Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Repeating flaring activity of the blazar AO 0235+164. / Escudero Pedrosa, J.; Agudo, I.; Tramacere, A.; Marscher, A. P.; Jorstad, S.; Weaver, Z. R.; Casadio, C.; Thum, C.; Myserlis, I.; Fuentes, A.; Traianou, E.; Kim, J.-Y.; Kramer, J.; López-Coto, R.; D’Ammando, F.; Bernardos, M.; Bonnoli, G.; Blinov, D. A.; Borman, G. A.; Grishina, T. S.; Hagen-Thorn, V. A.; Kopatskaya, E. N.; Larionova, E. G.; Larionov, V. M.; Larionova, L. V.; Morozova, D. A.; Savchenko, S. S.; Troitskiy, I. S.; Troitskaya, Y. V.; Vasilyev, A. A.
в: ASTRONOMY & ASTROPHYSICS, Том 682, № A100, A100, 07.02.2024.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Repeating flaring activity of the blazar AO 0235+164
AU - Escudero Pedrosa, J.
AU - Agudo, I.
AU - Tramacere, A.
AU - Marscher, A. P.
AU - Jorstad, S.
AU - Weaver, Z. R.
AU - Casadio, C.
AU - Thum, C.
AU - Myserlis, I.
AU - Fuentes, A.
AU - Traianou, E.
AU - Kim, J.-Y.
AU - Kramer, J.
AU - López-Coto, R.
AU - D’Ammando, F.
AU - Bernardos, M.
AU - Bonnoli, G.
AU - Blinov, D. A.
AU - Borman, G. A.
AU - Grishina, T. S.
AU - Hagen-Thorn, V. A.
AU - Kopatskaya, E. N.
AU - Larionova, E. G.
AU - Larionov, V. M.
AU - Larionova, L. V.
AU - Morozova, D. A.
AU - Savchenko, S. S.
AU - Troitskiy, I. S.
AU - Troitskaya, Y. V.
AU - Vasilyev, A. A.
PY - 2024/2/7
Y1 - 2024/2/7
N2 - Blazar AO 0235+164 located at a redshift of $z=0.94$, has undergone several sharp multi-spectral-range flaring episodes over recent decades. In particular, the episodes that peaked in 2008 and 2015, which were subject to extensive multi-wavelength coverage, exhibited an interesting behavior. We study the actual origin of these two observed flares by constraining the properties of the observed photo-polarimetric variability as well as of the broadband spectral energy distribution and the observed time-evolution behavior of the source. We use ultra-high-resolution total-flux and polarimetric very-long-baseline interferometry (VLBI) imaging. The analysis of VLBI images allowed us to constrain kinematic and geometrical parameters of the 7\,mm jet. We used the discrete correlation function to compute the statistical correlation and the delays between emission at different spectral ranges. The multi-epoch modeling of the spectral energy distributions allowed us to propose specific models of the emission; in particular, with the aim to model the unusual spectral features observed in this source in the X-ray region of the spectrum during strong multi spectral-range flares. We find that these X-ray spectral features can be explained by an emission component originating in a separate particle distribution than the one responsible for the two standard blazar bumps. This is in agreement with the results of our correlation analysis, where we did not find a strong correlation between the X-ray and the remaining spectral ranges. We find that both external Compton-dominated and synchrotron self-Compton-dominated models are able to explain the observed spectral energy distributions. However, the synchrotron self-Compton models are strongly favored by the delays and geometrical parameters inferred from the observations.
AB - Blazar AO 0235+164 located at a redshift of $z=0.94$, has undergone several sharp multi-spectral-range flaring episodes over recent decades. In particular, the episodes that peaked in 2008 and 2015, which were subject to extensive multi-wavelength coverage, exhibited an interesting behavior. We study the actual origin of these two observed flares by constraining the properties of the observed photo-polarimetric variability as well as of the broadband spectral energy distribution and the observed time-evolution behavior of the source. We use ultra-high-resolution total-flux and polarimetric very-long-baseline interferometry (VLBI) imaging. The analysis of VLBI images allowed us to constrain kinematic and geometrical parameters of the 7\,mm jet. We used the discrete correlation function to compute the statistical correlation and the delays between emission at different spectral ranges. The multi-epoch modeling of the spectral energy distributions allowed us to propose specific models of the emission; in particular, with the aim to model the unusual spectral features observed in this source in the X-ray region of the spectrum during strong multi spectral-range flares. We find that these X-ray spectral features can be explained by an emission component originating in a separate particle distribution than the one responsible for the two standard blazar bumps. This is in agreement with the results of our correlation analysis, where we did not find a strong correlation between the X-ray and the remaining spectral ranges. We find that both external Compton-dominated and synchrotron self-Compton-dominated models are able to explain the observed spectral energy distributions. However, the synchrotron self-Compton models are strongly favored by the delays and geometrical parameters inferred from the observations.
UR - https://www.mendeley.com/catalogue/15f94204-8f9f-332a-a96c-e743621b4bc9/
U2 - 10.1051/0004-6361/202346885
DO - 10.1051/0004-6361/202346885
M3 - Article
VL - 682
JO - ASTRONOMY & ASTROPHYSICS
JF - ASTRONOMY & ASTROPHYSICS
SN - 0004-6361
IS - A100
M1 - A100
ER -
ID: 116937507