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Title: Detection of very high energy radiation from the BL lacertae object PG 1553+113 with the MAGIC telescope
Author: MAGIC Collaboration
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Bosch i Ramon, Valentí
Keywords: Raigs gamma
Observatoris astronòmics
Gamma rays
Astronomical observatories
Issue Date: 2007
Publisher: Institute of Physics (IOP)
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.
Note: Reproducció del document publicat a:
It is part of: Astrophysical Journal, 2007, vol. 654, p. 119-122
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ISSN: 0004-637X
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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