The Repeating Flaring Activity of Blazar AO 0235+164
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| Format: | Preprint |
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2023
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| author | Pedrosa, Juan Escudero Agudo, Iván Tramacere, Andrea Marscher, Alan P. Jorstad, Svetlana Weaver, Z. R. Casadio, Carolina Thum, Clemens Myserlis, Ioannis Fuentes, Antonio Traianou, Efthalia Kim, Jae-Young Kramer, Joana López-Coto, Rubén D'Ammando, Filippo Bernardos, M. Bonnoli, Giacomo Blinov, Dmitriy 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. |
| author_facet | Pedrosa, Juan Escudero Agudo, Iván Tramacere, Andrea Marscher, Alan P. Jorstad, Svetlana Weaver, Z. R. Casadio, Carolina Thum, Clemens Myserlis, Ioannis Fuentes, Antonio Traianou, Efthalia Kim, Jae-Young Kramer, Joana López-Coto, Rubén D'Ammando, Filippo Bernardos, M. Bonnoli, Giacomo Blinov, Dmitriy 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. |
| contents | Context. Blazar AO 0235+164, located at redshift z = 0.94, has undergone several sharp multi-spectral-range flaring episodes during the last decades. In particular, the episodes peaking in 2008 and 2015, that received extensive multi-wavelength coverage, exhibited interesting behavior.
Aims. We study the actual origin of these two observed flares by constraining the properties of the observed photo-polarimetric variability, those of the broad-band spectral energy-distribution and the observed time-evolution behavior of the source as seen by ultra-high resolution total-flux and polarimetric Very-long-baseline interferometry (VLBI) imaging.
Methods. The analysis of VLBI images allows us to constrain kinematic and geometrical parameters of the 7 mm jet. We use the Discrete Correlation Function to compute the statistical correlation and the delays between emission at different spectral ranges. Multi-epoch modeling of the spectral energy distributions allows us to propose specific models of emission; in particular for the unusual spectral features observed in this source in the X-ray region of the spectrum during strong multi spectral-range flares.
Results. 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 that do not find a strong correlation between the X-rays and the remaining spectral ranges. We find that both external Compton dominated and synchrotron self-Compton dominated models can explain the observed spectral energy distributions. However, synchrotron self-Compton models are strongly favored by the delays and geometrical parameters inferred from the observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_01157 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The Repeating Flaring Activity of Blazar AO 0235+164 Pedrosa, Juan Escudero Agudo, Iván Tramacere, Andrea Marscher, Alan P. Jorstad, Svetlana Weaver, Z. R. Casadio, Carolina Thum, Clemens Myserlis, Ioannis Fuentes, Antonio Traianou, Efthalia Kim, Jae-Young Kramer, Joana López-Coto, Rubén D'Ammando, Filippo Bernardos, M. Bonnoli, Giacomo Blinov, Dmitriy 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. High Energy Astrophysical Phenomena Context. Blazar AO 0235+164, located at redshift z = 0.94, has undergone several sharp multi-spectral-range flaring episodes during the last decades. In particular, the episodes peaking in 2008 and 2015, that received extensive multi-wavelength coverage, exhibited interesting behavior. Aims. We study the actual origin of these two observed flares by constraining the properties of the observed photo-polarimetric variability, those of the broad-band spectral energy-distribution and the observed time-evolution behavior of the source as seen by ultra-high resolution total-flux and polarimetric Very-long-baseline interferometry (VLBI) imaging. Methods. The analysis of VLBI images allows us to constrain kinematic and geometrical parameters of the 7 mm jet. We use the Discrete Correlation Function to compute the statistical correlation and the delays between emission at different spectral ranges. Multi-epoch modeling of the spectral energy distributions allows us to propose specific models of emission; in particular for the unusual spectral features observed in this source in the X-ray region of the spectrum during strong multi spectral-range flares. Results. 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 that do not find a strong correlation between the X-rays and the remaining spectral ranges. We find that both external Compton dominated and synchrotron self-Compton dominated models can explain the observed spectral energy distributions. However, synchrotron self-Compton models are strongly favored by the delays and geometrical parameters inferred from the observations. |
| title | The Repeating Flaring Activity of Blazar AO 0235+164 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.01157 |