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Title: A TARGETED SEARCH FOR POINT SOURCES OF EeV NEUTRONS

A flux of neutrons from an astrophysical source in the Galaxy can be detected in the Pierre Auger Observatory as an excess of cosmic-ray air showers arriving from the direction of the source. To avoid the statistical penalty for making many trials, classes of objects are tested in combinations as nine ''target sets'', in addition to the search for a neutron flux from the Galactic center or from the Galactic plane. Within a target set, each candidate source is weighted in proportion to its electromagnetic flux, its exposure to the Auger Observatory, and its flux attenuation factor due to neutron decay. These searches do not find evidence for a neutron flux from any class of candidate sources. Tabulated results give the combined p-value for each class, with and without the weights, and also the flux upper limit for the most significant candidate source within each class. These limits on fluxes of neutrons significantly constrain models of EeV proton emission from non-transient discrete sources in the Galaxy.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ; ;  [15] ;  [16] ;  [17] ;  [18] more »; ; « less
  1. Universität Siegen, Siegen (Germany)
  2. Laboratório de Instrumentação e Física Experimental de Partículas-LIP and Instituto Superior Técnico-IST, Universidade de Lisboa-UL (Portugal)
  3. Osservatorio Astrofisico di Torino (INAF), Università di Torino and Sezione INFN, Torino (Italy)
  4. University of Wisconsin, Madison, WI (United States)
  5. Fermilab, Batavia, IL (United States)
  6. Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris 11, CNRS-IN2P3, Orsay (France)
  7. Universidade de São Paulo, Instituto de Física, São Paulo, SP (Brazil)
  8. Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche (Argentina)
  9. New York University, New York, NY (United States)
  10. Ohio State University, Columbus, OH (United States)
  11. Universidad Tecnológica Nacional-Facultad Regional Buenos Aires, Buenos Aires (Argentina)
  12. Universidad Nacional Autonoma de Mexico, Mexico, D. F. (Mexico)
  13. Universidad de Santiago de Compostela (Spain)
  14. Universität Hamburg, Hamburg (Germany)
  15. Università di Napoli "Federico II" and Sezione INFN, Napoli (Italy)
  16. IMAPP, Radboud University Nijmegen (Netherlands)
  17. University of Wisconsin, Milwaukee, WI (United States)
  18. Universidad Complutense de Madrid, Madrid (Spain)
Publication Date:
OSTI Identifier:
22365657
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 789; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; ATTENUATION; COSMIC NEUTRONS; COSMIC RAY FLUX; DATA ANALYSIS; EEV RANGE; MILKY WAY; NEUTRON FLUX; POINT SOURCES; TRANSIENTS