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Title: Disentangling instrumental features of the 130 GeV Fermi line

Abstract

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.

Authors:
 [1]
  1. Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
Publication Date:
OSTI Identifier:
22279677
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALGORITHMS; ASTROPHYSICS; COSMOLOGY; ENERGY SPECTRA; GEV RANGE; PHOTONS

Citation Formats

Whiteson, Daniel, E-mail: daniel@uci.edu. Disentangling instrumental features of the 130 GeV Fermi line. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/008.
Whiteson, Daniel, E-mail: daniel@uci.edu. Disentangling instrumental features of the 130 GeV Fermi line. United States. doi:10.1088/1475-7516/2012/11/008.
Whiteson, Daniel, E-mail: daniel@uci.edu. Thu . "Disentangling instrumental features of the 130 GeV Fermi line". United States. doi:10.1088/1475-7516/2012/11/008.
@article{osti_22279677,
title = {Disentangling instrumental features of the 130 GeV Fermi line},
author = {Whiteson, Daniel, E-mail: daniel@uci.edu},
abstractNote = {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.},
doi = {10.1088/1475-7516/2012/11/008},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}