A. Archer, Anna Barnacka, M. Beilicke, W. Benbow, K. Berger, R. Bird, Jonathan Biteau, J. H. Buckley, V. Bugaev, K. Byrum, J. V. Cardenzana, M. Cerruti, W. Chen, Xiaoming Chen, L. Ciupik, M. P. Connolly, W. Cui, H. J. Dickinson, J. Dumm, J. D. Eisch, A. Falcone, Simone Federici, Q. Feng, J. P. Finley, H. Fleischhack, L. Fortson, A. Furniss, N. Galante, S. Griffin, S. T. Griffiths, J. Grube, G. Gyuk, Nils Hakansson, D. Hanna, J. Holder, G. Hughes, C. A. Johnson, P. Kaaret, P. Kar, M. Kertzman, Y. Khassen, D. Kieda, H. Krawczynski, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, D. Nieto, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, Manuela Pohl, A. Popkow, H. Prokoph, Elisa Pueschel, J. Quinn, K. Ragan, J. Rajotte, L. C. Reyes, P. T. Reynolds, G. T. Richards, E. Roache, G. H. Sembroski, K. Shahinyan, A. W. Smith, D. Staszak, Igor O. Telezhinsky, J. V. Tucci, J. Tyler, A. Varlotta, S. Vincent, S. P. Wakely, A. Weinstein, R. Welsing, Alina Wilhelm, D. A. Williams, A. Zajczyk, B. Zitzer
- The Galactic center is an interesting region for high-energy (0.1-100 GeV) and very-high-energy (E > 100 GeV) gamma-ray observations. Potential sources of GeV/TeV gamma-ray emission have been suggested, e.g., the accretion of matter onto the supermassive black hole, cosmic rays from a nearby supernova remnant (e.g., Sgr A East), particle acceleration in a plerion, or the annihilation of dark matter particles. The Galactic center has been detected by EGRET and by Fermi/LAT in the MeV/GeV energy band. At TeV energies, the Galactic center was detected with moderate significance by the CANGAROO and Whipple 10 m telescopes and with high significance by H.E.S.S., MAGIC, and VERITAS. We present the results from three years of VERITAS observations conducted at large zenith angles resulting in a detection of the Galactic center on the level of 18 standard deviations at energies above similar to 2.5 TeV. The energy spectrum is derived and is found to be compatible with hadronic, leptonic, and hybrid emission models discussed in the literature.The Galactic center is an interesting region for high-energy (0.1-100 GeV) and very-high-energy (E > 100 GeV) gamma-ray observations. Potential sources of GeV/TeV gamma-ray emission have been suggested, e.g., the accretion of matter onto the supermassive black hole, cosmic rays from a nearby supernova remnant (e.g., Sgr A East), particle acceleration in a plerion, or the annihilation of dark matter particles. The Galactic center has been detected by EGRET and by Fermi/LAT in the MeV/GeV energy band. At TeV energies, the Galactic center was detected with moderate significance by the CANGAROO and Whipple 10 m telescopes and with high significance by H.E.S.S., MAGIC, and VERITAS. We present the results from three years of VERITAS observations conducted at large zenith angles resulting in a detection of the Galactic center on the level of 18 standard deviations at energies above similar to 2.5 TeV. The energy spectrum is derived and is found to be compatible with hadronic, leptonic, and hybrid emission models discussed in the literature. Future, more detailed measurements of the high-energy cutoff and better constraints on the high-energy flux variability will help to refine and/or disentangle the individual models.…
MetadatenAuthor details: | A. Archer, Anna Barnacka, M. Beilicke, W. Benbow, K. Berger, R. Bird, Jonathan Biteau, J. H. Buckley, V. Bugaev, K. Byrum, J. V. Cardenzana, M. Cerruti, W. Chen, Xiaoming Chen, L. Ciupik, M. P. Connolly, W. Cui, H. J. Dickinson, J. Dumm, J. D. Eisch, A. Falcone, Simone FedericiGND, Q. Feng, J. P. Finley, H. Fleischhack, L. Fortson, A. Furniss, N. Galante, S. Griffin, S. T. Griffiths, J. Grube, G. Gyuk, Nils Hakansson, D. Hanna, J. Holder, G. Hughes, C. A. Johnson, P. Kaaret, P. Kar, M. Kertzman, Y. Khassen, D. Kieda, H. Krawczynski, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, D. Nieto, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, Manuela Pohl, A. Popkow, H. Prokoph, Elisa PueschelORCiD, J. Quinn, K. Ragan, J. Rajotte, L. C. Reyes, P. T. Reynolds, G. T. Richards, E. Roache, G. H. Sembroski, K. Shahinyan, A. W. Smith, D. Staszak, Igor O. TelezhinskyORCiD, J. V. Tucci, J. Tyler, A. Varlotta, S. Vincent, S. P. Wakely, A. Weinstein, R. Welsing, Alina WilhelmORCiDGND, D. A. Williams, A. Zajczyk, B. Zitzer |
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DOI: | https://doi.org/10.1088/0004-637X/790/2/149 |
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ISSN: | 0004-637X |
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ISSN: | 1538-4357 |
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Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
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Publisher: | IOP Publ. Ltd. |
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Place of publishing: | Bristol |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2014 |
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Publication year: | 2014 |
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Release date: | 2017/03/27 |
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Tag: | Galaxy: center; astroparticle physics; black hole physics; gamma rays: galaxies; methods: data analysis; radiation mechanisms: non-thermal |
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Volume: | 790 |
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Issue: | 2 |
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Number of pages: | 9 |
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Funding institution: | U.S. Department of Energy Office of Science; U.S. National Science
Foundation; Smithsonian Institution; NSERC in Canada; Science Foundation
Ireland [SFI 10/RFP/AST2748]; STFC in the UK |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer review: | Referiert |
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