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1. Search for correlations between HiRes stereo events and active galactic nuclei

Author

R. C. Gray, B. T. Stokes, C. Song, B. C. Knapp, J. R. Thomas, John N. Matthews, J. H. Boyer, Segev BenZvi, L. M. Scott, A. O’Neill, R. Riehle, C. Cannon, O. A. Brusova, Pierre Sokolsky, Dale Tupa, G. Archbold, P. Hüntemeyer, Konstantin Belov, W. Deng, Douglas Bergman, N. Sasaki, C. B. Finley, M. M. Maestas, M. A. Kirn, S. A. Blake, Gordon Thomson, M. D. Roberts, R. W. Springer, E. J. Mannel, C. C. H. Jui, Steve Schnetzer, E. C. Loh, G. Sinnis, Gareth Hughes, S. B. Thomas, C. M. Hoffman, Michael H. Holzscheiter, Tareq Abu-Zayyad, B. F. Jones, M. Seman, Y. Fedorova, J. D. Smith, Kevin Reil, N. Manago, J. F. Amman, J. Findlay, D. Rodriguez, Z. Cao, Lawrence Wiencke, Dmitri Ivanov, R. Snow, John Belz, S. A. Moore, L. Perera, Xiang Zhang, L. J. Marek, K. Kim, M. Allen, William Hanlon, Rasha Abbasi, C. A. Painter, K. Martens, A. Zech, G. W. Burt, and S. R. Stratton

Subjects
Physics, Active galactic nucleus, 010308 nuclear & particles physics, Astrophysics (astro-ph), Northern Hemisphere, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Positive correlation, 01 natural sciences, Auger, Data set, Correlation, 0103 physical sciences, 010303 astronomy & astrophysics, Southern Hemisphere
Abstract

We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays observed by the High Resolution Fly's Eye experiment and Active Galactic Nuclei (AGN) visible from its northern hemisphere location. No correlations, other than random correlations, have been found. We report our results using search parameters prescribed by the Pierre Auger collaboration. Using these parameters, the Auger collaboration concludes that a positive correlation exists for sources visible to their southern hemisphere location. We also describe results using two methods for determining the chance probability of correlations: one in which a hypothesis is formed from scanning one half of the data and tested on the second half, and another which involves a scan over the entire data set. The most significant correlation found occurred with a chance probability of 24%., 13 pages, 1 table, 5 figures

Published
2008

2. Search for point-like sources of cosmic rays with energies above 1018.5eV in the HiRes-I monocular data set

Author

B.M. Connolly, William Hanlon, Rasha Abbasi, L. Perera, S. A. Blake, M. D. Roberts, W. Deng, C. M. Hoffman, G. Sinnis, Y. Fedorova, Dale Tupa, C. B. Finley, John N. Matthews, Gareth Hughes, J. D. Smith, Tareq Abu-Zayyad, B. F. Jones, R. Riehle, R. W. Springer, Kevin Reil, R. C. Gray, C. A. Painter, B. T. Stokes, J. R. Thomas, L. M. Scott, K. Martens, M. A. Kirn, E. C. Loh, Pierre Sokolsky, A. Zech, M. M. Maestas, N. Manago, Z. Cao, S. A. Moore, G. Archbold, J. A.J. Matthews, Douglas Bergman, Segev BenZvi, Lawrence Wiencke, C. C. H. Jui, Konstantin Belov, J. Findlay, Xiang Zhang, John Belz, Steve Schnetzer, M. Sasaki, S. B. Thomas, C. Song, L. J. Marek, P. Hüntemeyer, A. O’Neill, D. Rodriguez, James F. Amann, S. Westerhoff, K. Kim, Gordon Thomson, and Michael H. Holzscheiter

Subjects
Physics, Monocular, Point source, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Northern Hemisphere, Astronomy, Flux, Astronomy and Astrophysics, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Physics::Geophysics, Sky, 0103 physical sciences, Ultra-high-energy cosmic ray, 010306 general physics, Anisotropy, 010303 astronomy & astrophysics, media_common
Abstract

We report the results of a search for point-like deviations from isotropy in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere. In the monocular data set collected by the High-Resolution Fly's Eye, consisting of 1,525 events with energy exceeding 10^18.5 eV, we find no evidence for point-like excesses. We place 90% c.l. upper limits less than or equal to 0.8 cosmic rays/km^2yr on the flux from such sources as a function of position in the sky., Comment: 24 pages, 16 figures

