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 σ significance. The differential energy spectrum for an energy threshold of 120 GeV can be fitted by a simple power law, yielding FE(E)=(8.1+/-2.1)×10-7[E/(250 GeV)]-3.0+/-0.4 TeV-1 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|
|Citazione:||J., A., E., A., H., A., P., A., A., A., M., A., et al. (2006). Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4. THE ASTROPHYSICAL JOURNAL, 642(2), L119-L122.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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