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.
Autori interni: | |
Autori: | Albert J; Aliu E; Anderhub H; Antoranz P; Armada A; Asensio M; Baixeras C; Barrio JA; Bartelt M; Bartko H; Bastieri D; Bavikadi SR; Bednarek W; Berger K; Bigongiari C; Biland A; Bisesi E; Bock RK; Bretz T; Britvitch I; Camara M; Chilingarian A; Ciprini S; Coarasa JA; Commichau S; Contreras JL; Cortina J; Curtef V; Danielyan V; Dazzi F; De Angelis A; de los Reyes R; De Lotto B; Domingo-Santamaria E; Dorner D; Doro M; Errando M; Fagiolini M; Ferenc D; Fernandez E; Firpo R; Flix J; Fonseca MV; Font L; Galante N; Garczarczyk M; Gaug M; Giller M; Goebel F; Hakobyan D; Hayashida M; Hengstebeck T; Hohne D; Hose J; Jacon P; Kalekin O; Kranich D; Laille A; Lenisa T; Liebing P; Lindfors E; Longo F; Lopez J; Lopez M; Lorenz E; Lucarelli F; Majumdar P; Maneva G; Mannheim K; Mariotti M; Martinez M; Mase K; Mazin D; Meucci M; Meyer M; Miranda JM; Mirzoyan R; Mizobuchi S; Moralejo A; Nilsson K; Ona-Wilhelmi E; Orduna R; Otte N; Oya I; Paneque D; Paoletti R; Pasanen M; Pascoli D; Pauss F; Pavel N; Pegna R; Persic M; Peruzzo L; Piccioli A; Poller M; Prandini E; Rhode W; Rico J; Riegel B; Rissi M; Robert A; Rugamer S; Saggion A; Sanchez A; Sartori P; Scalzotto V; Schmitt R; Schweizer T; Shayduk M; Shinozaki K; Shore S.N.; Sidro N; Sillanpaa A; Sobczynska D; Stamerra A; Stark LS; Takalo L; Temnikov P; Tescaro D; Teshima M; Tonello N; Torres A; Torres DF; Turini N; Vankov H; Vardanyan A; Vitale V; Wagner RM; Wibig T; Wittek W; Zapatero J |
Titolo: | Discovery of very high energy gamma rays from 1ES 1218+30.4 RID B-5372-2009 |
Anno del prodotto: | 2006 |
Digital Object Identifier (DOI): | 10.1086/504845 |
Appare nelle tipologie: | 1.1 Articolo in rivista |