Abstract
In 2005 and 2006, the MAGIC telescope observed very high energy gamma-ray emission from the distant BL Lac object PG 1553 + 113. The overall significance of the signal was 8.8 σ for 18.8 hr of observation time. The light curve shows no significant flux variations on a daily timescale; the flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between ∼90 and 500 GeV is well described by a power law with photon index Γ = 4.2 ± 0.3. The combined 2005 and 2006 energy spectrum provides an upper limit of z = 0.74 on the redshift of the object.
| Original language | English |
|---|---|
| Pages (from-to) | L119-L122 |
| Journal | Astrophysical Journal |
| Volume | 654 |
| Issue number | 2 II |
| DOIs | |
| State | Published - Jan 10 2007 |
Keywords
- Gamma rays: observations
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