Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-20
Astrophys.J.642:L119-L122,2006
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures, submitted to ApJ
Scientific paper
10.1086/504845
The MAGIC collaboration has studied the high peaked BL-Lac object 1ES1218+30.4 at a redshift z = 0.182, using the MAGIC imaging air Cherenkov telescope located on the Canary island of La Palma. A gamma-ray signal was observed with 6.4sigma significance. The differential energy spectrum for an energy threshold of 120GeV can be fitted by a simple power law yielding F_E(E) = (8.1+-2.1)*10^-7 (E/250GeV)^(-3.0+-0.4) TeV^-1 m^-2 s^-1. During the six days of observation in January 2005 no time variability on time scales of days was found within the statistical errors. The observed integral flux above 350GeV is nearly a factor two below the the upper limit reported by the Whipple Collaboration in 2003.
Albert Jacques
Aliu Ester
Anderhub H.
Angelis Alessando de
Antoranz P.
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