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Detection of very high energy radiation from the BL lacertae object PG 1553+113 with the MAGIC telescope

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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.

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MAGIC Collaboration, et al. Detection of very high energy radiation from the BL lacertae object PG 1553+113 with the MAGIC telescope. Astrophysical Journal. 2007. Vol. 654, num. 119-122. ISSN 0004-637X. [consulted: 19 of August of 2026]. Available at: https://hdl.handle.net/2445/150593

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