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DEEP MORPHOLOGICAL and SPECTRAL STUDY of the SNR RCW 86 with FERMI-LAT

  • M. Ajello
  • , L. Baldini
  • , G. Barbiellini
  • , D. Bastieri
  • , R. Bellazzini
  • , E. Bissaldi
  • , E. D. Bloom
  • , R. Bonino
  • , E. Bottacini
  • , T. J. Brandt
  • , J. Bregeon
  • , P. Bruel
  • , R. Buehler
  • , G. A. Caliandro
  • , R. A. Cameron
  • , M. Caragiulo
  • , E. Cavazzuti
  • , E. Charles
  • , A. Chekhtman
  • , S. Ciprini
  • J. Cohen-Tanugi, B. Condon, F. Costanza, S. Cutini, F. D'Ammando, F. De Palma, R. Desiante, N. Di Lalla, M. Di Mauro, L. Di Venere, P. S. Drell, G. Dubner, D. Dumora, L. Duvidovich, C. Favuzzi, W. B. Focke, P. Fusco, F. Gargano, D. Gasparrini, E. Giacani, N. Giglietto, T. Glanzman, D. A. Green, I. A. Grenier, S. Guiriec, E. Hays, J. W. Hewitt, A. B. Hill, D. Horan, T. Jogler, G. Jóhannesson, I. Jung-Richardt, S. Kensei, M. Kuss, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, J. Magill, S. Maldera, A. Manfreda, M. Mayer, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, M. Negro, E. Nuss, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, J. S. Perkins, M. Pesce-Rollins, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, J. Schmid, A. Schulz, C. Sgrò, D. Simone, E. J. Siskind, F. Spada, G. Spandre, P. Spinelli, J. B. Thayer, L. Tibaldo, D. F. Torres, G. Tosti, E. Troja, Y. Uchiyama, G. Vianello, J. Vink, K. S. Wood, M. Yassine
  • Clemson University
  • University of Pisa
  • Kavli Institute for Particle Astrophysics and Cosmology
  • INFN Sezione di Trieste
  • University of Trieste
  • INFN
  • University of Padova
  • Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
  • INFN Sezione di Bari
  • INFN Sezione di Torino
  • University of Turin
  • NASA Goddard Space Flight Center
  • Laboratoire Univers et Particules de Montpellier
  • c/o DESY
  • Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
  • Politecnico di Bari
  • Science and Research Directorate
  • George Mason University
  • INFN Sezione di Perugia
  • UMR 5797
  • Osservatorio Astronomico di Roma
  • INAF Istituto di Radioastronomia
  • University of Bologna
  • Università Telematica Pegaso
  • and Physics University of Udine
  • Instituto de Astronomía y Física del Espacio
  • University of Cambridge
  • Universite Paris-Saclay
  • University of North Florida
  • University of Southampton
  • University of Iceland
  • Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
  • Hiroshima University
  • KTH Royal Institute of Technology
  • Oskar Klein Centre
  • University of Sheffield
  • Naval Research Laboratory
  • University of Maryland
  • Faculty of Science, Mahidol University
  • Sezione di Roma
  • University of Denver
  • Max-Planck-Institut für Physik
  • University and Research
  • Medical University of Innsbruck
  • NYCB Real-Time Computing Inc.
  • Max-Planck-Institut für Kernphysik
  • Pompeu Fabra University (UPF)
  • University of Perugia
  • Department of Physics
  • University of Amsterdam

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

RCW 86 is a young supernova remnant (SNR) showing a shell-type structure at several wavelengths and is thought to be an efficient cosmic-ray (CR) accelerator. Earlier Fermi Large Area Telescope results reported the detection of γ-ray emission coincident with the position of RCW 86 but its origin (leptonic or hadronic) remained unclear due to the poor statistics. Thanks to 6.5 years of data acquired by the Fermi-LAT and the new event reconstruction Pass 8, we report the significant detection of spatially extended emission coming from RCW 86. The spectrum is described by a power-law function with a very hard photon index in the 0.1-500 GeV range and an energy flux above 100 MeV of erg cm-2 s-1. Gathering all the available multiwavelength (MWL) data, we perform a broadband modeling of the nonthermal emission of RCW 86 to constrain parameters of the nearby medium and bring new hints about the origin of the γ-ray emission. For the whole SNR, the modeling favors a leptonic scenario in the framework of a two-zone model with an average magnetic field of 10.2 ±0.7 μG and a limit on the maximum energy injected into protons of 2 ×1049 erg for a density of 1 cm-3. In addition, parameter values are derived for the north-east and south-west (SW) regions of RCW 86, providing the first indication of a higher magnetic field in the SW region.

langue originaleAnglais
Numéro d'article98
journalAstrophysical Journal
Volume819
Numéro de publication2
Les DOIs
étatPublié - 10 mars 2016

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