Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-21
JCAP 0712:002,2007
Astronomy and Astrophysics
Astrophysics
19 pages, 6 figures (33 panels)- Uses iopart.cls and iopart12.clo- In version 2: addition of a few sentences and two reference
Scientific paper
10.1088/1475-7516/2007/12/002
We fit the recently published Pierre Auger ultra-high energy cosmic ray spectrum assuming that either nucleons or nuclei are emitted at the sources. We consider the simplified cases of pure proton, or pure oxygen, or pure iron injection. We perform an exhaustive scan in the source evolution factor, the spectral index, the maximum energy of the source spectrum Z E_{max}, and the minimum distance to the sources. We show that the Pierre Auger spectrum agrees with any of the source compositions we assumed. For iron, in particular, there are two distinct solutions with high and low E_{max} (e.g. 6.4 10^{20} eV and 2 10^{19} eV) respectively which could be distinguished by either a large fraction or the near absence of proton primaries at the highest energies. We raise the possibility that an iron dominated injected flux may be in line with the latest composition measurement from the Pierre Auger Observatory where a hint of heavy element dominance is seen.
Arisaka Katsushi
Gelmini Graciela B.
Healy Matthew
Kalashev Oleg
Lee Joong
No associations
LandOfFree
Composition of UHECR and the Pierre Auger Observatory Spectrum 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 Composition of UHECR and the Pierre Auger Observatory Spectrum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composition of UHECR and the Pierre Auger Observatory Spectrum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-256619