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Arqueros Martínez, Fernando and Blanco Ramos, Francisco and García Pinto, Diego and Minaya Flores, Ignacio Andrés and Ortiz Ramis, Monserrat and Rosado Vélez, Jaime and Vázquez Peñas, José Ramón (2014) A search for point sources of EeV photons. Astrophysical journal, 789 (2). ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1088/0004-637X/789/2/160
Abstract
Measurements of air showers made using the hybrid technique developed with the fluorescence and surface detectors of the Pierre Auger Observatory allow a sensitive search for point sources of EeV photons anywhere in the exposed sky. A multivariate analysis reduces the background of hadronic cosmic rays. The search is sensitive to a declination band from -85 degrees to +20 degrees, in an energy range from 10(17.3) eV to 10(18.5) eV. No photon point source has been detected. An upper limit on the photon flux has been derived for every direction. The mean value of the energy flux limit that results from this, assuming a photon spectral index of -2, is 0.06 eV cm(-2) s(-1), and no celestial direction exceeds 0.25 eV cm(-2) s(-1). These upper limits constrain scenarios in which EeV cosmic ray protons are emitted by non-transient sources in the Galaxy.
Item Type: | Article |
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Additional Information: | ©2014. The American Astronomical Society. All rights reserved. |
Uncontrolled Keywords: | Energy cosmic-rays; Gamma-rays; Galactic-center; Astronomy; Framework; Spectrum |
Subjects: | Sciences > Physics > Nuclear physics |
ID Code: | 31449 |
Deposited On: | 21 Jul 2015 08:42 |
Last Modified: | 10 Dec 2018 14:57 |
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