Leventis, KonstantinosMarkoff, SeraWilms, JörnNowak, Michael A.Maitra, DipankarPottschmidt, KatjaPooley, Guy G.Kreykenbohm, IngoRothschild, Richard E.2023-10-052023-10-052009-04-15Leventis, Konstantinos, Sera Markoff, Joern Wilms, Michael A. Nowak, Dipankar Maitra, Katja Pottschmidt, Guy G. Pooley, Ingo Kreykenbohm, and Richard E. Rothschild. “Modelling a Simultaneous Radio/X-Ray Flare from Cyg X-1.” In Proceedings of VII Microquasar Workshop: Microquasars and Beyond — PoS(MQW7), 62:090. SISSA Medialab, 2009. https://doi.org/10.22323/1.062.0090.https://doi.org/10.22323/1.062.0090http://hdl.handle.net/11603/29989VII Microquasar Workshop: Microquasars and Beyond September 1-5 2008 Foca, Izmir, TurkeyThe long-term monitoring campaign of Cyg X-1 has provided the detection of the first simultaneous radio/X-ray flare seen from that source. We investigate the physical characteristics of the event in terms of emission from a homogeneous, expanding blob of pair-plasma, superimposed on a baseline flux in both bands. We find that while the radio flare can be reconstructed under various configurations of a cooling blob, continuous (re)acceleration of particles inside the jet is necessary to sustain X-ray emission at the levels implied by the data, for the observed duration. We present major results of the modelling and discuss implications for the role of microquasar jets.5 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Attribution-NonCommercial-ShareAlike 1.0 Generic (CC BY-NC-SA 1.0)https://creativecommons.org/licenses/by-nc-sa/1.0/Text