RT Journal Article
T1 Discovery of very high energy gamma rays from 1ES 1218+30.4
A1 Antoranz Canales, Pedro
A1 Barrio Uña, Juan Abel
A1 Contreras González, José Luis
A1 Fonseca González, María Victoria
A1 López Moya, Marcos
A1 Miranda Pantoja, José Miguel
AB 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.
PB IOP Publishing
SN 0004-637X
YR 2006
FD 2006-05-10
LK https://hdl.handle.net/20.500.14352/50933
UL https://hdl.handle.net/20.500.14352/50933
LA eng
NO © The American Astronomical Society. We would like to thank the Instituto de Astrofísica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German Bundesministerium für Bildung und Forschung andMax-Planck-Gesellschaft, the Italian Istituto Nazionale de Fisica Nucleare, and the Spanish Comisión Interministerial de Ciencias y Tecnología is gratefully acknowledged. This work was also supported by ETH Research Grant TH 34/04 3 andgrant 1P03D01028 from the Polish Ministerstwo Nauki iInformatyzacji.
NO German Bundesministerium für Bildung und Forschung
NO Max-Planck-Gesellschaft
NO Italian Istituto Nazionale de Fisica Nucleare
NO Spanish Comisión Interministerial de Ciencias y Tecnología
NO ETH
NO Polish Ministerstwo Nauki i Informatyzacji
DS Docta Complutense
RD 10 abr 2025