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Featured researches published by J. Becerra González.


arXiv: High Energy Astrophysical Phenomena | 2011

Testing the emission models of blazar jets with the MAGIC telescopes

J. Becerra González; A. Stamerra; K. Saito; D. Mazin; F. Tavecchio; L. Maraschi; E. Prandini; J. Sitarek; K. Berger; f. t. Magic

The MAGIC telescopes discovered very high energy (VHE, E>100 GeV) gamma-ray emission coming from the distant Flat Spectrum Radio Quasar (FSRQ) PKS 1222+21 (4C +21.35, z=0.432). It is the second most distant VHE gamma-ray source, with well measured redshift, detected until now. The observation was performed on 2010 June 17 (MJD 55364.9) using the two 17 m diameter imaging Cherenkov telescopes on La Palma (Canary Islands, Spain). The MAGIC detection coincides with high energy MeV/GeV gamma-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The averaged integral flux above 100 GeV is equivalent to 1 Crab Nebula flux. The VHE flux measured by MAGIC varies significantly within the 30 minutes of exposure implying a flux doubling time of about 10 minutes. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light, can be described by a single power law with photon index 2.72 ± 0.34 between 3 GeV and 400 GeV, consistent with gamma-ray emission belonging to a single component in the jet. The absence of a spectral cutoff at 30-60 GeV (indeed, one finds a strict lower limit Ec > 130 GeV) constrains the gamma-ray emission region to lie outside the broad line region, which would otherwise absorb the VHE gamma-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQs.


arXiv: High Energy Astrophysical Phenomena | 2013

VHE gamma-ray emission from the FSRQs observed by the MAGIC telescopes

E. Lindfors; K. Nilsson; U. Barres de Almeida; D. Mazin; D. Paneque; K. Saito; J. Becerra González; K. Berger; G. De Caneva; C. Schultz; J. Sitarek; A. Stamerra; F. Tavecchio; S. Buson; F. D'Ammando; M. Hayashida; M. Tornikoski; T. Hovatta


arXiv: High Energy Astrophysical Phenomena | 2009

MAGIC Collaboration: Contributions to the 31st International Cosmic Ray Conference (ICRC 2009)

H. Anderhub; L. A. Antonelli; P. Antoranz; M. Backes; C. Baixeras; S. Balestra; J. A. Barrio; D. Bastieri; J. Becerra González; J. Becker; W. Bednarek; K. Berger; E. Bernardini; A. Biland; R. Bock; G. Bonnoli; P. Bordas; D. Borla Tridon; V. Bosch-Ramon; D. Bose; I. Braun; T. Bretz; D. Britzger; M. Camara; E. Carmona; A. Carosi; P. Colin; S. Commichau; J. L. Contreras; J. Cortina


Archive | 2014

Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes (Research Note)

L. A. Antonelli; M. Asensio; M. Backes; U. Barres de Almeida; J. A. Barrio; J. Becerra González; K. Berger; E. Bernardini; A. Biland; A. Boller; S. Bonnefoy; G. Bonnoli; D. Borla Tridon; F. Borracci; D. Carreto Fidalgo; E. Colombo; Julio Contreras; J. Cortina; L. Cossio; F. Dazzi; B. De Lotto; C. Delgado Mendez; A. Domínguez; D. Dominis Prester; D. Dorner; D. Eisenacher; D. Elsaesser; D. Ferenc; M. V. Fonseca; L. Font

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J. A. Barrio

Complutense University of Madrid

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E. Bernardini

Humboldt University of Berlin

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