Multiwavelength Variability of BL Lacertae Measured with High Time Resolution
Autor: | Katsura Matsumoto, Ivan S. Troitsky, G. V. Baida, Evgeni Ovcharov, Yu. V. Troitskaya, Svetlana G. Jorstad, An-Li Tsai, Sh. A. Ehgamberdiev, M. I. Carnerero, Alan P. Marscher, V. Dhiman, S. O. Kurtanidze, D. A. Morozova, Karen E. Williamson, A. V. Zhovtan, Krista Lynne Smith, O. Vince, M. Villata, A. A. Nikiforova, M. Minev, J. J. Slater, H. Y. Hsiao, A. A. Vasilyev, A. Strigachev, Wen Ping Chen, C. M. Raiteri, Goran Damljanović, J. A. Acosta-Pulido, Antoniya Valcheva, Sunay Ibryamov, Evgeni Semkov, D. O. Mirzaqulov, Erika Benítez, Rumen Bachev, Elena G. Larionova, Thomas J. Balonek, David Hiriart, Alok C. Gupta, E. Zaharieva, Givi N. Kimeridze, Z. R. Weaver, D. J. Dougherty, M. G. Nikolashvili, Ryota Matsumura, Valeri M. Larionov, D. Carosati, T. S. Grishina, A. C. Sadun, Sergey S. Savchenko, V. Bozhilov, M. Stojanovic, O. M. Kurtanidze, N. Rizzi, M. Hart, G. A. Borman, Michael D. Joner, E. N. Kopatskaya |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Physics
Active galactic nucleus Swift Gamma-Ray Burst Mission 010504 meteorology & atmospheric sciences Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Astrophysics Light curve Polarization (waves) 01 natural sciences Exoplanet law.invention Telescope Space and Planetary Science law 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics Blazar 010303 astronomy & astrophysics 0105 earth and related environmental sciences Fermi Gamma-ray Space Telescope |
Popis: | In an effort to locate the sites of emission at different frequencies and physical processes causing variability in blazar jets, we have obtained high time-resolution observations of BL Lacertae over a wide wavelength range: with the Transiting Exoplanet Survey Satellite (TESS) at 6000–10000 Å with 2 minute cadence; with the Neil Gehrels Swift satellite at optical, UV, and X-ray bands; with the Nuclear Spectroscopic Telescope Array at hard X-ray bands; with the Fermi Large Area Telescope at γ-ray energies; and with the Whole Earth Blazar Telescope for measurement of the optical flux density and polarization. All light curves are correlated, with similar structure on timescales from hours to days. The shortest timescale of variability at optical frequencies observed with TESS is ∼0.5 hr. The most common timescale is 13 ± 1 hr, comparable with the minimum timescale of X-ray variability, 14.5 hr. The multiwavelength variability properties cannot be explained by a change solely in the Doppler factor of the emitting plasma. The polarization behavior implies that there are both ordered and turbulent components to the magnetic field in the jet. Correlation analysis indicates that the X-ray variations lag behind the γ-ray and optical light curves by up to ∼0.4 day. The timescales of variability, cross-frequency lags, and polarization properties can be explained by turbulent plasma that is energized by a shock in the jet and subsequently loses energy to synchrotron and inverse Compton radiation in a magnetic field of strength ∼3 G. |
Databáze: | OpenAIRE |
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