Investigation of the Flaring Activity of BL Lac in July–November 2021

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Abstract

The source BL Lac exhibited an enhanced activity from August 2020 to July 2022. This activity peaked in July–August 2021. In this period the source reached historic brightness maxima in various energy ranges. Observations of this nonstandard maximum were carried out by the SAI staff of the Crimean Station of SAI and with the telescopes of the Caucasus Mountain Observatory (CMO SAI MSU). Optical and near-infrared photometric data as well as optical polarimetric data were obtained. When investigating the correlation between the optical and gamma-ray fluxes and between the optical and infrared fluxes, its high degree with an almost zero lag was confirmed—this means that the emission regions spatially coincide or are very close together. The degree of linear polarization in the investigated period changed in a wide range, reaching 20 %, with an anticorrelation between the degree of linear polarization and the brightness of the object having been observed. A similar pattern of variation was also observed in the preceding flares of this object. The changes in the electric vector position angle (EVPA) show a dependence on the rate of change of the object’s brightness. The EVPA changed greatly during flares and slowly at the times of a slow change in the intensity.

About the authors

L. S. Ugol’kova

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Email: lsu1@mail.ru
119234, Moscow, Russia

M. S. Pshirkov

Sternberg Astronomical Institute (SAI MSU), Moscow State University; Pushchino Radio Astronomy Observatory, Astrospace Center, Lebedev Institute of Physics, Russian Academy of Sciences

Email: lsu1@mail.ru
119234, Moscow, Russia; 142290, Pushchino, Moscow oblast, Russia

V. Goranskij

Sternberg Astronomical Institute (SAI MSU), Moscow State University; Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz

Email: lsu1@mail.ru
119234, Moscow, Russia; Nizhnij Arkhyz, Russia

N. P. Ikonnikova

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Email: lsu1@mail.ru
119234, Moscow, Russia

B. S. Safonov

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Email: lsu1@mail.ru
119234, Moscow, Russia

A. M. Tatarnikov

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Email: lsu1@mail.ru
119234, Moscow, Russia

E. V. Shimanovskaya

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Email: lsu1@mail.ru
119234, Moscow, Russia

M. A. Burlak

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Email: lsu1@mail.ru
119234, Moscow, Russia

