E. Ferrero
Heidelberg University
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Featured researches published by E. Ferrero.
Astronomy and Astrophysics | 2006
L. Ostorero; S. J. Wagner; J. Gracia; E. Ferrero; R. Strom
Context. Some intra-day variable, compact extra-galactic radio sources show brightness temperatures severely exceeding 10 12 K, the limit set by catastrophic inverse-Compton (IC) cooling in sources of incoherent synchrotron radiation. The violation of the IC limit, actually possible under non-stationary conditions, would lead to IC avalanches in the soft- γ -ray energy band during transient periods. Aims. For the first time, broadband signatures of possible IC catastrophes were searched for in a prototypical source, S5 0716+71. Methods. A multifrequency observing campaign targetting S5 0716+71 was carried out during November 06-20, 2003. The observations, organized under the framework of the European Network for the Investigation of Galactic nuclei through Multifrequency Analysis (ENIGMA) together with a campaign by the Whole Earth Blazar Telescope (WEBT), involved a pointing by the soft- γ -ray satellite INTEGRAL, optical, near-infrared, sub-millimeter, millimeter, radio, as well as Very Long Baseline Array (VLBA) monitoring. Results. S5 0716+71 was very bright at radio frequencies and in a rather faint optical state (
Astronomy and Astrophysics | 2006
E. Ferrero; S. J. Wagner; D. Emmanoulopoulos; L. Ostorero
R =14.17{-}13.64