The high-energy spectrum of Cygnus X-1 revisited

1993 ◽  
Vol 411 ◽  
pp. L95 ◽  
Author(s):  
F. Haardt ◽  
C. Done ◽  
G. Matt ◽  
A. C. Fabian
Keyword(s):  

2003 ◽  
Vol 66 (7) ◽  
pp. 1145-1206 ◽  
Author(s):  
Andreas Haungs ◽  
Heinigerd Rebel ◽  
Markus Roth


2012 ◽  
Vol 18 ◽  
pp. 221-229
Author(s):  
◽  
J. R. T. DE MELLO NETO

We present the status and the recent measurements from the Pierre Auger Observatory. The energy spectrum is described and its features discussed. We report searches for anisotropy of cosmic rays arrival directions in large scales and through correlation with catalogues of celestial objects. The measurement of the cross section proton-air is discussed. Finally, the mass composition is addressed with the measurements of the variation of the depth of shower maximum with energy and with the muon density at ground.



2007 ◽  
Vol 204 (2) ◽  
pp. 508-512 ◽  
Author(s):  
D. G. Austing ◽  
G. Yu ◽  
C. Payette ◽  
J. A. Gupta ◽  
M. Korkusinski ◽  
...  


2010 ◽  
Vol 22 (3) ◽  
pp. 655-658 ◽  
Author(s):  
陈楠 Chen Nan ◽  
戴文华 Dai Wenhua ◽  
王敏鸿 Wang Minhong ◽  
周智 Zhou Zhi ◽  
王利鸣 Wang Liming ◽  
...  


1993 ◽  
Author(s):  
J. Bellandi ◽  
C. G. S. Costa ◽  
R. J. M. Covolan ◽  
C. Dobrigkeit ◽  
M. M. Guzzo ◽  
...  




Universe ◽  
2018 ◽  
Vol 4 (11) ◽  
pp. 128 ◽  
Author(s):  
Dariusz Góra ◽  

The Pierre Auger Observatory is the world’s largest operating detection system for the observation of ultra high energy cosmic rays (UHECRs), with energies above 10 17 eV. The detector allows detailed measurements of the energy spectrum, mass composition and arrival directions of primary cosmic rays in the energy range above 10 17 eV. The data collected at the Auger Observatory over the last decade show the suppression of the cosmic ray flux at energies above 4 × 10 19 eV. However, it is still unclear if this suppression is caused by the energy limitation of their sources or by the Greisen–Zatsepin–Kuzmin (GZK) cut-off. In such a case, UHECRs would interact with the microwave background (CMB), so that particles traveling long intergalactic distances could not have energies greater than 5 × 10 19 eV. The other puzzle is the origin of UHECRs. Some clues can be drawn from studying the distribution of their arrival directions. The recently observed dipole anisotropy has an orientation that indicates an extragalactic origin of UHECRs. The Auger surface detector array is also sensitive to showers due to ultra high energy neutrinos of all flavors and photons, and recent neutrino and photon limits provided by the Auger Observatory can constrain models of the cosmogenic neutrino production and exotic scenarios of the UHECRs origin, such as the decays of super heavy, non-standard-model particles. In this paper, the recent results on measurements of the energy spectrum, mass composition and arrival directions of cosmic rays, as well as future prospects are presented.



1994 ◽  
Author(s):  
M. Kunz ◽  
R. Staubert ◽  
D. E. Gruber ◽  
W. Pietsch ◽  
J. Trümper ◽  
...  


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