M. D. Afonina

Sternberg Astronomical Institute (SAI MSU), Moscow State University

Author for correspondence.
Email: lsu1@mail.ru
119234, Moscow, Russia

References

  1. Абдо и др. (А.A. Abdo, M. Ackermann, I. Agudo, M. Ajello, H.D. Aller, M. Aller, E. Angelakis, A. Arkharov, et al.), Astrophys. J. 716, 30 (2010).
  2. Абдоллахи и др. (S. Abdollahi, F. Acero M. Ackermann M. Ajello, W.B. Atwood, M. Axelsson, L. Baldini, J. Ballet, et al.), Astrophys. J. Suppl. Ser. 247, 33 (2020).
  3. Агиляр-Руиз и др. (E. Aguilar-Ruiz, N. Fraija1, A. Galvan-Gamez1, and E. Benitez), MNRAS 512, 1557A (2022).
  4. Ангелакис и др. (E. Angelakis, T. Hovatta, D. Blinov, V. Pavlidou, S. Kiehlmann, I. Myserlis, M. Bottcher, P. Mao, et al.), MNRAS 463, 3365 (2016).
  5. Атвуд и др. (WB. Atwood, A.A. Abdo, M. Ackermann, W. Althouse, B. Anderson, M. Axelsson, L. Baldini, J. Ballet, et al.), Astrophys. J. 697, 1071 (2009).
  6. Бердников Л.Н., Белинский А.А., Шатский Н.И. и др., Астрон. журн. 97, 284 (2020).
  7. Блинов, Гаген-Торн (D.A. Blinov and V.A. Hagen-Thorn), Astron. Astrophys. 503, 103 (2009).
  8. Блинов, Павлиду (D. Blinov and V. Pavlidou), Galaxies 7, 46 (2019).
  9. Блинов и др. (D. Blinov, V. Pavlidou, I. Papadakis, S. Kiehlmann, I. Liodakis, G.V. Panopoulou, T.J. Pearson, E. Angelakis, et al.), MNRAS 462, 1775 (2016).
  10. Блинов и др. (D. Blinov, G. Jorstad, V.M. Larionov, N.R. MacDonald, T. Grishina, E. Kopatskaya, E. Larionova, L. Larionova, et al.), MNRAS 505, 4616 (2021).
  11. Блэндфорд, Знаек (R.D. Blandford and R.L. Znajek,), MNRAS 179, 433 (1977).
  12. Блэндфорд, Пэйн (R.D. Blandford and D.G. Payne), MNRAS 199, 883 (1982).
  13. Блэндфорд, Рис (R.D. Blandford and M.J. Rees,), in A.M. Wolfe (ed.), BL Laс Objeсts, p. 328 (1978).
  14. Ботчер (M. Bottcher), Astrophys. Space Sci. 309, 95 (2007).
  15. Брегман (J.N. Bregman, M.J. Lebofsky, and M. Aller), Nature 293, 714 (1981).
  16. Вейве и др. (Z.R Weaver, K.E. Williamson, S.G. Jorstad, A.P. Marscher, V.M. Larionov, C.M. Raiteri, M. Villata, J.A. Acosta-Pulido, et al.), Astrophys. J. 900, 137W (2020).
  17. Гаген-Торн и др. (V.A. Hagen-Thorn, V.M. Larionov, S.G. Jorstad, and E.G. Larionova), Astron. J. 124, 3031 (2002a).
  18. Гаген-Торн и др. (V.A. Hagen-Thorn, E.G. Larionova, S.G. Jorstad, C.-I. Bjornsson, and V.M. Larionov), Astron. Astrophys. 385, 55 (2002б).
  19. Гаскел и др. (C.M. Gaskell and L.S. Sparke), Astrophys. J. Suppl. Ser. 305, 175 (1986).
  20. Гаскел и др. (C.M. Gaskell, B.M. Peterson, and M. Bradley), Astrophys. J. Suppl. Ser. 65, 1 (1987).
  21. Джорстед и др. (S.G. Jorstad, A.P. Marscher, D.A. Morozova, I.S. Troitsky, I. Agudo, C. Casadio, A. Foord, J.L. Gomes, et al.), Astrophys. J. 846, 98 (2017).
  22. Джорстед и др. (S.G. Jorstad, A.P. Marsher, C.M. Raiteri, M. Villata, Z.R. Weaver, H. Zhang, et al.), Nature 609, 265 (2022).
  23. Донг и др. (L. Dong, H. Zhang, and D. Giannios), MNRAS 494, 1817 (2020).
  24. Зенсус и др. (J.A. Zensus, G.B. Taylor, and J.M. Wrobel) Astronomical Society of the Pacific Conference Series, vol. 144, p. 25 (1998).
  25. Имазава и др. (R. Imazawa, M. Sasada, N. Hazama, Y. Fukazawa, K.S. Kawabata, T. Nakaoka, et al.), Publ. Astron. Soс. Japan 75(1), 1 (2023).
  26. Кельман и др. (S. Kiehlmann, D. Blinov, I. Liodakis, V. Pavlidou, A.C.S. Readhead, E. Angelakis, C. Casadio, T. Hovatta, et al.), MNRAS 507, 225 (2021).
  27. Кельман и др. (S. Kiehlmann, D. Blinov, T.J. Pearson, and I. Liodakis), MNRAS 472, 3589 (2017).
  28. Кларк (D. Clarke), Stellar Polarimetry, Wiley-VCH (2010).
  29. Ковалев и др. (Y.Y. Kovalev, N.S. Kardashev, K.V. Sokolovsky, P.A. Voitsik, T. An, J.M. Anderson, A.S. Andrianov, V.Yu. Avdeev, et al.), Adv. Spaсe Res. 65, 705 (2020a).
