An excess of cosmic ray electrons at energies of 300–800 GeV

J. Chang, J. H. Adams, H. S. Ahn, G. L. Bashindzhagyan, M. Christl, O. Ganel, T. G. Guzik, J. Isbert, K. C. Kim, E. N. Kuznetsov, M. I. Panasyuk, A. D. Panov, W. K. H. Schmidt, E. S. Seo, N. V. Sokolskaya, J. W. Watts, J. P. Wefel (), J. Wu and V. I. Zatsepin
Additional contact information
J. Chang: Purple Mountain Observatory, CAS, 2 West Beijing Road, Nanjing 210008, China
J. H. Adams: Marshall Space Flight Center, Huntsville, Alabama 35812, USA
H. S. Ahn: University of Maryland, Institute for Physical Science & Technology, College Park, Maryland 20742, USA
G. L. Bashindzhagyan: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Leninskie gory, GSP1, Moscow 119991, Russia
M. Christl: Marshall Space Flight Center, Huntsville, Alabama 35812, USA
O. Ganel: University of Maryland, Institute for Physical Science & Technology, College Park, Maryland 20742, USA
T. G. Guzik: Louisiana State University, Baton Rouge, Louisiana 70803, USA
J. Isbert: Louisiana State University, Baton Rouge, Louisiana 70803, USA
K. C. Kim: University of Maryland, Institute for Physical Science & Technology, College Park, Maryland 20742, USA
E. N. Kuznetsov: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Leninskie gory, GSP1, Moscow 119991, Russia
M. I. Panasyuk: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Leninskie gory, GSP1, Moscow 119991, Russia
A. D. Panov: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Leninskie gory, GSP1, Moscow 119991, Russia
W. K. H. Schmidt: Max Planck Institute for Solar System Research, 2 Max Planck-Strasse, Katlenburg-Lindau 37191, Germany
E. S. Seo: University of Maryland, Institute for Physical Science & Technology, College Park, Maryland 20742, USA
N. V. Sokolskaya: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Leninskie gory, GSP1, Moscow 119991, Russia
J. W. Watts: Marshall Space Flight Center, Huntsville, Alabama 35812, USA
J. P. Wefel: Louisiana State University, Baton Rouge, Louisiana 70803, USA
J. Wu: University of Maryland, Institute for Physical Science & Technology, College Park, Maryland 20742, USA
V. I. Zatsepin: Skobeltsyn Institute of Nuclear Physics, Moscow State University, Leninskie gory, GSP1, Moscow 119991, Russia

Nature, 2008, vol. 456, issue 7220, 362-365

Abstract: High-energy cosmic rays The ATIC (Advanced Thin Ionizaton Calorimeter) cosmic-ray astronomy experiment sends helium balloons to altitudes of 35 km and more above Antarctica for up to 15 days at a time. These forays to the edge of space have resulted in the detection of an excess of Galactic cosmic-ray electrons at energies of around 300–800 GeV, which indicates a nearby source of energetic electrons. The source could be an unseen astrophysical object that accelerates electrons to those energies, or the electrons could arise from the annihilation of 'Kaluza-Klein' dark matter, an exotic concept predicted by theories of the Universe involving compactified extra dimensions.

Date: 2008
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DOI: 10.1038/nature07477

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