1999A&A...342..687P


Query : 1999A&A...342..687P

1999A&A...342..687P - Astronomy and Astrophysics, volume 342, 687-703 (1999/2-3)

Search for optical microvariability in a large sample of Seyfert I galaxies.

PETRUCCI P.O., CHELLI A., HENRI G., CRUZ-GONZALEZ I., SALAS L. and MUJICA R.

Abstract (from CDS):

We present results of an optical (I band) monitoring of a sample of 22 Seyfert I galaxies. We aimed to detect microvariability with time resolution from ≃ 6 minutes down to 30 seconds for the most luminous one. It is the largest survey ever done in the search of rapid optical variations in Seyfert galaxies. We used differential photometry and a new method of analysis between galaxy and comparison stars light curves in order to minimize the influence of the intrinsic variabilities of the latter. We thus obtain precision on standard deviation measurements less than 1% and generally of the order of 0.5%. We obtain no clear detection of microvariability in any of these objects. In the hypothesis where optical microvariability could be due to synchrotron emission of a non thermal electrons population, we discuss the physical constraints imposed by these results.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - radiation mechanisms: non-thermal - galaxies: active - galaxies: Seyfert - infrared: galaxies

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 NGC 7811 Sy1 00 02 26.4202485648 +03 21 06.941198088   15.33 14.68     ~ 82 0
2 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1171 0
3 Mrk 359 Sy1 01 27 32.5217343720 +19 10 43.839069600   14.89 14.22     ~ 289 0
4 NGC 863 Sy1 02 14 33.5604714720 -00 46 00.181845336   14.48 13.81 17.9   ~ 631 0
5 Mrk 1044 Sy1 02 30 05.5225590096 -08 59 53.207139372   14.74 14.29 13.981 13.585 ~ 248 0
6 NGC 1019 Sy1 02 38 27.4157281584 +01 54 27.757234728   15.71 14.95     ~ 72 0
7 IC 1854 Sy1 02 49 20.6915840376 +19 18 14.440530996   15.86 14.81     ~ 114 0
8 2MASX J04472072-0508138 Sy1 04 47 20.7258812832 -05 08 14.101533960   15.97 15.11 12.6   ~ 32 0
9 4U 0509+01 Sy1 05 12 40.35 +03 11 44.1   15.45 14.80     ~ 12 0
10 Mrk 1095 Sy1 05 16 11.4092471904 -00 08 59.157166920   14.30 13.92     ~ 834 1
11 UGC 3374 Sy1 05 54 53.6080860768 +46 26 21.624853488   15.37 14.62     ~ 490 2
12 Mrk 376 Sy1 07 14 15.0840050688 +45 41 55.900253292   15.17 14.62     ~ 175 1
13 Mrk 9 Sy1 07 36 57.0265753824 +58 46 13.432215792   14.77 14.37     ~ 226 0
14 Ton 951 Sy1 08 47 42.4485615096 +34 45 04.482515304   14.83 14.50     ~ 443 0
15 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1472 0
16 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3520 2
17 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2531 0
18 Mrk 1383 Sy1 14 29 06.5720038632 +01 17 06.155007252   15.21 14.87     ~ 429 0
19 Mrk 684 Sy1 14 31 04.7823008520 +28 17 14.127735336   15.36 14.68     ~ 96 0
20 Mrk 478 Sy1 14 42 07.4714418744 +35 26 22.938625500   14.91 14.58     ~ 511 0
21 Mrk 1392 Sy1 15 05 56.5521472536 +03 42 26.339214780   15.80 15.50     ~ 110 0
22 Mrk 1098 Sy1 15 29 40.5830776920 +30 29 09.328569684   15.84 14.86     ~ 55 0
23 LEDA 97534 Sy2 15 45 59.0969894160 +27 06 29.518422912     16.3     ~ 22 0
24 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1989 3

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2022.05.25-05:13:01

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