  30. Ковалев и др. (Y.Y. Kovalev, A.B. Pushkarev, E.E. Nokhrina, A.V. Plavin, V.S. Beskin, A.V. Chernoglazov, M.V. Lister, and T. Savolainen), MNRAS 495, 3576 (2020б).
  31. Ковачевич и др. (A. Kovaсeviс, L.C. Popoviс, A.I. Shapovalova, D. IIic, A.N. Burenkov, and V.H. Chavushyan), Adv. Spaсe Res. 54, 1414 (2014).
  32. Коэн, Саволайнен (M.H. Cohen and T. Savolainen), Astron. Astrophys. 636, A79 (2020).
  33. Леггет и др. (S.K. Leggett, M.J. Currie, W.P. Varicatt, T.G. Hawarden, A.J. Adamson, J. Buckle, T. Carroll, J.K. Davies, et al.), MNRAS 373, 781 (2006).
  34. Лиодакис и др. (I. Liodakis, D. Blinov, S.G. Jorstad, A.A. Arkharov, A. Di Paola, N.V. Efimova, T.S. Grishina, S. Kiehlmann, et al.), Astrophys. J. 902, 61 (2020).
  35. Лобанов (A.P. Lobanov), Astron. Astrophys. 330, 79 (1998).
  36. МакХарди и др. (I.M. McHardy, D.T. Cameron, T. Dwelly, S. Connolly, P. Lira, D. Emmanoulopoulos, J. Gelbord, E. Breedt, P. Arevalo, and P. Uttley), MNRAS 444, 1469 (2014).
  37. Маршер и др. (A.P. Marscher, S.G. Jorstad, F.D. D’Arcangelo, P.S. Smith, G.G. Willams, V.M. Larionov, H. Oh, A.R. Olmstead, et al.), Nature 452, 966 (2008).
  38. Маршер, Джорстед (A.P. Marscher and S.G. Jorstad), Galaxies 9, 27 (2021).
  39. Наджип А.Э., Татарников А.М., Туми Д. и др., Астрофиз. бюлл. 72, 382 (2017) [A.M. Nadjip, D.W. Tatarnikov, D. Toomey, et al., Astrophys. Bull. 72, 349 (2017)].
  40. Окнянский и др. (V.L. Oknyansky, C.M. Gaskell, N.A. Huseynov, V.M. Lipunov, et al.), MNRAS 467, 1496 (2017).
  41. Окнянский В.Л., Письма в Астрон. журн. 19, 1021 (1993) [V.L. Oknyanskii, Astron. Lett. 19, 416 (1993)].
  42. Пирсон, Романи (A.L. Peirson and R.W. Romani), Astrophys. J. 885, 76 (2019).
  43. Райтери и др. (C.M. Raiteri, M. Villata, L. Bruschini, A. Capetti, O.M. Kurtanidze, V.M. Larionov, P. Romano, S. Vercellone, et al.), Astron. Astrophys. 524, A43 (2010).
  44. Райтери и др. (C.M. Raiteri, M. Villata, F. D’Ammando, V.M. Larionov, M.A. Gurwell, D.O. Mirzaqulov, P.S. Smith, J.A. Acosta-Pulido, et al.), MNRAS 436, 1530 (2013).
  45. Саакян, Джиомми (N. Sahakyan and P. Giommi), MNRAS 513, 4645 (2022).
  46. Самбруна и др. (R.M. Sambruna, L. Maraschi, and C. M. Urry), Astrophys. J. 463, 444 (1996).
  47. Сафонов Б.С., Лысенко П.А., Додин А.В., Письма в Астрон. журн. 43, 383 (2017) [B.S. Safonov, P.A. Lysenko, and A.V. Dodin, Astron. Lett. 43, 344 (2017)].
  48. Сикора и др. (M.С. Sikora, M.C. Begelman, G.M. Madejski, and J.-P. Lacosta), Astrophys. J. 625, 72 (2005).
  49. Скрутски и др. (M.F. Skrutskie, R.M. Cutri, R. Stiening, M.D. Weinberg, S. Schneider, J.M. Carpenter, C. Beichman, et al.), Astron. J. 131, 1163 (2006).
  50. Уголькова Л.С., Артамонов Б.П., Шимановская Е.В. и др., Письма в Астрон. журн. 43, 269 (2017) [L.S. Ugol’kova, B.P. Artamonov, E.V. Shimanovskaya, V.V. Bruevich, O. Burkhonov, Sh. A. Egamberdiev, and N.V. Metlova, Astron. Lett. 43, 233 (2017)].
  51. Уемура и др. (M. Uemura, M. Sasada, R. Itoh, et al.), in The First Year of MAXI: Monitoring Variable X-ray Sources, p. 45 (2010).
  52. Урри, Мушоцкий (C.M. Urry and R.F. Mushotzky), Astrophys. J. 253, 38 (1982).
  53. Урри, Падовани (C.M. Urry and P. Padovani), Publ. Astron. Soc. Pacific 107, 803 (1995).
  54. Хартман и др. (R.C. Hartman, D.L. Bertsch, S.D. Bloom, A.W. Chen, P. Deines-Jones, J.A. Esposito, C.E. Fichtel, D.P. Friedlander, et al.), Astrophys. J. Suppl. Ser. 123, 79 (1999).
  55. Шимановская и др. (E.V. Shimanovskaya, V.L. Oknyanskii, and B.P. Artamonov), Astron. Rep. 59, 12 (2015).

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