Published
2007

3. Studies of systematic uncertainties in the estimation of the monocular aperture of the HiRes experiment

Author

B. F. Jones, A. O’Neill, K. Martens, John Belz, G. W. Burt, O. A. Brusova, A. Zech, Pierre Sokolsky, P. Hüntemeyer, L. M. Scott, C. B. Finley, L. J. Marek, Dale Tupa, William Hanlon, Rasha Abbasi, C. C. H. Jui, John N. Matthews, E. C. Loh, John Matthews, S. B. Thomas, B. T. Stokes, J. R. Thomas, R. W. Springer, Konstantin Belov, B. C. Connolly, G. Archbold, Lawrence Wiencke, N. Manago, W. Deng, Douglas Bergman, C. Song, S. Y. Ben Zvi, Steve Schnetzer, L. Perera, J. D. Smith, S. A. Blake, M. Sasaki, Xiang Zhang, M. D. Roberts, Kevin Reil, Gareth Hughes, J. F. Amman, M. M. Maestas, R. Riehle, Tareq Abu-Zayyad, Z. Cao, C. A. Painter, C. M. Hoffman, D. Rodriguez, G. Sinnis, S. A. Moore, S. Westerhoff, Y. Fedorova, K. Kim, M. A. Kirn, R. C. Gray, Gordon Thomson, and Michael H. Holzscheiter

Subjects
Physics, Monocular, business.industry, Aperture, Astrophysics (astro-ph), Monte Carlo method, Detector, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Interaction model, Astrophysics, 01 natural sciences, Power law, 3. Good health, Computational physics, Air shower, Optics, 0103 physical sciences, 010306 general physics, business, 010303 astronomy & astrophysics
Abstract

We have studied several sources of systematic uncertainty in calculating the aperture of the High Resolution Fly's Eye experiment (HiRes) in monocular mode, primarily as they affect the HiRes-II site. The energy dependent aperture is determined with detailed Monte Carlo simulations of the air showers and the detector response. We have studied the effects of changes to the input energy spectrum and composition used in the simulation. A realistic shape of the input spectrum is used in our analysis in order to avoid biases in the aperture estimate due to the limited detector resolution. We have examined the effect of exchanging our input spectrum with a simple E^{-3} power law in the "ankle" region. Uncertainties in the input composition are shown to be significant for energies below about 10^{18} eV for data from the HiRes-II detector. Another source of uncertainties is the choice of the hadronic interaction model in the air shower generator. We compare the aperture estimate for two different models: QGSJet01 and SIBYLL 2.1. We also describe the implications of employing an atmospheric database with hourly measurements of the aerosol component, instead of using an average as has been used in our previously published measurements of the monocular spectra., Comment: 27 pages, 15 figures, revision

Published
2007

4. Search for Cross‐Correlations of Ultrahigh‐Energy Cosmic Rays with BL Lacertae Objects

Author

S. A. Blake, J. D. Smith, Kevin Reil, D. Rodriguez, M. D. Roberts, R. Snow, C. M. Hoffman, G. Sinnis, Y. Fedorova, S. Westerhoff, K. Kim, E. J. Mannel, John N. Matthews, B.M. Connolly, Konstantin Belov, G. Archbold, N. Manago, W. Deng, Lawrence Wiencke, P. Hüntemeyer, Segev BenZvi, Dale Tupa, C. B. Finley, M. Seman, J. A.J. Matthews, R. W. Springer, K. Martens, Gareth Hughes, A. Zech, Tareq Abu-Zayyad, M. Sasaki, Steve Schnetzer, M. M. Maestas, G. W. Burt, B. C. Knapp, Gordon Thomson, James F. Amann, J. Findlay, Douglas Bergman, John Belz, Pierre Sokolsky, L. J. Marek, C. C. H. Jui, R. Riehle, Michael H. Holzscheiter, S. B. Thomas, William Hanlon, Rasha Abbasi, A. O’Neill, B. T. Stokes, J. R. Thomas, Z. Cao, J. H. Boyer, M. A. Kirn, C. A. Painter, E. C. Loh, and L. Perera

Subjects
Physics, Active galactic nucleus, genetic structures, 010308 nuclear & particles physics, High resolution, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 01 natural sciences, Galaxy, Correlation, Space and Planetary Science, 0103 physical sciences, Ultrahigh energy, 010303 astronomy & astrophysics, health care economics and organizations
Abstract

