGC 660 Sy2 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 588 2
14 Z 386-35 Sy1 01 43 57.7777898304 +02 20 59.531401716   14.90 14.07     ~ 569 1
15 NGC 828 AGN 02 10 09.5469097104 +39 11 25.233638244   13.0       ~ 171 1
16 NGC 863 Sy2 02 14 33.5604714720 -00 46 00.181845336   14.48 13.81 17.9   ~ 770 0
17 3C 63 BLL 02 20 54.3166497648 -01 56 50.431204212           ~ 149 1
18 NGC 931 Sy1 02 28 14.4689104272 +31 18 41.469363324   15.71 14.74     ~ 426 1
19 NGC 1052 Bla 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1397 2
20 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
21 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
22 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1987 2
23 MCG+01-12-009 Bla 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 2099 2
24 NGC 1614 Sy1 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 697 1
25 UGC 3094 AGN 04 35 33.816 +19 10 18.24   16.5       ~ 77 1
26 IRAS 04385-0828 Sy1 04 40 54.9608896320 -08 22 22.126721232   15.71 14.5     ~ 128 0
27 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 756 3
28 Z 395-23 Sy1 05 16 11.4092471904 -00 08 59.157166920   14.30 13.92     ~ 953 1
29 IRAS 05189-2524 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 545 0
30 NGC 2110 Sy2 05 52 11.3768668776 -07 27 22.507465392   14.77 13.51 11.86   ~ 712 1
31 Z 232-3 Sy1 05 54 53.6080860768 +46 26 21.624853488   15.37 14.62     ~ 563 3
32 IRAS 05563-3820 Sy1 05 58 02.0566707456 -38 20 04.452162288   16.05 14.98 11.6   ~ 249 1
33 3C 171.0 Sy2 06 55 14.7385158451 +54 08 57.427918985   19.94 19.08     ~ 264 1
34 NGC 2339 H2G 07 08 20.5343958360 +18 46 48.812128644   12.3       ~ 150 1
35 NGC 2388 AGN 07 28 53.4535009080 +33 49 08.554343196   14.7       ~ 145 2
36 Z 235-30 Sy1 07 42 32.8210670808 +49 48 34.783809768   14.74 14.27     ~ 769 1
37 3C 195 Sy1 08 08 53.6297647896 -10 27 39.744541656   17.14 18 15.76   ~ 112 1
38 NGC 2623 LIN 08 38 24.016 +25 45 16.29 14.10 13.99 13.36     ~ 533 2
39 IRAS 08572+3915 LIN 09 00 25.38288 +39 03 54.2988     16.66     ~ 450 1
40 NGC 2782 Sy2 09 14 05.11967 +40 06 49.6800 12.29 12.30 11.63     ~ 494 3
41 3C 223.0 Sy2 09 39 52.7594046216 +35 53 58.922078496   19.51 18.60     ~ 279 0
42 4C 36.16 Rad 09 39 55.08 +35 52 13.4           ~ 271 1
43 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
44 MCG-05-23-016 Sy2 09 47 40.1332188528 -30 56 55.960779696   14.10 13.69 12.44   ~ 611 0
45 NGC 3094 G 10 01 25.9394231904 +15 46 12.175678236   13.5       ~ 124 1
46 7C 095855.9+290131 Sy2 10 01 49.5227371368 +28 47 08.943487440   18.21 17.27     ~ 447 1
47 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
48 NGC 3227 Sy1 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1807 2
49 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 392 1
50 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1638 0
51 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2270 1
52 NGC 4102 Sy2 12 06 23.11513 +52 42 39.4160   11.8       ~ 449 1
53 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3938 2
54 NGC 4194 rG 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 467 2
55 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 527 2
56 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
57 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2
58 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
59 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
60 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 1010 2
61 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
62 NGC 4968 Sy2 13 07 05.976 -23 40 37.34   13.78 14.79 12.46 12.78 ~ 198 2
63 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 514 1
64 PKS 1345+12 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 652 2
65 IC 4329A Sy1 13 49 19.2601801224 -30 18 34.213815504   13.81 13.66 12.18 12.35 ~ 876 1
66 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1331 1
67 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
68 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
69 3C 321 Sy1 15 31 43.46520 +24 04 18.9948   16.0   15.40   ~ 341 1
70 Mrk 290 Sy1 15 35 52.4031021552 +57 54 09.515660508   15.55 15.27     ~ 575 0
71 NGC 6764 LIN 19 08 16.4036066688 +50 55 59.519979084   15.00 14.32     ~ 307 1
72 NGC 6814 Sy1 19 42 40.5862186152 -10 19 25.108718844   15.33 14.21 11.7 11.3 ~ 866 0
73 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
74 IRAS 20460+1925 Sy1 20 48 17.2470227976 +19 36 55.956994560   13.93       ~ 76 0
75 NGC 7130 Sy2 21 48 19.5412287192 -34 57 04.492024884   12.86 13.87 11.57   ~ 483 1
76 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 572 2
77 LEDA 68751 Sy1 22 23 49.5398449645 -02 06 12.856394895   16.93 15.77 16.02   ~ 511 2
78 NGC 7314 Sy2 22 35 46.1985355872 -26 03 01.564993476   11.62 13.11 10.61 11.4 ~ 601 0
79 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2253 3
80 MCG-02-58-022 Sy1 23 04 43.4776098480 -08 41 08.629476864   16.20 15.91 9.4   ~ 481 1
81 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 783 2
82 3C 456 Sy2 23 12 28.0711694296 +09 19 26.469101543   18.54       ~ 116 2
83 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3
84 NGC 7674 Sy1 23 27 56.6973043968 +08 46 44.253707772 13.84 13.92 13.23 12.64   ~ 738 2
85 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
86 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0
87 NGC 7770 GiG 23 51 22.610 +20 05 48.56   14.5       ~ 106 1
88 NGC 7771 GiG 23 51 24.880 +20 06 42.57 13.42 13.08 12.25     ~ 350 3
89 Z 455-59 AGN 23 51 26.731 +20 35 10.22   14.9       ~ 237 0

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