2002A&A...394...17H


Query : 2002A&A...394...17H

2002A&A...394...17H - Astronomy and Astrophysics, volume 394, 17-31 (2002/10-4)

Correlated radio and optical variations in a sample of AGN.

HANSKI M.T., TAKALO L.O. and VALTAOJA E.

Abstract (from CDS):

Radio light curves of 20 sources from the Metsaehovi monitoring program are compared with optical light curves collected from the literature. The Discrete Correlation Function analysis is applied to the data sets. A new qualitative method to study correlations is introduced, where the radio light curves are replaced by model light curves consisting of exponential outbursts. The optical flux level is compared to the phase and flux level of the model flares. Seven sources show clear correlations using the DCF analysis with six more showing a possible correlation between optical and radio events with time lags from zero to several hundred days. For twelve sources at least one simultaneous optical and radio event is seen. For eleven sources, when comparing optical flux levels with the phase of the model radio outbursts, the optical flux levels were high at the peak of the model radio outbursts. For sixteen sources, when comparing the optical flux level with the radio model flare flux level, the optical flux level was high when radio flux level was high, as well.

Abstract Copyright:

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

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 313 2
2 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 834 1
3 QSO B0235+1624 BLL 02 38 38.9300958576 +16 36 59.276150136   16.46 15.50 15.92   ~ 1450 2
4 QSO B0420-0127 QSO 04 23 15.8007747432 -01 20 33.063518580   17.50 17.00 16.28   ~ 1128 3
5 QSO B0422+004 BLL 04 24 46.8421990080 +00 36 06.329375028 16.15 15.94 16.98     ~ 338 1
6 Mrk 1506 Sy1 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 1917 2
7 3C 146 Rad 05 36 53.77 -03 08 45.2           ~ 14 1
8 QSO J0738+1742 BLL 07 38 07.3935719136 +17 42 18.998218764   16.76 16.22 15.78   ~ 924 1
9 QSO B0736+01 QSO 07 39 18.0339358560 +01 37 04.618841340   16.90 16.47 16.19   ~ 648 1
10 QSO B0754+10 BLL 07 57 06.6427726320 +09 56 34.848603888   15.43 15.00 15.99   ~ 418 1
11 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2161 1
12 Ton 599 QSO 11 59 31.8338889192 +29 14 43.826803116   14.80 14.41 17.652 13.39 ~ 850 1
13 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 812 1
14 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5559 1
15 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6649 3
16 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2863 2
17 4C 38.41 QSO 16 35 15.4928147784 +38 08 04.499799360   18.14 17.97 17.25   ~ 799 1
18 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1617 2
19 4C 09.57 BLL 17 51 32.8186120872 +09 39 00.728629416   17.46 16.78 15.57   ~ 877 1
20 3C 371 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 819 2
21 ICRF J182931.7+484446 Sy1 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 658 1
22 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2126 1
23 3C 446 BLL 22 25 47.2594205952 -04 57 01.390436856   18.83 18.39 16.3   ~ 789 1
24 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2663 2

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2022.05.25-22:36:17

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