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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 318245.0, MPI für Kernphysik / High-Energy Astrophysics
Discovery of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy
Authors:Abado, A. A.; Allen, B. T.; Berley, D.; Blaufuss, E.; Casanova, S.; Chen, C.; Coyne, D.; Delay, R. S.; Dingus, B. L.; Ellsworth, R. W.; Fleysher, L.; Fleysher, R.; Gebauer, I.; Gonzalez, M. M.; Goodman, J. A.; Hays, E.; Hoffman, C. M.; Kolterman, B. E.; Kelley, L. A.; Landsdell, C. P.; Linnemann J. T., J. T.; McEnery, J. E.; Mincer, A. I.; Moskalenko, I.; Nemethy, P.; Noyes, D.; Ryan, J. M.; Samuelson, F. W.; Saz Parkinson, P. M.; Schneider, M.; Shoup, A.; Sinnis, G.; Smith, A. J.; Strong, A. W.; Sullivan, G. W.; Vasileiou, V.; Walker, G. P.; Williams, D. A.; Xu, X. W.; Yodh, G. B.
Date of Publication (YYYY-MM-DD):2007-03-20
Title of Journal:Astrophysical Journal, Letters
Journal Abbrev.:ApJL
Issue / Number:Number 1, Part 2
Start Page:L33
End Page:L36
Copyright: American Astronomical Society. All rights reserved.
Review Status:not specified
Audience:Experts Only
Abstract / Description:The diffuse gamma radiation arising from the interaction of cosmic ray particles with matter and radiation in the Galaxy is one of the few probes available to study the origin of the cosmic rays. Milagro is a water Cherenkov detector that continuously views the entire overhead sky. The large field-of-view combined with the long observation time makes Milagro the most sensitive instrument available for the study of large, low surface brightness sources such as the diffuse gamma radiation arising from interactions of cosmic radiation with interstellar matter. In this paper we present spatial and flux measurements of TeV gamma-ray emission from the Cygnus Region.
The TeV image shows at least one new source MGRO J2019+37 as well as correlations with the matter density in the region as would be expected from cosmic-ray proton interactions. However, the TeV gamma-ray flux as measured at ~12 TeV from the Cygnus region (after excluding MGRO J2019+37) exceeds that predicted from a conventional model of cosmic ray production and propagation. This observation indicates the existence of either hard-spectrum cosmic-ray sources and/or other sources of TeV gamma rays in the region.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Guest Groups and Emeriti/H. J. Völk
External Affiliations:Department of Physics and Astronomy, Michigan State, USA University, 3245 BioMedical Physical Sciences Building, East Lansing, MI 48824, USA
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
Department of Physics, University of Maryland, College Park, MD 20742, USA
Group P-23, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
Department of Physics and Astronomy, George Mason University, 4400 University Drive, Fairfax, VA 22030, USA
Instituto de Astronomía, Universidad Nacional Autónoma de México, D.F., México, 04510, Mexico
High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439 and Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA
Department of Physics, New York University, 4 Washington Place, New York, NY 10003, USA
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Department of Physics, University of New Hampshire, Morse Hall, Durham, NH 03824-3525, USA
Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, USA
Santa Cruz Institute for Particle Physics, University of California, 1156 High Street, Santa Cruz, CA 95064 Ohio State University, Lima, OH 45804, USA
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