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Abstract:

A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1 - 2 EeV are found, which is compatible with the expected hadroninduced background. Upper limits on the integral flux of ultra-high energy photons of 0.027, 0.009, 0.008, 0.008 and 0.007 km -2 sr -1 yr -1 are derived at 95% C.L. for energy thresholds of 1, 2, 3, 5 and 10 EeV. These limits bound the fractions of photons in the all-particle integral flux below 0.1%, 0.15%, 0.33%, 0.85% and 2.7%. For the first time the photon fraction at EeV energies is constrained at the sub-percent level. The improved limits are below the flux of diffuse photons predicted by some astrophysical scenarios for cosmogenic photon production. The new results rule-out the early top-down models - in which ultra-high energy cosmic rays are produced by, e.g., the decay of super-massive particles - and challenge the most recent super-heavy dark matter models.

Registro:

Documento: Artículo
Título:Search for photons with energies above 10 18 eV using the hybrid detector of the Pierre Auger Observatory
Autor:Multitudinario:399
Filiación:Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), Argentina
Centro de Investigaciones en Láseres y Aplicaciones, CITEDEF and CONICET, Argentina
Departamento de Fisica and Departamento de Ciencias de la Atmosfera y Los Oceanos, FCEyN, Universidad de Buenos Aires, Argentina
IFLP, Universidad Nacional de la Plata and CONICET, Argentina
Instituto de Astronomía y Física Del Espacio (IAFE, CONICET-UBA), Argentina
Inst. de Fis. de Rosario - CONICET/U.N.R. and Fac. de Ciencias Bioquimicas y Farmaceuticas U.N.R., Argentina
Instituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM), Universidad Tecnológica Nacional, Facultad Regional Mendoza (CONICET/CNEA), Argentina
Instituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM), Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Argentina
Observatorio Pierre Auger, Argentina
Observatorio Pierre Auger and Comisión Nacional de Energía Atómica, Argentina
Universidad Tecnológica Nacional, Facultad Regional Buenos Aires, Argentina
University of Adelaide, Australia
Centro Brasileiro de Pesquisas Fisicas (CBPF), Brazil
Universidade de São Paulo, Escola de Engenharia de Lorena, Brazil
Universidade de São Paulo, Inst. de Física de São Carlos, São Carlos, Brazil
Universidade de São Paulo, Inst. de Física, São Paulo, Brazil
Universidade Estadual de Campinas (UNICAMP), Brazil
Universidade Estadual de Feira de Santana (UEFS), Brazil
Universidade Federal de Pelotas, Brazil
Universidade Federal Do ABC (UFABC), Brazil
Universidade Federal Do Paraná, Setor Palotina, Brazil
Universidade Federal Do Rio de Janeiro (UFRJ), Instituto de Física, Brazil
Universidade Federal Fluminense, Brazil
Universidad Industrial de Santander, Colombia
Institute of Physics (FZU) of the Academy of Sciences of the Czech Republic, Czech Republic
Palacky University, RCPTM, Czech Republic
University Prague, Institute of Particle and Nuclear Physics, Czech Republic
Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud, Univ. Paris/Saclay, CNRS-IN2P3, France
Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, France
Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Grenoble-Alpes, CNRS/IN2P3, France
Bergische Universität Wuppertal, Department of Physics, Germany
Karlsruhe Institute of Technology, Institut für Experimentelle Kernphysik (IEKP), Germany
Karlsruhe Institute of Technology, Institut für Kernphysik (IKP), Germany
Karlsruhe Institute of Technology, Institut für Prozessdatenverarbeitung und Elektronik (IPE), Germany
RWTH Aachen University, III. Physikalisches Institut A, Germany
Universitat Hamburg, II. Institut für Theoretische Physik, Germany
Universitat Siegen, Fachbereich 7 Physik - Experimentelle Teilchenphysik, Germany
Gran Sasso Science Institute (INFN), L'Aquila, Italy
INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, Italy
INFN Laboratori Nazionali Del Gran Sasso, Italy
INFN, Gruppo Collegato dell'Aquila, Italy
INFN, Sezione di Catania, Italy
INFN, Sezione di Lecce, Italy
INFN, Sezione di Milano, Italy
INFN, Sezione di Napoli, Italy
INFN, Sezione di Roma Tor Vergata, Italy
INFN, Sezione di Torino, Italy
Osservatorio Astrofisico di Torino (INAF), Torino, Italy
Universita Del Salento, Dipartimento di Ingegneria, Italy
