2009A&A...493..907B


Query : 2009A&A...493..907B

2009A&A...493..907B - Astronomy and Astrophysics, volume 493, 907-911 (2009/1-3)

Quasar optical variability: searching for interband time delays.

BACHEV R.S.

Abstract (from CDS):

The main purpose of this paper is to study time delays between the light variations in different wavebands for a sample of quasars. Measuring a reliable time delay for a large number of quasars may help constraint the models of their central engines. The standard accretion disk irradiation model predicts a delay of the longer wavelengths behind the shorter ones, a delay that depends on the fundamental quasar parameters. Since the black hole masses and the accretion rates are approximately known for the sample we use, one can compare the observed time delays with the expected ones. We applied the interpolation cross-correlation function (ICCF) method to the Giveon et al. sample of 42 quasars, monitored in two (B and R) colors, to find the time lags represented by the ICCF peaks. Different tests were performed to assess the influence of photometric errors, sampling, etc., on the final result. We found that most of the objects show a delay in the red light curve behind the blue one (a positive lag), which on average for the sample is about +4 days (+3 for the median), although the scatter is significant. These results are broadly consistent with the reprocessing model, especially for the well-sampled objects. The normalized time-lag deviations do not seem to correlate significantly with other quasar properties, including optical, radio, or X-ray measurables. On the other hand, many objects show a clear negative lag, which, if real, may have important consequences for the variability models.

Abstract Copyright:

Journal keyword(s): galaxies: quasars: general - accretion, accretion disks

Simbad objects: 42

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Number of rows : 42
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 LEDA 1790 Sy1 00 29 13.7012449608 +13 16 03.947778264   15.70 15.41     ~ 420 0
2 LEDA 3237 Sy1 00 54 52.1183662680 +25 25 38.983241532     15.42     ~ 360 0
3 2MASS J08105865+7602424 Sy1 08 10 58.6641543864 +76 02 42.450451260   15.03 14.71     ~ 443 0
4 MCG+13-07-002 Sy1 08 44 45.2999013720 +76 53 09.465739008     15.7     ~ 180 0
5 Ton 951 Sy1 08 47 42.4485615096 +34 45 04.482515304   14.83 14.50     ~ 447 0
6 Ton 1057 Sy1 09 25 54.7145627448 +19 54 05.064888348   16.02 15.89     ~ 165 0
7 PG 0953+414 Sy1 09 56 52.3931554992 +41 15 22.211247636 14.710 15.611 15.546 15.294 14.720 ~ 436 0
8 LEDA 29208 Sy1 10 04 20.1379926888 +05 13 00.400882728   16.73 16.55     ~ 233 1
9 2MASS J10145491+0033374 Sy1 10 14 54.9035635608 +00 33 37.366161048   20.23 18.94 16.104   ~ 154 0
10 QSO B1048+342 Sy1 10 51 43.8916339296 +33 59 26.683392840   17.11 16.79     ~ 179 0
11 2E 2389 Sy1 11 04 13.8611496720 +76 58 58.194549084   15.70 15.72 15.40   ~ 522 1
12 LEDA 34449 Sy1 11 17 06.3989076960 +44 13 33.324039480   16.32 16.12     ~ 229 0
13 LEDA 34570 Sy1 11 18 30.2894794680 +40 25 54.068810952   16.34 16.21     ~ 212 0
14 2MASS J11243917+4201450 Sy1 11 24 39.1797883104 +42 01 45.014547252   16.45 16.28     ~ 147 0
15 ATO J178.4553+11.4751 Sy1 11 53 49.2707664888 +11 28 30.403025688   16.87 16.71     ~ 119 0
16 LEDA 38224 Sy1 12 04 42.1097215992 +27 54 11.869350264   15.64 15.60     ~ 371 0
17 PB 3894 Sy1 12 14 17.6738687784 +14 03 13.182723144   14.46 14.19     ~ 784 0
18 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5600 1
19 Mrk 771 Sy1 12 32 03.6223710000 +20 09 29.495834136   15.57 15.30     ~ 467 0
20 LEDA 45656 Sy1 13 09 47.0031619008 +08 19 48.212362524   16.04 15.89     ~ 369 0
21 Ton 1565 Sy1 13 12 17.7526981968 +35 15 21.086467128   15.45 15.64 14.2   ~ 258 1
22 2MASS J13234951+6541480 Sy1 13 23 49.5182430360 +65 41 48.164463600   16.01 15.84     ~ 162 0
23 2XMM J135315.8+634546 Sy1 13 53 15.8311116864 +63 45 45.683126676   14.54 14.28     ~ 367 0
24 2MASS J13563279+2103523 Sy1 13 56 32.7981405816 +21 03 52.378155576   15.85 17.07     ~ 94 0
25 Ton 182 Sy1 14 05 16.2178674936 +25 55 34.117540788   15.42 15.34     ~ 239 0
26 LEDA 50313 Sy1 14 06 21.8900886888 +22 23 46.515550056   16.62 16.42     ~ 220 0
27 LEDA 50824 Sy1 14 13 48.3306274368 +44 00 14.003371296   14.99 14.99     ~ 367 0
28 LEDA 51016 Sy1 14 17 00.8224797456 +44 56 06.336360024   16.93 16.63     ~ 240 0
29 LEDA 51142 Sy1 14 19 03.8170514760 -13 10 44.785212600   16.46 16.10 16.50   ~ 226 0
30 2MASS J14294306+4747262 Sy1 14 29 43.0739786592 +47 47 26.217623904   17.29 16.97     ~ 168 0
31 2MASS J14464593+4035057 Sy1 14 46 45.9392259288 +40 35 05.797233636   16.28 16.11     ~ 280 0
32 4C 37.43 Sy1 15 14 43.0683049560 +36 50 50.355436776   17.11 17.01 15.83   ~ 389 1
33 LEDA 54782 Sy1 15 21 14.2570766112 +22 27 43.827693336   16.09 16.09     ~ 124 0
34 2MASX J15474353+2052167 Sy1 15 47 43.5376371336 +20 52 16.612810320   16.80 16.69 15.70   ~ 471 0
35 Mrk 876 Sy1 16 13 57.1795021224 +65 43 09.952685328   16.03 15.49     ~ 545 0
36 Mrk 877 Sy1 16 20 11.2799789400 +17 24 27.515242152   15.79 15.39     ~ 260 0
37 QSO B1626+5529 Sy1 16 27 56.1123628752 +55 22 31.559061504   15.79 15.68     ~ 201 0
38 IRAS 17002+5153 Sy1 17 01 24.8265469104 +51 49 20.447878836   15.49 15.12     ~ 368 0
39 3C 351.0 Sy1 17 04 41.3742408840 +60 44 30.520617000   15.65 15.40 15.30   ~ 737 1
40 Mrk 1513 Sy1 21 32 27.8162556672 +10 08 19.252365396   14.92 14.64     ~ 575 0
41 2MASS J22360767+1343554 Sy1 22 36 07.6824548136 +13 43 55.360914636   16.48 16.34     ~ 150 0
42 4C 11.72 BLL 22 54 10.4214226080 +11 36 38.748083760   16.02 15.82     ~ 328 1

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2022.10.02-03:17:12

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