Data taken in stereo mode by the High Resolution Fly's Eye (HiRes) air fluorescence experiment are analyzed to search for correlations between the arrival directions of ultra--high-energy cosmic rays with the positions of BL Lacertae objects. Several previous claims of significant correlations between BL Lacs and cosmic rays observed by other experiments are tested. These claims are not supported by the HiRes data. However, we verify a recent analysis of correlations between HiRes events and a subset of confirmed BL Lacs from the 10th Veron Catalog, and we study this correlation in detail. Due to the a posteriori nature of the search, the significance level cannot be reliably estimated and the correlation must be tested independently before any claim can be made. We identify the precise hypotheses that will be tested with statistically independent data., Comment: 5 pages, 1 figure, submitted to ApJ

Published
2006

5. Observation of the ankle and evidence for a high-energy break in the cosmic ray spectrum

Author

S. Y. Ben Zvi, Gordon Thomson, J. A.J. Matthews, J. Findlay, John Belz, Steve Schnetzer, B. C. Connolly, L. J. Marek, Michael H. Holzscheiter, C. Song, J. R. Thomas, John N. Matthews, P. Hüntemeyer, M. A. Kirn, C. B. Finley, Lawrence Wiencke, K. M. Simpson, Kevin Reil, William Hanlon, Rasha Abbasi, R. Riehle, B. T. Stokes, W. Deng, N. Manago, Bruce R. Dawson, M. Sasaki, M. D. Roberts, C. M. Hoffman, G. Sinnis, Jose A. Bellido, G. Archbold, Douglas Bergman, C. A. Painter, Z. Cao, A. O’Neill, Konstantin Belov, R. W. Atkins, E.G. Loh, Dale Tupa, R. W. Springer, C. C. H. Jui, G. W. Burt, S. B. Thomas, J. D. Smith, J. F. Amman, R. Snow, L. Perera, S. Westerhoff, K. Kim, Pierre Sokolsky, K. Martens, A. Zech, Gareth Hughes, Tareq Abu-Zayyad, Y. Fedorova, Roger W Clay, and M. M. Maestas

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Spectrum (functional analysis), Detector, High resolution, Cosmic ray, Astrophysics, 01 natural sciences, medicine.anatomical_structure, Computer Science::Systems and Control, 0103 physical sciences, Calibration, medicine, Ankle, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract

We have measured the cosmic ray spectrum at energies above $10^{17}$ eV using the two air fluorescence detectors of the High Resolution Fly's Eye experiment operating in monocular mode. We describe the detector, PMT and atmospheric calibrations, and the analysis techniques for the two detectors. We fit the spectrum to models describing galactic and extragalactic sources. Our measured spectrum gives an observation of a feature known as the ``ankle'' near $3\times 10^{18}$ eV, and strong evidence for a suppression near $6\times 10^{19}$ eV., Comment: 14 pages, 9 figures. To appear in Physics Letters B. Accepted version

Published
2005

6. Search for Point Sources of Ultra–High‐Energy Cosmic Rays above 4.0 x 1019eV Using a Maximum Likelihood Ratio Test

Author

R. U. Abbasi, T. Abu‐Zayyad, J. F. Amann, G. Archbold, R. Atkins, J. A. Bellido, K. Belov, J. W. Belz, S. Y. Ben‐Zvi, D. R. Bergman, J. H. Boyer, G. W. Burt, Z. Cao, R. W. Clay, B. M. Connolly, B. R. Dawson, W. Deng, G. R. Farrar, Y. Fedorova, J. Findlay, C. B. Finley, W. F. Hanlon, C. M. Hoffman, M. H. Holzscheiter, G. A. Hughes, P. Huntemeyer, C. C. H. Jui, K. Kim, M. A. Kirn, B. C. Knapp, E. C. Loh, M. M. Maestas, N. Manago, E. J. Mannel, L. J. Marek, K. Martens, J. A. J. Matthews, J. N. Matthews, A. O’Neill, C. A. Painter, L. Perera, K. Reil, R. Riehle, M. D. Roberts, M. Sasaki, S. R. Schnetzer, M. Seman, K. M. Simpson, G. Sinnis, J. D. Smith, R. Snow, P. Sokolsky, C. Song, R. W. Springer, B. T. Stokes, J. R. Thomas, S. B. Thomas, G. B. Thomson, D. Tupa, S. Westerhoff, L. R. Wiencke, and A. Zech

