2008A&A...485...51H

Query : 2008A&A...485...51H

2008A&A...485...51H - Astronomy and Astrophysics, volume 485, 51-61 (2008/7-1)

Long-term radio variability of AGN: flare characteristics.

HOVATTA T., NIEPPOLA E., TORNIKOSKI M., VALTAOJA E., ALLER M.F. and ALLER H.D.

Abstract (from CDS):

We have studied the flare characteristics of 55 AGN at 8 different frequency bands between 4.8 and 230GHz. Our extensive database enables us to study the various observational properties of flares in these sources and compare our results with theoretical models. We visually extracted 159 individual flares from the flux density curves and calculated different parameters, such as the peak flux density and duration, in all the frequency bands. The selection of flares is based on the 22 and 37GHz data from Metsaehovi Radio Observatory and 90 and 230GHz data from the SEST telescope. Additional lower frequency 4.8, 8, and 14.5GHz data are from the University of Michigan Radio Observatory. We also calculated variability indices and compared them with earlier studies. The observations seem to adhere well to the shock model, but there is still large scatter in the data. Especially the time delays between different frequency bands are difficult to study due to the incomplete sampling of the higher frequencies. The average duration of the flares is 2.5 years at 22 and 37GHz, which shows that long-term monitoring is essential for understanding the typical behaviour in these sources. It also seems that the energy release in a flare is independent of the duration of the flare.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - radio continuum: galaxies

Simbad objects: 55

goto Full paper

goto View the references in ADS

Number of rows : 55
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 Mrk 1501 Sy1 00 10 31.00590413 +10 58 29.5042981   15.96 15.40 12.22   ~ 718 0
2 7C 0059+5808 QSO 01 02 45.76237340 +58 24 11.1366164   20.09 19.22 18.57 17.90 ~ 231 1
3 4C 01.02 Bla 01 08 38.77110544 +01 35 00.3171844   18.54 18.39 19.05   ~ 545 1
4 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 344 2
5 QSO B0208-512 BLL 02 10 46.2004407600 -51 01 01.893013392   17.10 16.93 14.82   ~ 449 1
6 4C 67.05 QSO 02 28 50.05148365 +67 21 03.0293322   19.5 19.50 18.1   ~ 249 1
7 4C 28.07 QSO 02 37 52.40567519 +28 48 08.9899986     19.30 16.99   ~ 615 1
8 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1551 2
9 6C 033321+320838 Bla 03 36 30.10760267 +32 18 29.3422162     17.50 16.6   ~ 656 1
10 QSO B0336-0156 QSO 03 39 30.93778633 -01 46 35.8041892   18.96 18.41 17.33   ~ 558 1
11 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 952 1
12 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1209 3
13 QSO B0422+004 BLL 04 24 46.8421990080 +00 36 06.329375028 16.15 15.94 16.98     ~ 359 1
14 Mrk 1506 Sy1 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 2001 2
15 QSO B0446+113 BLL 04 49 07.67110194 +11 21 28.5963618     20.00 18.58   ~ 275 1
16 QSO J0530+13 Bla 05 30 56.41674741 +13 31 55.1494688     20.00 19.35   ~ 961 1
17 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 885 2
18 QSO B0607-157 QSO 06 09 40.94954062 -15 42 40.6727537   18.47 18.00 19.90   ~ 315 1
19 7C 064253.00+445430.00 QSO 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 348 1
20 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1303 1
21 QSO J0738+1742 BLL 07 38 07.39375312 +17 42 18.9981506   16.76 16.22 15.78   ~ 994 1
22 QSO B0736+01 QSO 07 39 18.03389906 +01 37 04.6177501   16.90 16.47 16.19   ~ 688 1
23 QSO B0754+10 BLL 07 57 06.64295154 +09 56 34.8522544   15.43 15.00 15.99   ~ 440 1
24 7C 080458.39+495918.00 QSO 08 08 39.66628970 +49 50 36.5304041   19.55 19.18 18.34   ~ 363 2
25 ICRF J083052.0+241059 Sy1 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 530 1
26 [VV98] J085009.6-121334 QSO 08 50 09.63563375 -12 13 35.3761390     16.80 16.02   ~ 140 0
27 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2338 1
28 ICRF J105829.6+013358 Sy1 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 778 2
29 Ton 599 Sy1 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 926 1
30 ICRF J122454.4+212246 Sy1 12 24 54.4583146056 +21 22 46.385507388   17.56 17.50 18.2   ~ 705 2
31 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5807 1
32 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3049 2
33 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 855 1
34 QSO B1334-127 Bla 13 37 39.78278132 -12 57 24.6933925   18.5 19.00 16.22   ~ 505 1
35 ICRF J141558.8+132023 Sy2 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 440 1
36 QSO B1502+1041 Bla 15 04 24.97978391 +10 29 39.1985309   18.97 18.56 18.94   ~ 578 1
37 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1319 1
38 4C 10.45 QSO 16 08 46.20318700 +10 29 07.7757424   18.5 18.70 18.03   ~ 384 1
39 6C 161147+342017 QSO 16 13 41.06424322 +34 12 47.9088535   17.98 17.46 17.07   ~ 644 1
40 4C 38.41 QSO 16 35 15.49297809 +38 08 04.5005995   18.14 17.97 17.25   ~ 859 1
41 NAME Her B Sy1 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1727 2
42 QSO B1730-130 QSO 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1140 1
43 4C 51.37 Bla 17 40 36.97784792 +52 11 43.4073694   18.16 18.70 16.73   ~ 415 1
44 QSO B1741-038 QSO 17 43 58.85613537 -03 50 04.6167326     20.40 17.98   ~ 549 1
45 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 947 1
46 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 871 0
47 8C 2007+777 BLL 20 05 30.9987913056 +77 52 43.248139536     16.5 17.36   ~ 447 1
48 4C 06.69 Bla 21 48 05.45866779 +06 57 38.6041877   16.85 16.47 15.06   ~ 676 1
49 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2262 1
50 4C 31.63 BLL 22 03 14.9756830008 +31 45 38.269473228   15.85 15.58 14.33   ~ 497 1
51 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 831 1
52 QSO B2227-0848 Bla 22 29 40.08433313 -08 32 54.4355294   17.80 17.41 17.81   ~ 361 1
53 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1122 2
54 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2852 2
55 ICRF J225805.9-275821 Sy1 22 58 05.96287687 -27 58 21.2567572   17.34 16.77 17.20   ~ 366 1

To bookmark this query, right click on this link: simbad:objects in 2008A&A...485...51H and select 'bookmark this link' or equivalent in the popup menu