PoS - Proceedings of Science
Volume 344 - 14th European VLBI Network Symposium & Users Meeting (EVN2018) - Posters about AGN
Origin and Evolution of the Multi–band Variability in the Flat Spectrum Radio Source 4C 38.41
J.C. Algaba*, S.S. Lee, B. Rani, D.W. Kim, M. Kino, J.A. Hodgson, G.Y. Zhao, D.Y. Byun, M.A. Gurwell, S.C. Kang, J.Y. Kim, J.S. Kim, S.W. Kim, J.H. Park, S. Trippe and K. Wajima
Full text: pdf
Pre-published on: May 14, 2019
Published on: October 09, 2019
The flat spectrum radio quasar 4C 38.41 showed a significant increase of its radio flux density during the period 2012 March - 2015 August which correlates with gamma-ray flaring activity. Multi-frequency simultaneous VLBI observations were conducted as part of the interferometric monitoring of gamma-ray bright active galactic nuclei (iMOGABA) program and supplemented with additional monitoring observations at various bands across the electromagnetic spectrum. The epochs of the maxima for the two largest gamma-ray flares coincide with the ejection of two respective new VLBI components and the evolution of the physical properties seem to be in agreement with the shock-in-jet model. Derived synchrotron self absorption magnetic fields, of the order of 0.1 mG, do not seem to dramatically change during the flares, and are much smaller, by a factor 10,000, than the estimated equipartition magnetic fields, indicating that the source of the flare may be associated with a particle dominated emitting region.
DOI: https://doi.org/10.22323/1.344.0090
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