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Volumn 320, Issue 5884, 2008, Pages 1752-1754

Very-high-energy gamma rays from a distant quasar: How transparent is the universe?

(149)  Albert, J a   Aliu, E a   Anderhub, H c   Antonelli, L A d   Antoranz, P e   Backes, M f   Baixeras, C g   Barrio, J A e   Bartko, H h   Bastieri, D i   Becker, J K f   Bednarek, W j   Berger, K a   Bernardini, E k   Bigongiari, C i   Biland, A c   Bock, R K h,i   Bonnoli, G l   Bordas, P m   Bosch Ramon, V m   more..


Author keywords

[No Author keywords available]

Indexed keywords

ENERGY; GAMMA RAY SPECTROMETRY; LIGHT; OBSERVATIONAL METHOD; RADIATION BALANCE;

EID: 46449098817     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1157087     Document Type: Article
Times cited : (556)

References (21)
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    • Further information on data and methods and additional discussion are available on Science Online.
    • Further information on data and methods and additional discussion are available on Science Online.
  • 8
    • 63849256375 scopus 로고    scopus 로고
    • High Energy Gamma-Ray Astronomy
    • F. Aharonian, H. Voelk, D. Horns, Eds, American Institute of Physics, Heidelberg
    • 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.
    • (2005) American Institute of Physics Conference Series , vol.745 , pp. 23
    • Primack, J.R.1    Bullock, J.S.2    Somerville, R.S.3
  • 12
    • 46449136505 scopus 로고    scopus 로고
    • -α*, where α* is the intrinsic photon spectral index.
    • -α*, where α* is the intrinsic photon spectral index.
  • 15
    • 33646197412 scopus 로고    scopus 로고
    • F. Aharonian et al., Nature 440, 1018 (2006).
    • (2006) Nature , vol.440 , pp. 1018
    • Aharonian, F.1
  • 16
    • 46449105653 scopus 로고    scopus 로고
    • According to recent simulations (20), photon indices of <1.5 cannot be entirely excluded.
    • According to recent simulations (20), photon indices of <1.5 cannot be entirely excluded.
  • 21
    • 46449124671 scopus 로고    scopus 로고
    • 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
    • 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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