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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.

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 [10.1086/504845].

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

STAMERRA, ANTONIO;TURINI, NICOLA;
2006-01-01

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 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.
2006
THE ASTROPHYSICAL JOURNAL
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 [10.1086/504845].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/43346
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