Fitting the HiRes Spectra and Monocular Composition

Abstract

This paper consists of two sections. In the first section, we discuss our fits to the latest HiRes monocular spectra. We find that the best fit for the extragalactic component has a spectral index of $\gamma =-2.38\pm 0.04$ with a distribution of sources varying with a evolution parameter $m=2.8\pm 0.3$. In the second section, we discuss preliminary results from a new composition measurement using HiRes monocular data. We find a predominantly light spectrum above $10^{17.6}$ eV.

6 pages, 8 figures; to appear in the proceedings of CRIS 2004, Catania, Italy, 31 May - 4 June 2004

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