Universita Del Salento, Dipartimento di Matematica e Fisica E. de Giorgi, Italy
Universita dell'Aquila, Dipartimento di Scienze Fisiche e Chimiche, Italy
Universita di Catania, Dipartimento di Fisica e Astronomia, Italy
Universita di Milano, Dipartimento di Fisica, Italy
Universita di Napoli Federico II, Dipartimento di Fisica Ettore Pancini, Italy
Universita di Roma Tor Vergata, Dipartimento di Fisica, Italy
Universita Torino, Dipartimento di Fisica, Italy
Benemérita Universidad Autónoma de Puebla (BUAP), Mexico
Centro de Investigación y de Estudios Avanzados Del IPN (CINVESTAV), Mexico
U. Profesional Interdisciplinaria en Ing. y Tecnologias Avanzadas Del Instituto Politecnico Nacional, Mexico
Universidad Autónoma de Chiapas, Mexico
Universidad Michoacana de San Nicolás de Hidalgo, Mexico
Universidad Nacional Autónoma de México, Mexico
Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud Universiteit, Nijmegen, Netherlands
KVI - Center for Advanced Radiation Technology, University of Groningen, Netherlands
Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Netherlands
Stichting Astronomisch Onderzoek in Nederland (ASTRON), Dwingeloo, Netherlands
Institute of Nuclear Physics PAN, Poland
University of Łódź, Faculty of Astrophysics, Poland
University of Łódź, Faculty of High-Energy Astrophysics, Poland
Laboratorio de Instrumentacao e Fis. Exp. de Particulas - LIP and Instituto Superior Tecnico - IST, Universidade de Lisboa - UL, Portugal
Horia Hulubei National Institute for Physics and Nuclear Engineering, Romania
Institute of Space Science, Romania
University of Bucharest, Physics Department, Romania
University Politehnica of Bucharest, Romania
Experimental Particle Physics Department, J. Stefan Institute, Slovenia
Laboratory for Astroparticle Physics, University of Nova Gorica, Slovenia
Universidad Complutense de Madrid, Spain
Universidad de Granada and C.A.F.P.E., Spain
Universidad de Santiago de Compostela, Spain
Case Western Reserve University, United States
Colorado School of Mines, United States
Colorado State University, United States
Department of Physics and Astronomy, Lehman College, City University of New York, United States
Louisiana State University, United States
Michigan Technological University, United States
New York University, United States
Northeastern University, United States
Ohio State University, United States
Pennsylvania State University, United States
University of Chicago, United States
University of Hawaii, United States
University of Nebraska, United States
University of New Mexico, United States
School of Physics and Astronomy, University of Leeds, Leeds, United Kingdom
Max-Planck-Institut für Radioastronomie, Bonn, Germany
Vrije Universiteit Brussels, Brussels, Belgium
Deutsches Elektronen-Synchrotron (DESY), Zeuthen, Germany
SUBATECH, École des Mines de Nantes, CNRS-IN2P3, Université de Nantes, France
Fermi National Accelerator Laboratory, United States
Año:2017
Volumen:2017
Número:4
DOI: http://dx.doi.org/10.1088/1475-7516/2017/04/009
Título revista:Journal of Cosmology and Astroparticle Physics
Título revista abreviado:J. Cosmol. Astroparticle Phys.
ISSN:14757516
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_14757516_v2017_n4_p_Multitudinario

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Citas:

---------- APA ----------
(2017) . Search for photons with energies above 10 18 eV using the hybrid detector of the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 2017(4).
http://dx.doi.org/10.1088/1475-7516/2017/04/009
---------- CHICAGO ----------
Multitudinario:399. "Search for photons with energies above 10 18 eV using the hybrid detector of the Pierre Auger Observatory" . Journal of Cosmology and Astroparticle Physics 2017, no. 4 (2017).
http://dx.doi.org/10.1088/1475-7516/2017/04/009
---------- MLA ----------
Multitudinario:399. "Search for photons with energies above 10 18 eV using the hybrid detector of the Pierre Auger Observatory" . Journal of Cosmology and Astroparticle Physics, vol. 2017, no. 4, 2017.
http://dx.doi.org/10.1088/1475-7516/2017/04/009
---------- VANCOUVER ----------
Multitudinario:399. Search for photons with energies above 10 18 eV using the hybrid detector of the Pierre Auger Observatory. J. Cosmol. Astroparticle Phys. 2017;2017(4).
http://dx.doi.org/10.1088/1475-7516/2017/04/009