Very-high-energy gamma rays from a distant quasar: How transparent is the universe?
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Albert, J
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46449108120
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Further information on data and methods and additional discussion are available on Science Online.
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Further information on data and methods and additional discussion are available on Science Online.
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8
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63849256375
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High Energy Gamma-Ray Astronomy
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F. Aharonian, H. Voelk, D. Horns, Eds, American Institute of Physics, Heidelberg
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J. R. Primack, J. S. Bullock, R. S. Somerville, in High Energy Gamma-Ray Astronomy, American Institute of Physics Conference Series, F. Aharonian, H. Voelk, D. Horns, Eds. (American Institute of Physics, Heidelberg, 2005), vol. 745, p. 23.
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American Institute of Physics Conference Series
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Primack, J.R.1
Bullock, J.S.2
Somerville, R.S.3
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46449136505
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-α*, where α* is the intrinsic photon spectral index.
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-α*, where α* is the intrinsic photon spectral index.
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15
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33646197412
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F. Aharonian et al., Nature 440, 1018 (2006).
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(2006)
Nature
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Aharonian, F.1
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46449105653
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According to recent simulations (20), photon indices of <1.5 cannot be entirely excluded.
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According to recent simulations (20), photon indices of <1.5 cannot be entirely excluded.
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21
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46449124671
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We thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma, Canary Islands. The support of the German Bundesministerium für Bildung und Forschung and Max-Planck Gesellschaft, the Italian Istituto Nazionale di Fisica Nucleare (INFN, and the Spanish Centro de Investigaciòn Cientifica y Technologica is gratefully acknowledged. This work was also supported by ETH (research grant TH 34/043) and the Polish MNil grant 1P03D01028
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We thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma, Canary Islands. The support of the German Bundesministerium für Bildung und Forschung and Max-Planck Gesellschaft, the Italian Istituto Nazionale di Fisica Nucleare (INFN), and the Spanish Centro de Investigaciòn Cientifica y Technologica is gratefully acknowledged. This work was also supported by ETH (research grant TH 34/043) and the Polish MNil (grant 1P03D01028).
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