Subjects
Physics, 010308 nuclear & particles physics, Point source, Astrophysics::High Energy Astrophysical Phenomena, Ratio test, Astronomy and Astrophysics, Probability density function, Cosmic ray, Astrophysics, 01 natural sciences, Bin, Space and Planetary Science, 0103 physical sciences, Ultra-high-energy cosmic ray, Cluster analysis, 010303 astronomy & astrophysics, Event (probability theory)
Abstract

We present the results of a search for cosmic ray point sources at energies above 40 EeV in the combined data sets recorded by the AGASA and HiRes stereo experiments. The analysis is based on a maximum likelihood ratio test using the probability density function for each event rather than requiring an a priori choice of a fixed angular bin size. No statistically significant clustering of events consistent with a point source is found.

Published
2005

7. A search for arrival direction clustering in the HiRes-I monocular data above 1019.5 eV

Author

B.M. Connolly, A. O’Neill, L. Perera, Z. Cao, N. Manago, R. W. Springer, Gordon Thomson, G. Archbold, J. Findlay, John N. Matthews, John Belz, P. Hüntemeyer, G. W. Burt, Michael H. Holzscheiter, R. Snow, K. Martens, J. R. Thomas, Douglas Bergman, B. T. Stokes, A. Zech, S. Westerhoff, W. Deng, K. Kim, Bruce R. Dawson, Dale Tupa, M. D. Roberts, C. B. Finley, C. M. Hoffman, R. W. Atkins, M. A. Kirn, G. Sinnis, Y. Fedorova, Jose A. Bellido, Gareth Hughes, Tareq Abu-Zayyad, L. J. Marek, Pierre Sokolsky, Lawrence Wiencke, M. Sasaki, E. C. Loh, C. C. H. Jui, S. B. Thomas, James F. Amann, Segev BenZvi, R. Riehle, J. D. Smith, C. A. Painter, William Hanlon, Rasha Abbasi, J. A.J. Matthews, C. Song, Kevin Reil, K. M. Simpson, Konstantin Belov, M. M. Maestas, Steve Schnetzer, and Roger W Clay

Subjects
Physics, Monocular, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Autocorrelation, Detector, Astronomy and Astrophysics, Cosmic ray, Akeno Giant Air Shower Array, Astrophysics, 01 natural sciences, Data set, 0103 physical sciences, Angular resolution, Cluster analysis, 010303 astronomy & astrophysics
Abstract

In the past few years, small scale anisotropy has become a primary focus in the search for source of Ultra-High Energy Cosmic Rays (UHECRs). The Akeno Giant Air Shower Array (AGASA) has reported the presence of clusters of event arrival directions in their highest energy data set. The High Resolution Fly's Eye (HiRes) has accumulated an exposure in one of its monocular eyes at energies above 10^(19.5) eV comparable to that of AGASA. However, monocular events observed with an air fluorescence detector are characterized by highly asymmetric angular resolution. A method is developed for measuring autocorrelation with asymmetric angular resolution. It is concluded that HiRes-I observations are consistent with no autocorrelation and that the sensitivity to clustering of the HiRes-I detector is comparable to that of the reported AGASA data set. Furthermore, we state with a 90% confidence level that no more than 13% of the observed HiRes-I events above 10^(19.5) eV could be sharing common arrival directions. However, because a measure of autocorrelation makes no assumption of the underlying astrophysical mechanism that results in clustering phenomena, we cannot claim that the HiRes monocular analysis and the AGASA analysis are inconsistent beyond a specified confidence level., Comment: 16 pages, 23 figures

Published
2004

8. Study of Small-Scale Anisotropy of Ultra-High-Energy Cosmic Rays Observed in Stereo by the High Resolution Fly's Eye Detector

Author

Douglas Bergman, J. A.J. Matthews, J. D. Smith, R. Snow, M. A. Kirn, C. Song, Kevin Reil, B. C. Knapp, R. W. Springer, Jose A. Bellido, W. Deng, S. Westerhoff, Gordon Thomson, L. J. Marek, G. Archbold, K. Kim, M. M. Maestas, M. Seman, R. Riehle, C. A. Painter, Michael H. Holzscheiter, Dale Tupa, C. C. H. Jui, Lawrence Wiencke, John N. Matthews, Pierre Sokolsky, R. W. Atkins, James F. Amann, S. B. Thomas, M. Sasaki, Segev BenZvi, M. D. Roberts, Z. Cao, Roger W Clay, E. J. Mannel, C. M. Hoffman, G. Sinnis, E. C. Loh, William Hanlon, Y. Fedorova, Rasha Abbasi, Konstantin Belov, A. O’Neill, K. M. Simpson, C. B. Finley, Steve Schnetzer, L. Perera, N. Manago, J. Findlay, John Belz, B. T. Stokes, J. H. Boyer, Bruce R. Dawson, J. R. Thomas, Gareth Hughes, Tareq Abu-Zayyad, G. W. Burt, B.M. Connolly, P. Hüntemeyer, K. Martens, and A. Zech

