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24 April 2024

» arxiv » 1002.2951

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Gamma-ray excess from a stacked sample of high-frequency peaked blazars observed with the MAGIC telescope
MAGIC Collaboration ; J. Aleksić ; L. A. Antonelli ; P. Antoranz ; M. Backes ; C. Baixeras ; J. A. Barrio ; D. Bastieri ; J. Becerra González ; W. Bednarek ; A. Berdyugin ; K. Berger ; E. Bernardini ; A. Biland ; O. Blanch ; R. K. 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 ; M. T. Costado ; S. Covino ; F. Dazzi ; A. De Angelis ; E. De Cea del Pozo ; R. De los Reyes ; B. De Lotto ; M. De Maria ; F. De Sabata ; C. Delgado Mendez ; M. Doert ; A. Domínguez ; D. Dominis Prester ; D. Dorner ; M. Doro ; D. Elsaesser ; M. Errando ; D. Ferenc ; M. V. Fonseca ; L. Font ; R. J. García López ; M. Garczarczyk ; M. Gaug ; N. Godinovic ; D. Hadasch ; A. Herrero ; D. Hildebrand ; D. Höhne-Mönch ; J. Hose ; D. Hrupec ; C. C. Hsu ; T. Jogler ; S. Klepser ; T. Krähenbühl ; D. Kranich ; A. La Barbera ; A. Laille ; E. Leonardo ; E. Lindfors ; S. Lombardi ; F. Longo ; M. López ; E Lorenz ; P. Majumdar ; G. Maneva ; N. Mankuzhiyil ; K. Mannheim ; L. Maraschi ; M. Mariotti ; M. Martínez ; D. Mazin ; M. Meucci ; J. M. Miranda ; R. Mirzoyan ; H. Miyamoto ; J. Moldón ; M. Moles ; A. Moralejo ; D. Nieto ; K. Nilsson ; J. Ninkovic ; R. Orito ; I. Oya ; S. Paiano ; R. Paoletti ; J. M. Paredes ; S. Partini ; M. Pasanen ; D. Pascoli ; F. Pauss ; R. G. Pegna ; M. A. Perez-Torres ; M. Persic ; L. Peruzzo ; F. Prada ; E. Prandini ; N. Puchades ; I. Puljak ; I. Reichardt ; W. Rhode ; M. Ribó ; J. Rico ; M. Rissi ; S. Rügamer ; A. Saggion ; T. Y. Saito ; M. Salvati ; M. Sánchez-Conde ; K. Satalecka ; V. Scalzotto ; V. Scapin ; C. Schultz ; T. Schweizer ; M. Shayduk ; S. N. Shore ; A. Sierpowska-Bartosik ; A. Sillanpää ; J Sitarek ; D. Sobczynska ; F. Spanier ; S. Spiro ; A. Stamerra ; B. Steinke ; J. C. Struebig ; T. Suric ; L. Takalo ; F. Tavecchio ; P. Temnikov ; T. Terzic ; D. Tescaro ; M. Teshima ; D. F. Torres ; H. Vankov ; R. M. Wagner ; Q. Weitzel ; V Zabalza ; F. Zandanel ; R. Zanin ;
Date:	15 Feb 2010
Abstract:	Between 2005 and 2009 a sample of 20 previously undetected high-frequency peaked blazars in the redshift range from 0.018 to 0.361 was observed with the MAGIC telescope at energies above 100 GeV. None of the sources was detected during the observations, hence we present here the 99.7 % confidence flux upper limits. The individual flux upper limits lie between 2.9 % and 14.7 % of the integral flux from the Crab Nebula. Applying a stacking method to the sample with a total of 349.4 hrs effective exposure time, we find evidence for an excess with a cumulative significance of 4.5 standard deviations. The integral flux above 150 GeV corresponds to 1.40 % of the one from the Crab Nebula. The result, if interpreted as a detection, provides clues on the baseline emission of high-frequency peaked blazars at very high Gamma-ray energies.
Source:	arXiv, 1002.2951
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