5 Papers
130 Citations
J. Gracia is an academic researcher from National and Kapodistrian University of Athens. The author has contributed to research in topics: Blazar & Brightness temperature. The author has an hindex of 5, co-authored 5 publications.
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Papers
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71. I. Simultaneous broadband observations during November 2003
L. Ostorero,L. Ostorero,Stefan Wagner,J. Gracia,E. Ferrero,Thomas P. Krichbaum,Silke Britzen,A. Witzel,Kari Nilsson,M. Villata,Uwe Bach,Uwe Bach,D. Barnaby,S. Bernhart,Michael T. Carini,C. W. Chen,Wen Ping Chen,Stefano Ciprini,Stefano Ciprini,S. Crapanzano,V. T. Doroshenko,N. V. Efimova,Dimitrios Emmanoulopoulos,Lars Fuhrmann,Lars Fuhrmann,Lars Fuhrmann,Krisztina É. Gabányi,A. Giltinan,Vladimir A. Hagen-Thorn,M. Hauser,Jochen Heidt,A. S. Hojaev,A. S. Hojaev,A. S. Hojaev,Talvikki Hovatta,Filip Hroch,Mansur Ibrahimov,V. Impellizzeri,R. Z. Ivanidze,D. Kachel,Alexander Kraus,O. M. Kurtanidze,O. M. Kurtanidze,Anne Lähteenmäki,L. Lanteri,Valeri M. Larionov,Z. Y. Lin,Elina Lindfors,Filip Münz,Maria G. Nikolashvili,Giuliano Nucciarelli,A. O'Connor,J. M. Ohlert,M. Pasanen,C. Pullen,C. M. Raiteri,Travis A. Rector,Russell M. Robb,Lorand A. Sigua,A. Sillanpää,L. Sixtova,N. Smith,P. Strub,S. Takahashi,L. O. Takalo,C. Tapken,J. Tartar,Merja Tornikoski,G. Tosti,M. Tröller,R. Walters,Bruce A. Wilking,W. Wills,Iván Agudo,Hugh D. Aller,Margo F. Aller,Emmanouil Angelakis,J. Klare,Elmar Körding,Richard G. Strom,Richard G. Strom,Harri Teräsranta,H. Ungerechts,B. Vila-Vilaró +83 more
TL;DR: In this paper, broadband signatures of possible IC catastrophes were searched for in a prototypical radio source, S5 0716+71, during a multifrequency observing campaign targetting S5 716 +71 was carried out during November 06-20, 2003.
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Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71. I. Simultaneous broadband observations during November 2003
L. Ostorero,Stefan Wagner,J. Gracia,E. Ferrero,Thomas P. Krichbaum,Silke Britzen,A. Witzel,K. Nilsson,M. Villata +8 more
TL;DR: In this paper, a multifrequency observing campaign targeting S5 0716+71 was carried out 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), involving a pointing by the soft-gamma-ray satellite INTEGRAL, optical, near-infrared, sub-millimeter, millimeter, radio, and very long baseline array (VLBA) monitoring.
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Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71 II. A search for intra-day variability at millimetre wavelengths with the IRAM 30 m telescope
Iván Agudo,Thomas P. Krichbaum,H. Ungerechts,Alex Kraus,A. Witzel,Emmanouil Angelakis,Lars Fuhrmann,Lars Fuhrmann,Lars Fuhrmann,U. Bach,U. Bach,Silke Britzen,J. A. Zensus,Stefan Wagner,L. Ostorero,E. Ferrero,J. Gracia,Michael Grewing +17 more
TL;DR: In this paper, a densely time sampled polarimetric flux density monitoring of the BL Lac object S5 0716+71 at 86 GHz and 229 GHz was performed with the IRAM 30 m telescope at Pico Veleta within a coordinated multi-frequency observing campaign, which was centred around a 500 ks INTEGRAL observation during November 10 to 16, 2003.
Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71: II. A search for intra-day variability at millimetre wavelengths with the IRAM 30 m telescope
Iván Agudo,Thomas P. Krichbaum,H. Ungerechts,Alex Kraus,A. Witzel,Emmanouil Angelakis,Lars Fuhrmann,U. Bach,Silke Britzen,J. A. Zensus,Stefan Wagner,L. Ostorero,E. Ferrero,J. Gracia,Michael Grewing +14 more
TL;DR: In this paper, a densely time sampled polarimetric flux density monitoring of the BL Lac object S5 0716+71 at 86 GHz and 229 GHz with the IRAM 30 m telescope within a coordinated broad spectral band campaign was performed.
Magnetic collimation of the relativistic jet in M 87
TL;DR: In this paper, a two-zone MHD model was applied to the jet of M87, which consists of an inner relativistic outflow, which is surrounded by a non-relativistic outer disk-wind.