ALGABA, Juan-Carlos; LEE, Sang-Sung; KIM, Dae-Won; RANI, Bindu; HODGSON, Jeffrey; KINO, Motoki; TRIPPE, Sascha; PARK, Jong-Ho; ZHAO, Guang-Yao; BYUN, Do-Young; GURWELL, Mark; KANG, Sin-Cheol; KIM, Jae-Young; KIM, Jeong-Sook; KIM, Soon-Wook; LOTT, Benoit; MIYAZAKI, Atsushi; WAJIMA, Kiyoaki

doi:10.3847/1538-4357/aa9e50

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Astrophys.J.. 2018, vol. 852, n° 1, p. 30

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We present multi-frequency simultaneous VLBI radio observations of the flat spectrum radio quasar 1633+382 (4C 38.41) as part of the interferometric monitoring of γ-ray-bright active galactic nuclei (iMOGABA) program combined with additional observations in the radio, optical, X-rays, and γ-rays carried out during the period 2012 March–2015 August. The monitoring of this source reveals a significant long-lived increase in its activity for approximately two years in the radio bands, which correlates with a similar increase in all other bands from submillimeter to γ-rays. A significant correlation is also found between radio fluxes and simultaneous spectral indices during this period. The study of the discrete correlation function indicates time lags smaller than the uncertainties of ∼40 days among both radio bands and high-energy bands, and a time lag of ∼70 days, with γ-rays leading radio emission. We interpret this as showing that the high-energy and radio fluxes arise from different emitting regions, located at 1 ± 13 and 40 ± 13 pc from the central engine respectively.< Réduire

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galaxies: jets

galaxies: individual

galaxies: active

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Exploring the Variability of the Flat Spectrum Radio Source 1633+382. I. Phenomenology of the Light Curves

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