1994A&A...291...74P


Query : 1994A&A...291...74P

1994A&A...291...74P - Astronomy and Astrophysics, volume 291, 74-88 (1994/11-1)

Systematic study of the ultraviolet variability of active galactic nuclei.

PALTANI S. and COURVOISIER T.J.-L.

Abstract (from CDS):

We have analysed all spectra of all active galactic nuclei (AGN) observed with the IUE satellite during the period 1978-1991. 90% of the 93 objects for which an estimate of the variability can be obtained have varied by more than 15% in the ultraviolet domain. In almost all objects the flux variations are more important at 1200 A (mean of 39%) than at 3200A (mean of 21%). Rather small differences are found between the different classes of objects. In particular, the dispersions of the variability parameters in each class of objects are larger than the class-to-class differences. No difference can be settled between the variability properties of the radio-quiet and radio-loud quasars. We found however that the BL Lac objects have a larger fraction of high-variability objects than the other objects. All classes of objects present an increase of variability towards short wavelengths. We found no strong connections between the variability properties and the other observational parameters of the objects, like flux, redshift, luminosity or ultraviolet spectral index. Nevertheless we are able to put some constraints on the existing models. The models based on independent events with the same luminosity are ruled out. The variability is also anticorrelated to the luminosity in the Seyfert-like objects.

Abstract Copyright:

Journal keyword(s): ultraviolet: galaxies - galaxies: active - quasars: general - BL Lacertae objects: general - galaxies: Seyfert

