Monocular UHECR spectra as measured by HiRes

Monocular UHECR Spectra as Measured by HiRes

We have measured the spectrum of UHE cosmic rays in monocular mode using separately both detectors the High Resolution Fly’s Eye experiment. We describe the two detectors and the basic methods of analysis, and we present our measured spectra. We compare these spectra with that produced by an astrophysical source model with galactic and uniformly distributed extra-galactic sources. We also compa...

Fitting the HiRes Spectra and Monocular Composition

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 γ = −2.38± 0.04 with a distribution of sources varying with a evolution parameter m = 2.8 ± 0.3. In the second section, we discuss preliminary results from a new composition measurement using HiRes...

Quality Assessment of KOA HIRES Extracted Spectra

A Measurement of the UHECR Spectrum with the HiRes FADC Detector

We have measured the energy spectrum of ultra-high energy cosmic rays (UHECR) with the HiRes FADC detector (HiRes-2) in monocular mode. A detailed Monte Carlo simulation of the detector response to air showers has been used to calculate the energy dependent acceptance of the air fluorescence detector. The measured spectrum complements the measurement by the HiRes-1 detector down to lower energi...

Studies of Systematic Uncertainties in the HiRes - II Measurement of the UHECR Spectrum

Presenter: A. Zech ([email protected]), fra-zech-A-abs1-he14-poster We present studies of systematic uncertainties in the measurement of the ultra-high energy cosmic ray (UHECR) spectrum with the FADC detector of the High Resolution Fly's Eye experiment (HiRes-II). One source of uncertainties lies in the simulation of the energy dependent aperture of the air fluorescence detector. We study...