Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4

Albert, J.; Aliu, E.; Anderhub, H.; Antoranz, P.; Armada, A.; Asensio, M.; Baixeras, C.; Barrio, J. A.; Bartelt, M.; Bartko, H.; Bastieri, Denis; Bavikadi, S. R.; Bednarek, W.; Berger, K.; Bigongiari, C.; Biland, A.; Bisesi, E.; Bock, R. K.; Bretz, T.; Britvitch, I.; Camara, M.; Chilingarian, A.; Ciprini, S.; Coarasa, J. A.; Commichau, S.; Contreras, J. L.; Cortina, J.; Curtef, V.; Danielyan, V.; Dazzi, Francesco; De Angelis, A.; De Los Reyes, R.; De Lotto, B.; Domingo Santamara, E.; Dorner, D.; Doro, Michele; Errando, M.; Fagiolini, M.; Ferenc, D.; Fernndez, E.; Firpo, R.; Flix, J.; Fonseca, M. V.; Font, L.; Galante, N.; Garczarczyk, M.; Gaug, M.; Giller, M.; Goebel, F.; Hakobyan, D.; Hayashida, M.; Hengstebeck, T.; Hhne, D.; Hose, J.; Jacon, P.; Kalekin, O.; Kranich, D.; Laille, A.; Lenisa, T.; Liebing, P.; Lindfors, E.; Longo, F.; Lpez, J.; Lpez, M.; Lorenz, E.; Lucarelli, F.; Majumdar, P.; Maneva, G.; Mannheim, K.; Mariotti, Mose'; Martnez, M.; Mase, K.; Mazin, D.; Meucci, M.; Meyer, M.; Miranda, J. M.; Mirzoyan, R.; Mizobuchi, S.; Moralejo, A.; Nilsson, K.; Oa Wilhelmi, E.; Ordua, R.; Otte, N.; Oya, I.; Paneque, D.; Paoletti, R.; Pasanen, M.; Pascoli, Donatella; Pauss, F.; Pavel, N.; Pegna, R.; Persic, M.; Peruzzo, Luigi; Piccioli, A.; Poller, M.; Prandini, Elisa; Rhode, W.; Rico, J.; Riegel, B.; Rissi, M.; Robert, A.; Rgamer, S.; Saggion, Antonio; Snchez, A.; Sartori, Paolo; Scalzotto, Villi Mario; Schmitt, R.; Schweizer, T.; Shayduk, M.; Shinozaki, K.; Shore, S. N.; Sidro, N.; Sillanp, A.; Sobczy Ska, D.; Stamerra, A.; Stark, L. S.; Takalo, L.; Temnikov, P.; Tescaro, D.; Teshima, M.; Tonello, N.; Torres, A.; Torres, D. F.; Turini, N.; Vankov, H.; Vardanyan, A.; Vitale, V.; Wagner, R. M.; Wibig, T.; Wittek, W.; Zapatero, And J.

doi:10.1086/504845

The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218 + 30.4, at a redshift z = 0.182, using the MAGIC imaging air Cerenkov telescope located on the Canary Island of La Palma. A gamma-ray signal was observed with 6.4 sigma significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding F-E = (8.1 +/- 2.1) x 10(-7)[E/(250 GeV)](-3.0 +/- 0.4) TeV-1 F (E) m(-2) s(-1). During the 6 days of observation in 2005 January, no time variability on timescales of days was found within the statistical errors. The observed integral flux above 350 GeV is nearly a factor of 2 below the upper limit reported by the Whipple collaboration in 2003.

Titolo:	Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4
Autori:	J. ALBERT E. ALIU H. ANDERHUB P. ANTORANZ A. ARMADA M. ASENSIO C. BAIXERAS J. A. BARRIO M. BARTELT H. BARTKO BASTIERI, DENIS S. R. BAVIKADI W. BEDNAREK K. BERGER C. BIGONGIARI A. BILAND E. BISESI R. K. BOCK T. BRETZ I. BRITVITCH M. CAMARA A. CHILINGARIAN S. CIPRINI J. A. COARASA S. COMMICHAU J. L. CONTRERAS J. CORTINA V. CURTEF V. DANIELYAN DAZZI, FRANCESCO A. DE ANGELIS R. DE LOS REYES B. DE LOTTO E. DOMINGO SANTAMARA D. DORNER DORO, MICHELE M. ERRANDO M. FAGIOLINI D. FERENC E. FERNNDEZ R. FIRPO J. FLIX M. V. FONSECA L. FONT N. GALANTE M. GARCZARCZYK M. GAUG M. GILLER F. GOEBEL D. HAKOBYAN M. HAYASHIDA T. HENGSTEBECK D. HHNE J. HOSE P. JACON O. KALEKIN D. KRANICH A. LAILLE T. LENISA P. LIEBING E. LINDFORS F. LONGO J. LPEZ M. LPEZ E. LORENZ F. LUCARELLI P. MAJUMDAR G. MANEVA K. MANNHEIM MARIOTTI, MOSE' M. MARTNEZ K. MASE D. MAZIN M. MEUCCI M. MEYER J. M. MIRANDA R. MIRZOYAN S. MIZOBUCHI A. MORALEJO K. NILSSON E. OA WILHELMI R. ORDUA N. OTTE I. OYA D. PANEQUE R. PAOLETTI M. PASANEN PASCOLI, DONATELLA F. PAUSS N. PAVEL R. PEGNA M. PERSIC PERUZZO, LUIGI A. PICCIOLI M. POLLER PRANDINI, ELISA W. RHODE J. RICO B. RIEGEL M. RISSI A. ROBERT S. RGAMER SAGGION, ANTONIO A. SNCHEZ SARTORI, PAOLO SCALZOTTO, VILLI MARIO R. SCHMITT T. SCHWEIZER M. SHAYDUK K. SHINOZAKI S. N. SHORE N. SIDRO A. SILLANP D. SOBCZY SKA A. STAMERRA L. S. STARK L. TAKALO P. TEMNIKOV D. TESCARO M. TESHIMA N. TONELLO A. TORRES D. F. TORRES N. TURINI H. VANKOV A. VARDANYAN V. VITALE R. M. WAGNER T. WIBIG W. WITTEK AND J. ZAPATERO mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2006
Rivista:	THE ASTROPHYSICAL JOURNAL
Abstract:	The MAGIC collaboration has studied the high-frequency-peaked BL Lac object 1ES 1218 + 30.4, at a redshift z = 0.182, using the MAGIC imaging air Cerenkov telescope located on the Canary Island of La Palma. A gamma-ray signal was observed with 6.4 sigma significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding F-E = (8.1 +/- 2.1) x 10(-7)[E/(250 GeV)](-3.0 +/- 0.4) TeV-1 F (E) m(-2) s(-1). During the 6 days of observation in 2005 January, no time variability on timescales of days was found within the statistical errors. The observed integral flux above 350 GeV is nearly a factor of 2 below the upper limit reported by the Whipple collaboration in 2003.
Handle:	http://hdl.handle.net/11577/137283
Appare nelle tipologie:	01.01 - Articolo in rivista

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