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 01 natural sciences, Cosmology, Particle acceleration, Correlation function (statistical mechanics), Space and Planetary Science, 0103 physical sciences, Angular resolution, Ultra-high-energy cosmic ray, Anisotropy, 010303 astronomy & astrophysics
Abstract

The High Resolution Fly's Eye (HiRes) experiment is an air fluorescence detector which, operating in stereo mode, has a typical angular resolution of 06 and is sensitive to cosmic rays with energies above 1018 eV. The HiRes cosmic-ray detector is thus an excellent instrument for the study of the arrival directions of ultra-high-energy cosmic rays. We present the results of a search for anisotropies in the distribution of arrival directions on small scales ( 1019 eV). The search is based on data recorded between 1999 December and 2004 January, with a total of 271 events above 1019 eV. No small-scale anisotropy is found, and the strongest clustering found in the HiRes stereo data is consistent at the 52% level with the null hypothesis of isotropically distributed arrival directions.

Published
2004

9. Analysis of large-scale anisotropy of ultra-high energy cosmic rays in HiRes data

Author

B. F. Jones, James F. Amann, Dale Tupa, P. Tinyakov, Kevin Reil, Konstantin Belov, R. Riehle, C. Cannon, J. Findlay, John Belz, William Hanlon, K. Kim, O. A. Brusova, P. Hüntemeyer, Hylke B. J. Koers, R. W. Springer, K. Martens, Lawrence Wiencke, M. Sasaki, M. M. Maestas, Steve Schnetzer, Gordon Thomson, Michael H. Holzscheiter, Dmitri Ivanov, L. J. Marek, G. W. Burt, Rasha Abbasi, J. D. Smith, Gareth Hughes, Tareq Abu-Zayyad, C. B. Finley, A. Zech, Douglas Bergman, Ben Stokes, L. M. Scott, R. C. Gray, N. Manago, Pierre Sokolsky, Xiang Zhang, D. C. Rodriguez, C. Song, Gus Sinnis, L. Perera, M. Allen, G. Archbold, S. R. Stratton, A. O’Neill, J. R. Thomas, M. D. Roberts, C. M. Hoffman, Y. Fedorova, W. Deng, John N. Matthews, C. A. Painter, Z. Cao, S. A. Moore, C. C. H. Jui, S. B. Thomas, M. A. Kirn, John Matthews, Samuel Blake, and E. C. Loh

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Isotropy, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 01 natural sciences, Universe, Space and Planetary Science, TRACER, 0103 physical sciences, ddc:520, Ultra-high-energy cosmic ray, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, Anisotropy, 010303 astronomy & astrophysics, media_common, Free parameter
Abstract

Stereo data collected by the HiRes experiment over a six year period are examined for large-scale anisotropy related to the inhomogeneous distribution of matter in the nearby Universe. We consider the generic case of small cosmic-ray deflections and a large number of sources tracing the matter distribution. In this matter tracer model the expected cosmic ray flux depends essentially on a single free parameter, the typical deflection angle theta. We find that the HiRes data with threshold energies of 40 EeV and 57 EeV are incompatible with the matter tracer model at a 95% confidence level unless theta is larger than 10 degrees and are compatible with an isotropic flux. The data set above 10 EeV is compatible with both the matter tracer model and an isotropic flux., 9 pages, 5 Postscript figures

