Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-20
Astronomy and Astrophysics
Astrophysics
4 pages, 6 figures, Submitted to the 29th International Cosmic Ray Conference, Pune, India
Scientific paper
We fit the HiRes ultra-high energy cosmic ray (UHECR) spectrum measurements with broken power laws in order to identify features. These fits find the previously observed feature known as the Ankle at 10**18.5 eV, as well as evidence for a suppression at higher energies, above 10**19.8 eV. We use the integral spectrum and the E_1/2 test to identify this high energy suppression with the GZK suppression. Finally, we use a model of uniformly distributed extragalactic proton sources together with a phenomenological model of the galactic cosmic ray spectrum to compare the HiRes spectra to what should be expected from the GZK suppression, and to measure how the extragalactic sources must evolve and what the input spectral slope must be to fit the HiRes data. Fits using updated spectra will be presented in Pune.
Bergman Douglas R.
for the HiRes Collaboration
No associations
LandOfFree
Fitting the HiRes Spectra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fitting the HiRes Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fitting the HiRes Spectra will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-490927