Simbad objects: 92

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Number of rows : 92
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 Mrk 335 Sy1 00 06 19.5371542746 +20 12 10.617456059   14.19 13.85     ~ 1144 0
2 Mrk 1501 Sy1 00 10 31.0058529490 +10 58 29.505989476   15.96 15.40 12.22   ~ 660 0
3 LEDA 1790 Sy1 00 29 13.7012280721 +13 16 03.946876800   15.70 15.41     ~ 405 0
4 87GB 004432.0+030343 Sy1 00 47 05.9186400186 +03 19 54.785770057   16.2 16.37     ~ 140 2
5 Mrk 1502 Sy1 00 53 34.9326560879 +12 41 35.927159668   14.41 14.03     ~ 1071 1
6 Z 385-82 Sy1 01 21 59.8142301684 -01 02 24.373963458   17.04 16.78 11.0   ~ 140 0
7 ESO 113-45 Sy1 01 23 45.7630391439 -58 48 20.811630442   14.08 13.83 13.34   ~ 795 0
8 Mrk 359 Sy1 01 27 32.5219447154 +19 10 43.837247537   14.89 14.22     ~ 286 0
9 QSO J0217+0144 QSO 02 17 48.9547510 +01 44 49.698899   16.74 16.09 18.51 13.29 ~ 387 1
10 3C 66A BLL 02 22 39.6111630878 +43 02 07.797284539   15.71 15.21 14.5   ~ 818 1
11 NGC 985 Sy1 02 34 37.882 -08 47 17.02   14.64 14.28 12.9   ~ 358 0
12 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4240 2
13 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3682 3
14 PKS 0405-123 Sy1 04 07 48.4309594137 -12 11 36.660481492   15.09 14.86 14.7   ~ 480 1
15 NGC 1566 Sy1 04 20 00.4020009055 -54 56 16.578104141 10.29 10.19 9.73 9.21 10.1 ~ 758 2
16 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1889 2
17 QSO B0454+0356 QSO 04 56 47.1747689004 +04 00 52.945030656   16.76 16.53 16.26   ~ 234 1
18 Mrk 1095 Sy1 05 16 11.4093760763 -00 08 59.158774578   14.30 13.92     ~ 816 1
19 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 752 2
20 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 815 2
21 UGC 3374 Sy1 05 54 53.6085733702 +46 26 21.625853190   15.37 14.62     ~ 480 2
22 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 872 3
23 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 528 1
24 Mrk 376 Sy1 07 14 15.0839117013 +45 41 55.900316411   15.17 14.62     ~ 170 1
25 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1174 1
26 Mrk 9 Sy1 07 36 57.0265515253 +58 46 13.431867389   14.77 14.37     ~ 221 0
27 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 912 1
28 Mrk 79 Sy1 07 42 32.8212778143 +49 48 34.787882233   14.74 14.27     ~ 658 1
29 ICRF J074541.6+314256 Sy1 07 45 41.6716759025 +31 42 56.614085210   16.10 15.97     ~ 246 1
30 QSO B0754+10 BLL 07 57 06.64294682 +09 56 34.8523471   15.43 15.00 15.99   ~ 414 1
31 2E 1919 Sy1 08 10 58.6637281539 +76 02 42.449416413   15.03 14.71     ~ 428 0
32 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2106 1
33 QSO J0949+2955 QSO 09 49 41.1068098939 +29 55 19.260876470   16.00 16.2     ~ 142 0
34 Ton 469 Sy1 09 58 20.9495949602 +32 24 02.209578357   15.88 15.78 15.51   ~ 406 1
35 8C 0958+561 QSO 10 01 20.6915852239 +55 53 55.595776916   17.16 16.95     ~ 706 3
36 Ton 490 QSO 10 13 53.42876682 +24 49 16.4407698   16.59 16.57 15.85   ~ 178 1
37 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2469 1
38 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1446 0
39 Ton 1388 Sy1 11 19 08.6786143504 +21 19 17.986556889   14.91 14.80     ~ 428 0
40 IC 2746 Sy2 11 21 47.1180110072 +11 44 18.908935072   15.38 14.93     ~ 206 0
41 6C 113337+702604 BLL 11 36 26.4084430 +70 09 27.307497   15.16 14.49 10.51   ~ 335 1
42 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1516 0
43 ATO J176.4186-18.4541 Sy1 11 45 40.4653921674 -18 27 14.962362659   14.63 14.29 10.5   ~ 138 0
44 ICRF J114855.8-040409 Sy1 11 48 55.8848177 -04 04 09.563543   16.96 16.90 17.55   ~ 109 0
45 NGC 3998 SyG 11 57 56.1333561013 +55 27 12.925850484   11.64 12.10 10.09   ~ 592 2
46 Ton 599 QSO 11 59 31.83390975 +29 14 43.8268741   14.80 14.41 17.652 13.39 ~ 826 1
47 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2046 1
48 2E 2584 Sy1 12 04 42.1097577213 +27 54 11.867990165   15.64 15.60     ~ 360 0
49 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3475 2
50 PB 3894 Sy1 12 14 17.6737003918 +14 03 13.182526431   14.46 14.19     ~ 764 0
51 Mrk 205 Sy1 12 21 44.0723278508 +75 18 38.242986688   15.64 15.24 14.7   ~ 454 0
52 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5467 1
53 Mrk 771 Sy1 12 32 03.6224248141 +20 09 29.495841579   15.57 15.30     ~ 449 0
54 NGC 4593 Sy1 12 39 39.4435521178 -05 20 39.035028119   13.95 13.15     ~ 985 0
55 QSO J1244+1721 QSO 12 44 10.8248623367 +17 21 04.509382201   16.40 16.09     ~ 137 1
56 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2811 2
57 ICRF J130533.0-103319 Sy1 13 05 33.0149111397 -10 33 19.430590671   15.18 15.23 14.46   ~ 520 1
58 Mrk 279 Sy1 13 53 03.4356451470 +69 18 29.410672989   15.15 14.46     ~ 711 0
59 2XMM J135315.8+634546 Sy1 13 53 15.8310776491 +63 45 45.682560611   14.54 14.28     ~ 363 0
60 2MASS J14134834+4400141 Sy1 14 13 48.3307115344 +44 00 14.005465999   14.99 14.99     ~ 359 0
61 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2481 0
62 Mrk 1383 Sy1 14 29 06.5718492666 +01 17 06.155981953   15.21 14.87     ~ 422 0
63 Mrk 478 Sy1 14 42 07.4713423763 +35 26 22.939531895   14.91 14.58     ~ 502 0
64 Mrk 841 Sy1 15 04 01.1935077982 +10 26 15.778741853   14.50 14.27     ~ 599 0
65 4C 37.43 Sy1 15 14 43.0682940988 +36 50 50.355363752   17.11 17.01 15.83   ~ 382 1
66 Mrk 290 Sy1 15 35 52.4036488200 +57 54 09.516647866   15.55 15.27     ~ 469 0
67 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 451 1
68 Mrk 493 Sy1 15 59 09.6228325606 +35 01 47.568001984   15.69 15.06     ~ 276 0
69 Mrk 876 Sy1 16 13 57.1791807197 +65 43 09.953889666   16.03 15.49     ~ 529 0
70 QSO B1634+7037 QSO 16 34 28.9917493918 +70 31 32.394595988   14.90 14.66     ~ 262 0
71 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1987 2
72 2A 1705+609 Sy1 17 04 41.3742389551 +60 44 30.522600868   15.65 15.40 15.30   ~ 730 1
73 ICRF J172320.7+341757 Sy1 17 23 20.7958592865 +34 17 57.966961854   15.58 15.46     ~ 288 1
74 6C 172704+501607 BLL 17 28 18.6239898055 +50 13 10.472390025   16.55 15.97 12.95   ~ 339 1
75 QSO B1803+6737 QSO 18 03 28.8926622844 +67 38 10.560764289   16.04 15.78     ~ 97 0
76 3C 371 BLL 18 06 50.6803567107 +69 49 28.108152993   14.77 14.22 11.39   ~ 812 2
77 ClG 1821+64 ClG 18 21 56.7276 +64 20 55.841           ~ 494 1
78 2E 4066 Sy1 18 21 57.2365 +64 20 36.226   14.23 14.24     ~ 549 1
79 ICRF J183503.3+324146 Sy1 18 35 03.3896681512 +32 41 46.856048508   16.50 15.39 10.50   ~ 597 1
80 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1242 0
81 ESO 141-55 Sy1 19 21 14.1471805047 -58 40 12.981632705   14.36 13.64 13.28   ~ 331 0
82 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 530 2
83 Mrk 509 Sy1 20 44 09.7504131334 -10 43 24.724854084   13.35 13.12 10.7   ~ 1165 0
84 Mrk 1513 Sy1 21 32 27.8163185343 +10 08 19.250705656   14.92 14.64     ~ 559 0
85 2E 2135.0-1446 Sy1 21 37 45.1960175219 -14 32 55.696077090 15.41 15.63 15.53 15.0   ~ 354 0
86 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1618 1
87 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2075 1
88 NGC 7213 Sy1 22 09 16.2106632887 -47 10 00.082166299   10.97 12.08 10.50 10.6 ~ 612 0
89 Mrk 304 Sy1 22 17 12.2638362727 +14 14 20.918554073   15.02 14.66     ~ 327 0
90 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1948 3
91 Mrk 926 Sy1 23 04 43.4773393553 -08 41 08.632325890   16.20 15.91 9.4   ~ 413 0
92 4C -01.61 BLL 23 51 56.1224724223 -01 09 13.315055954   16.83 16.59     ~ 325 1

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2021.09.23-22:05:53

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