Published
2010

10. Measurement of the Flux of Ultra High Energy Cosmic Rays by the Stereo Technique

Author

B. F. Jones, M. A. Kirn, C. Cannon, O. A. Brusova, Gordon Thomson, P. Hüntemeyer, James F. Amann, W. Deng, B. K. Zhang, C. B. Finley, Michael H. Holzscheiter, R. Riehle, S. A. Blake, Steve Schnetzer, K. Martens, A. Zech, G. Sinnis, John Matthews, R. C. Gray, C. M. Hoffman, Y. Fedorova, J. D. Smith, R. W. Springer, D. Rodriguez, R. Snow, S. R. Stratton, Gareth Hughes, John N. Matthews, Tareq Abu-Zayyad, Dmitri Ivanov, K. Kim, G. Archbold, Z. Cao, Kevin Reil, S. A. Moore, Dale Tupa, L. M. Scott, E. C. Loh, L. Perera, Konstantin Belov, C. C. H. Jui, M. M. Maestas, S. B. Thomas, B. T. Stokes, J. R. Thomas, M. Al-Seady, Y. Zhang, Pierre Sokolsky, A. O’Neill, G. W. Burt, Lawrence Wiencke, M. Sasaki, J. Findlay, John Belz, M. D. Roberts, L. J. Marek, Douglas Bergman, C. A. Painter, William Hanlon, Rasha Abbasi, N. Manago, Xiang Zhang, and M. Allen

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, High resolution, Stereoscopy, Cosmic ray, 01 natural sciences, law.invention, Optics, law, 0103 physical sciences, Ultra-high-energy cosmic ray, Ultrahigh energy, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Monocular, 010308 nuclear & particles physics, business.industry, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, business, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The High Resolution Fly's Eye experiment has measured the flux of ultrahigh energy cosmic rays using the stereoscopic air fluorescence technique. The HiRes experiment consists of two detectors that observe cosmic ray showers via the fluorescence light they emit. HiRes data can be analyzed in monocular mode, where each detector is treated separately, or in stereoscopic mode where they are considered together. Using the monocular mode the HiRes collaboration measured the cosmic ray spectrum and made the first observation of the Greisen-Zatsepin-Kuzmin cutoff. In this paper we present the cosmic ray spectrum measured by the stereoscopic technique. Good agreement is found with the monocular spectrum in all details., 20 pages, 10 figures

Published
2009

11. An upper limit on the electron-neutrino flux from the HiRes detector

Author

S. Y. Ben Zvi, M. Allen, B. F. Jones, J. Findlay, John Belz, R. C. Gray, Konstantin Belov, N. Manago, R. Riehle, J. D. Smith, Dmitri Ivanov, L. Perera, Ben Stokes, R. W. Springer, L. J. Marek, E. C. Loh, Douglas Bergman, L. M. Scott, G. Archbold, C. A. Painter, Xiang Zhang, P. Huentemeyer, J. R. Thomas, M. D. Roberts, J. H. Boyer, E. J. Mannel, C. Cannon, S. R. Stratton, Kevin Reil, O. A. Brusova, Z. Cao, C. M. Hoffman, A. O’Neill, Samuel Blake, G. W. Burt, C. B. Finley, S. A. Moore, K. Martens, Gareth Hughes, Pierre Sokolsky, Y. Fedorova, D. C. Rodriguez, John Matthews, Tareq Abu-Zayyad, Steve Schnetzer, William Hanlon, Rasha Abbasi, G. Sinnis, M. A. Kirn, C. Song, A. Zech, B. C. Knapp, M. M. Maestas, M. Seman, W. Deng, Lawrence Wiencke, James F. Amann, M. Sasaki, C. C. H. Jui, S. B. Thomas, John N. Matthews, Dale Tupa, R. Snow, K. Kim, A. Biesiadecka, Gordon Thomson, and Michael H. Holzscheiter

Subjects
Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Detector, Astrophysics (astro-ph), Bremsstrahlung, Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, Pair production, 13. Climate action, Space and Planetary Science, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Electron neutrino
Abstract

Air-fluorescence detectors such as the High Resolution Fly's Eye (HiRes) detector are very sensitive to upward-going, Earth-skimming ultrahigh energy electron-neutrino-induced showers. This is due to the relatively large interaction cross sections of these high-energy neutrinos and to the Landau-Pomeranchuk-Migdal (LPM) effect. The LPM effect causes a significant decrease in the cross sections for bremsstrahlung and pair production, allowing charged-current electron-neutrino-induced showers occurring deep in the Earth's crust to be detectable as they exit the Earth into the atmosphere. A search for upward-going neutrino-induced showers in the HiRes-II monocular dataset has yielded a null result. From an LPM calculation of the energy spectrum of charged particles as a function of primary energy and depth for electron-induced showers in rock, we calculate the shape of the resulting profile of these showers in air. We describe a full detector Monte Carlo simulation to determine the detector response to upward-going electron-neutrino-induced cascades and present an upper limit on the flux of electron-neutrinos., Comment: 13 pages, 3 figures. submitted to Astrophysical Journal

