TY - JOUR
T1 - A near magnetic-to-kinetic energy equipartition flare from the relativistic jet in AO 0235 + 164 during 2013–2019
AU - Cheong, Whee Yeon
AU - Lee, Sang Sung
AU - Kim, Sang Hyun
AU - Kang, Sincheol
AU - Kim, Jae Young
AU - Rani, Bindu
AU - Readhead, Anthony C.S.
AU - Kiehlmann, Sebastian
AU - Lähteenmäki, Anne
AU - Tornikoski, Merja
AU - Tammi, Joni
AU - Ramakrishnan, Venkatessh
AU - Agudo, Iván
AU - Fuentes, Antonio
AU - Traianou, Efthalia
AU - Escudero, Juan
AU - Thum, Clemens
AU - Myserlis, Ioannis
AU - Casadio, Carolina
AU - Gurwell, Mark
N1 - Publisher Copyright:
© 2023 The Author(s).
PY - 2024/1/1
Y1 - 2024/1/1
N2 - We present the multiwavelength flaring activity of the blazar AO 0235 + 164 during its recent active period from 2013 to 2019. From a discrete correlation function analysis, we find a significant (> 95 per cent) correlation between radio and gamma-ray light curves with flares at longer wavelengths following flares at shorter wavelengths. We identify a new jet component in 43 GHz Very Long Baseline Array data that was ejected from the radio core on MJD 57246+−3026 (2015 August 12), during the peak of the 2015 radio flare. From the analysis of the jet component, we derived a Doppler factor of δvar = 28.5 ± 8.4, a bulk Lorentz factor of Γ = 16.8+−33.16, and an intrinsic viewing angle of θv = 1.42+−01.5207 degrees. Investigation of the quasi-simultaneous radio data revealed a partially absorbed spectrum with the turnover frequency varying in the range of 10−70 GHz and the peak flux density varying in the range of 0.7−4 Jy. We find the synchrotron self-absorption magnetic field strength to be BSSA = 15.3+−1412.06 mG at the peak of the 2015 radio flare, which is comparable to the equipartition magnetic field strength of BEQ = 43.6+−1010.46 mG calculated for the same epoch. Additional analysis of the radio emission region in the relativistic jet of AO 0235 + 164 suggests that it did not significantly deviate from equipartition during its recent flaring activity.
AB - We present the multiwavelength flaring activity of the blazar AO 0235 + 164 during its recent active period from 2013 to 2019. From a discrete correlation function analysis, we find a significant (> 95 per cent) correlation between radio and gamma-ray light curves with flares at longer wavelengths following flares at shorter wavelengths. We identify a new jet component in 43 GHz Very Long Baseline Array data that was ejected from the radio core on MJD 57246+−3026 (2015 August 12), during the peak of the 2015 radio flare. From the analysis of the jet component, we derived a Doppler factor of δvar = 28.5 ± 8.4, a bulk Lorentz factor of Γ = 16.8+−33.16, and an intrinsic viewing angle of θv = 1.42+−01.5207 degrees. Investigation of the quasi-simultaneous radio data revealed a partially absorbed spectrum with the turnover frequency varying in the range of 10−70 GHz and the peak flux density varying in the range of 0.7−4 Jy. We find the synchrotron self-absorption magnetic field strength to be BSSA = 15.3+−1412.06 mG at the peak of the 2015 radio flare, which is comparable to the equipartition magnetic field strength of BEQ = 43.6+−1010.46 mG calculated for the same epoch. Additional analysis of the radio emission region in the relativistic jet of AO 0235 + 164 suggests that it did not significantly deviate from equipartition during its recent flaring activity.
KW - BL Lacertae objects: individual: AO 0235 + 164
KW - galaxies: active
KW - galaxies: jets
KW - gamma-rays: galaxies
KW - radio continuum: galaxies
UR - http://www.scopus.com/inward/record.url?scp=85177495775&partnerID=8YFLogxK
U2 - 10.1093/mnras/stad3250
DO - 10.1093/mnras/stad3250
M3 - Article
AN - SCOPUS:85177495775
SN - 0035-8711
VL - 527
SP - 882
EP - 894
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -