A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources

Details A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources

2008-09-23

arxiv.org/abs/0809.4003v2

Astrophys.J.702:825-832,2009

Astronomy and Astrophysics

Astrophysics

9 pages, 4 figures, 2 tables; v2: added discussions on the role of the energy cut and the chemical composition; to appear in A

Scientific paper

10.1088/0004-637X/702/2/825

We perform an autocorrelation study of the Auger data with the aim to constrain the number density n_s of ultrahigh energy cosmic ray (UHECR) sources, estimating at the same time the effect on $n_s$ of the systematic energy scale uncertainty and of the distribution of UHECR. The use of global analysis has the advantage that no biases are introduced, either in n_s or in the related error bar, by the a priori choice of a single angular scale. The case of continuous, uniformly distributed sources is nominally disfavored at 99% C.L. and the fit improves if the sources follow the large-scale structure of matter in the universe. The best fit values obtained for the number density of proton sources are within a factor ~2 around n_s ~ 10^{-4}/Mpc^3 and depend mainly on the Auger energy calibration scale, with lower densities being preferred if the current scale is correct. The data show no significant small-scale clustering on scales smaller than a few degrees. This might be interpreted as a signature of magnetic smearing of comparable size, comparable with the indication of a ~3 degrees magnetic deflection coming from cross-correlation results. The effects on the above results of some approximations done is also discussed.

Affiliated with

Also associated with

No associations

Rating

A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources 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 A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-109957