Published
2008
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12. Alternative Methods to Finding Patterns in HiRes Stereo Data

Author

R. W. Springer, L. M. Scott, Kevin Reil, Segev BenZvi, Dale Tupa, J. D. Smith, G. Archbold, Konstantin Belov, Pierre Sokolsky, M. A. Kirn, L. Perera, G. W. Burt, C. A. Painter, A. Zech, N. Manago, Gareth Hughes, Douglas Bergman, Tareq Abu-Zayyad, B. F. Jones, M. Seman, D. Rodriguez, Steve Schnetzer, J. A.J. Matthews, S. Westerhoff, Xiang Zhang, K. Kim, J. Findlay, John Belz, C. Song, B. C. Knapp, L. J. Marek, M. Sasaki, B.M. Connolly, L.R. Weincke, E. J. Mannel, R. Riehle, C. B. Finley, R. C. Gray, P. Hüntemeyer, William Hanlon, A. O’Neill, M. M. Maestas, Rasha Abbasi, Gordon Thomson, K. Martins, Z. Cao, Michael H. Holzscheiter, S. A. Moore, C. C. H. Jui, S. B. Thomas, B. T. Stokes, J. R. Thomas, E. C. Loh, J. H. Boyer, W. Deng, J. F. Amman, John N. Matthews, S. A. Blake, M. D. Roberts, C. M. Hoffman, G. Sinnis, and Y. Fedorova

Subjects
Physics, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 01 natural sciences, Galaxy, Hough transform, law.invention, Great circle, Arc (geometry), law, Sky, 0103 physical sciences, 010306 general physics, Anisotropy, 010303 astronomy & astrophysics, Energy (signal processing), media_common
Abstract

In this paper ultra-high energy cosmic rays UHECRs data observed by the HiRes fluorescence detector in stereo mode is analyzed to search for events in the sky with an arrival direction lying on a great circle. Such structure is known as the arc structure. The arc structure is expected when the charged cosmic rays pass through the galactic magnetic field. The arcs searched for could represent a broad or a small scale anisotropy depending on the proposed source model for the UHECRs. The arcs in this paper are looked for using Hough transform were Hough transform is a technique used to looking for patterns in images. No statistically significant arcs were found in this study.

Published
2007

13. First Observation of the Greisen-Zatsepin-Kuzmin Suppression

Author

R. W. Springer, Steve Schnetzer, B. T. Stokes, J. R. Thomas, N. Manago, John N. Matthews, Gordon Thomson, Kevin Reil, Douglas Bergman, Konstantin Belov, Michael H. Holzscheiter, Xiang Zhang, Naruo Sasaki, A. O’Neill, W. Deng, L. M. Scott, S. A. Blake, John Matthews, M. D. Roberts, Z. Cao, B. C. Connolly, C. M. Hoffman, S. A. Moore, Y. Fedorova, J. F. Amman, John Belz, M. Allen, L. J. Marek, C. A. Painter, E. C. Loh, Gareth Hughes, G. Archbold, Tareq Abu-Zayyad, G. W. Burt, William Hanlon, Rasha Abbasi, C. C. H. Jui, R. Riehle, S. B. Thomas, Lawrence Wiencke, A. Zech, C. Song, Dale Tupa, M. A. Kirn, G. Sinnis, S. Y. Ben Zvi, J. D. Smith, R. C. Gray, D. Rodriguez, L. Perera, S. Westerhoff, K. Kim, B. F. Jones, C. Cannon, O. A. Brusova, P. Hüntemeyer, C. B. Finley, K. Martens, M. M. Maestas, and Pierre Sokolsky

Subjects
Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), General Physics and Astronomy, High resolution, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, 0103 physical sciences, Energy spectrum, Cutoff, Ultrahigh energy, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract

The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement of the flux of ultrahigh energy (UHE) cosmic rays shows a sharp suppression at an energy of $6 \times 10^{19}$ eV, consistent with the expected cutoff energy. We observe the ``ankle'' of the cosmic-ray energy spectrum as well, at an energy of $4 \times 10^{18}$ eV. We describe the experiment, data collection, analysis, and estimate the systematic uncertainties. The results are presented and the calculation of the statistical significance of our observation is described., Comment: 4 pages, 3 figures, accepted by and to appear in PRL

