4.8 Article

Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth

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SCIENCE
卷 358, 期 6365, 页码 911-914

出版社

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan4880

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资金

  1. U.S. National Science Foundation (NSF)
  2. U.S. Department of Energy Office of High-Energy Physics
  3. Laboratory Directed Research and Development program of Los Alamos National Laboratory
  4. Consejo Nacional de Ciencia y Tecnologia, Mexico [271051, 232656, 260378, 179588, 239762, 254964, 271737, 258865, 243290, 132197, 281653, Catedras 873, 1563]
  5. Laboratorio Nacional HAWC de rayos gamma
  6. L'Oreal Fellowship for Women in Science
  7. Red HAWC, Mexico
  8. DGAPA-UNAM (Direccion General Asuntos del Personal Academico-Universidad Nacional Autonoma de Mexico) [IG100317, IN111315, IN111716-3, IA102715, 109916, IA102917]
  9. VIEP-BUAP (Vicerrectoria de Investigacion y Estudios de Posgrado-Benemerita Universidad Autonoma de Puebla)
  10. PIFI (Programa Integral de Fortalecimiento Institucional)
  11. PROFOCIE (Programa de Fortalecimiento de la Calidad en Instituciones Educativas)
  12. University of Wisconsin Alumni Research Foundation
  13. Institute of Geophysics, Planetary Physics, and Signatures at Los Alamos National Laboratory
  14. Polish Science Centre [DEC-2014/13/B/ST9/945]
  15. Coordinacion de la Investigacion Cientifica de la Universidad Michoacana
  16. Direct For Mathematical & Physical Scien
  17. Division Of Physics [1506145, 1606566] Funding Source: National Science Foundation

向作者/读者索取更多资源

The unexpectedly high flux of cosmic-ray positrons detected at Earth may originate from nearby astrophysical sources, dark matter, or unknown processes of cosmic-ray secondary production. We report the detection, using the High-Altitude Water Cherenkov Observatory (HAWC), of extended tera-electron volt gamma-ray emission coincident with the locations of two nearby middle-aged pulsars (Geminga and PSR B0656 + 14). The HAWC observations demonstrate that these pulsars are indeed local sources of accelerated leptons, but the measured tera-electron volt emission profile constrains the diffusion of particles away from these sources to be much slower than previously assumed. We demonstrate that the leptons emitted by these objects are therefore unlikely to be the origin of the excess positrons, which may have a more exotic origin.

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