Disentangling instrumental features of the 130 GeV Fermi line

Journal Article · Thu Nov 01 04:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/11/008· OSTI ID:22279677

Whiteson, Daniel ^[1]

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1. Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)

We study the instrumental features of photons from the peak observed at E{sub γ} = 130 GeV in the spectrum of Fermi-LAT data. We use the sPlots algorithm to reconstruct — seperately for the photons in the peak and for background photons — the distributions of quantities such as incident angles, the recorded time, features of the spacecraft position, the zenith angles, the conversion type and details of the energy and direction reconstruction. The presence of a striking feature or cluster in such a variable would suggest an instrumental cause for the peak. In the publically available data, we find several suggestive features which may inform further studies by instrumental experts, though the size of the signal sample is too small to draw statistically significant conclusions.

• OSTI ID: 22279677
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 11 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ALGORITHMS
ASTROPHYSICS
COSMOLOGY
ENERGY SPECTRA
GEV RANGE
PHOTONS