Published
2007
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14. Search for Global Dipole Enhancements in the HiRes-I Monocular Data above 10^{18.5} eV

Author

M. D. Roberts, R. W. Springer, C. Sinnis, Kevin Reil, John N. Matthews, Roger W Clay, John Belz, Tareq Abu-Zayyad, William Hanlon, L. Perera, Rasha Abbasi, B.M. Connolly, Dale Tupa, K. M. Simpson, C. M. Hoffman, T.N. Thompson, Pierre Sokolsky, C. C. H. Jui, Steve Schnetzer, Lawrence Wiencke, E. C. Loh, Gordon Thomson, J. D. Smith, P. Hüntemeyer, S. B. Thomas, B. T. Stokes, J. S. Sarracino, C. A. Painter, R. Riehle, M. Sasaki, G. Archbold, S. Westerhoff, Bruce R. Dawson, James F. Amann, K. Kim, G. Martin, Douglas Bergman, N. Manago, Michael H. Holzscheiter, Jose A. Bellido, M.D. Cooper, Z. Cao, L. J. Marek, C. B. Finley, M. A. Kirn, J. A.J. Matthews, Xiang Zhang, C. Song, K. Martens, A. Zech, and Konstantin Belov

Subjects
Physics, Monocular, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Galactic Center, Centaurus A, Isotropy, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Dipole, 0103 physical sciences, Sensitivity (control systems), Anisotropy, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Several proposed source models for Ultra-High Energy Cosmic Rays (UHECRs) consist of dipole distributions oriented towards major astrophysical landmarks such as the galactic center, M87, or Centaurus A. We use a comparison between real data and simulated data to show that the HiRes-I monocular data for energies above 10^{18.5} eV is, in fact, consistent with an isotropic source model. We then explore methods to quantify our sensitivity to dipole source models oriented towards the Galactic Center, M87, and Centaurus A., Comment: 17 pages, 31 figures

Published
2003

15. Measurement of the Flux of Ultrahigh Energy Cosmic Rays from Monocular Observations by the High Resolution Fly's Eye Experiment

Author

B. T. Stokes, J. S. Sarracino, Julien Girard, K. M. Simpson, Kevin Reil, Bruce R. Dawson, T.N. Thompson, P. Hüntemeyer, R. W. Springer, Jose A. Bellido, M. D. Roberts, A. Zech, A.A. Everett, L. J. Marek, J.R. Mumford, M. A. Kirn, T. Vanderveen, C. M. Hoffman, N. Manago, R. Riehle, Douglas Bergman, G. Archbold, Steve Schnetzer, Lawrence Wiencke, Z. Cao, David Kieda, S. A. Moore, Xiang Zhang, William Hanlon, Pierre Sokolsky, John N. Matthews, C. C. H. Jui, J. A.J. Matthews, P. Morrison, J. R. Meyer, J. D. Smith, James F. Amann, Misao Sasaki, S. B. Thomas, A. N. Moosman, H. Y. Dai, M.D. Cooper, R. C. Gray, C. Song, B. F. Jones, K. Martens, Yu. A. Fedorova, E. C. Loh, John Belz, Roger W Clay, Konstantin Belov, S. Taylor, Gordon Thomson, M. W. Munro, Michael H. Holzscheiter, Tareq Abu-Zayyad, S. Westerhoff, P. Shen, K. Kim, G. Martin, G. Sinnis, Dale Tupa, L. Perera, Rasha Abbasi, and C. A. Painter

Subjects
Physics, Photomultiplier, Monocular, 010308 nuclear & particles physics, business.industry, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, Flux, Cosmic ray, Astrophysics, 01 natural sciences, 7. Clean energy, 3. Good health, Phototube, Optics, Observatory, 0103 physical sciences, Calibration, High Energy Physics::Experiment, business, 010303 astronomy & astrophysics
Abstract

We have measured the cosmic ray spectrum above 10^17.2 eV using the two air fluorescence detectors of the High Resolution Fly's Eye observatory operating in monocular mode. We describe the detector, photo-tube and atmospheric calibrations, as well as the analysis techniques for the two detectors. We fit the spectrum to a model consisting of galactic and extra-galactic sources., Comment: 4 pages, 4 figures. Uses 10pt.rtx, amsmath.sty, aps.rtx, revsymb.sty, revtex4.cls

Published
2002

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