Rapid and correlated variability of blazar S5 0716+71 from radio- to sub-mm bands

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dc.creatorFuhrmann, L.
dc.creatorKrichbaum, T. P.
dc.creatorWitzel, A.
dc.creatorAgudo, I.
dc.creatorBritzen, S.
dc.creatorBernhart, S.
dc.creatorImpellizzeri, V.
dc.creatorKraus, A.
dc.creatorAngelakis, E.
dc.creatorBach, U.
dc.creatorGabányi, K.
dc.creatorZensus, J. A.
dc.date2006-11-13
dc.date.accessioned2026-07-07T07:30:47Z
dc.date.available2026-07-07T07:30:47Z
dc.descriptionThe BL Lac object S5 0716+71 was target of a coordinated and global multi-frequency campaign to search for rapid and correlated variability and signatures of the inverse-Compton catastrophe. Here we present first results obtained from a combined analysis of the cm- to sub-mm observations over a period of seven days aiming at a detailed study of the intra- to inter-day variability characteristics and to obtain constraints on the variability brightness temperatures and Doppler factors comparing the radio data with the high energy emission recorded by INTEGRAL. A more detailed description of the whole cm- to sub-mm observations and our analysis/results will be presented in a forthcoming paper. Our analysis reveals the source to be in a particular short-term variability phase when compared to the past with a correlated >~4 day time scale amplitude increase of up to 35%, which is systematically more pronounced towards higher frequencies. The obtained frequency dependent variability amplitudes and time lags contradict expectations from interstellar scintillation and strongly suggest a source intrinsic origin of this inter-day variability. A 7-day spectral evolution study indicate time-variable synchrotron self-absorption and expansion of the emission region, consistent with standard models. Assuming relativistic boosting, our different estimates of the Doppler factor yield robust lower limits of D_var,IC > 5-22 using the inverse-Compton limit and D_var,eq > 8-33 using the equipartition argument. Although high, these values are in good agreement with Doppler factors obtained from recent VLBI studies and from the inverse-Compton Doppler factors D_IC > 14-16 derived with the X-ray emission seen by INTEGRAL at 3-200 keV.
dc.description6 pages, 3 figures, to appear in the proceedings of the 8th EVN symposium held in Torun, Poland, September 2006
dc.identifierhttps://arxiv.org/abs/astro-ph/0611391
dc.identifierhttp://arxiv.org/abs/astro-ph/0611391
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/118524
dc.subjectAstrophysics
dc.titleRapid and correlated variability of blazar S5 0716+71 from radio- to sub-mm bands
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