E-resources
Peer reviewed
Open access
-
Raiteri, C M; Villata, M; Carnerero, M I; Savchenko, S S; Kurtanidze, S O; Vlasyuk, V V; Marchini, A; Matsumoto, K; Lorey, C; Joner, M D; Gazeas, K; Carosati, D; Mirzaqulov, D O; Acosta Pulido, J A; Agudo, I; Bachev, R; Benítez, E; Borman, G A; Calcidese, P; Chen, W P; Damljanovic, G; Ehgamberdiev, S A; Elsässer, D; Feige, M; Frasca, A; Gaur, H; Grishina, T S; Gupta, A C; Hiriart, D; Holland, M; Horst, B; Ibryamov, S; Ivanidze, R Z; Jensen, J; Jithesh, V; Jovanovic, M D; Kiehlmann, S; Kimeridze, G N; Kishore, S; Kopatskaya, E N; Kurtanidze, O M; Larionova, E G; Lin, H C; Mannheim, K; Marinelli, C; Moreira Reyes, J; Morozova, D A; Nikolashvili, M G; Reinhart, D; Romanov, F D; Semkov, E; Seufert, J; Shishkina, E V; Sigua, L A; Skalidis, R; Spiridonova, O I; Stojanovic, M; Strigachev, A; Troitskaya, Y V; Troitskiy, I S; Tsai, A; Vasilyev, A A; Vince, O; Vrontaki, K; Wani, K; Watts, D; Zhovtan, A V
Monthly Notices of the Royal Astronomical Society, 10/2023, Volume: 526, Issue: 3Journal Article
ABSTRACT In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in the optical and γ-ray bands. We present optical photometric and polarimetric data acquired by the Whole Earth Blazar Telescope (WEBT) Collaboration from 2022 April 6 to July 6. Many episodes of unprecedented fast variability were detected, implying an upper limit to the size of the emitting region as low as $10^{-4}$ parsec. The WEBT data show rapid variability in both the degree and angle of polarization. We analyse different models to explain the polarization behaviour in the framework of a twisting jet model, which assumes that the long-term trend of the flux is produced by variations in the emitting region viewing angle. All the models can reproduce the average trend of the polarization degree, and can account for its general anticorrelation with the flux, but the dispersion of the data requires the presence of intrinsic mechanisms, such as turbulence, shocks, or magnetic reconnection. The WEBT optical data are compared to γ-ray data from the Fermi satellite. These are analysed with both fixed and adaptive binning procedures. We show that the strong correlation between optical and γ-ray data without measurable delay assumes different slopes in faint and high brightness states, and this is compatible with a scenario where in faint states we mainly see the imprint of the geometrical effects, while in bright states the synchrotron self-Compton process dominates.
Author
Shelf entry
Permalink
- URL:
Impact factor
Access to the JCR database is permitted only to users from Slovenia. Your current IP address is not on the list of IP addresses with access permission, and authentication with the relevant AAI accout is required.
Year | Impact factor | Edition | Category | Classification | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Select the library membership card:
If the library membership card is not in the list,
add a new one.
DRS, in which the journal is indexed
Database name | Field | Year |
---|
Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
---|
Source: Personal bibliographies
and: SICRIS
The material is available in full text. If you wish to order the material anyway, click the Continue button.