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Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei
R. U. Abbasi, T. Abu-Zayyad, M. Allen +61
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 (A…
Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei
The Pierre Auger Collaboration
Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the…
Measurement of Aerosols at the Pierre Auger Observatory
S. Y. BenZvi, F. Arqueros, R. Cester +38
The air fluorescence detectors (FDs) of the Pierre Auger Observatory are vital for the determination of the air shower energy scale. To compensate for variations in atmospheric con…
The Lidar System of the Pierre Auger Observatory
S. Y. BenZvi, R. Cester, M. Chiosso +27
The Pierre Auger Observatory in Malargue, Argentina, is designed to study the origin of ultrahigh energy cosmic rays with energies above 10^18 eV. The energy calibration of the det…
Studies of systematic uncertainties in the estimation of the monocular aperture of the HiRes experiment
HiRes Collaboration
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 affec…
Search for Point Sources of Ultra--High-Energy Cosmic Rays Above 10^19 eV Using a Maximum Likelihood Ratio Test
Stefan Westerhoff, Chad B. Finley
We present the results of a search for cosmic ray point sources at energies above 10^19 eV in the HiRes stereo data set. The analysis is based on a maximum likelihood ratio test us…
Search for Cross-Correlations of Ultra--High-Energy Cosmic Rays with BL Lacertae Objects
Chad B. Finley, Stefan Westerhoff
We present the results of searches for correlation between ultra--high-energy cosmic rays observed in stereo mode by the High Resolution Fly's Eye (HiRes) experiment and objects of…
Absolute calibration of imaging atmospheric Cherenkov telescopes
N. Shepherd, J. H. Buckley, O. Celik +5
A calibrated laser pulse propagating through the atmosphere produces a flash of Rayleigh scattered light with an intensity that can be calculated very accurately when atmospheric c…
Search for Point Sources of Ultra-High Energy Cosmic Rays Above 40 EeV Using a Maximum Likelihood Ratio Test
s Eye Collaboration, G. R. Farrar
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…
A Study Of Very Inclined Showers In The Pierre Auger Observatory
M. Ave
The Engineering Array of the Auger Observatory has been running successfully since 2001 and inclined showers have been recorded from the start. We have analysed the events with zen…
Observations of the supernova remnant W28 at TeV energies
G. P. Rowell, T. Naito, S. A. Dazeley +24
The atmospheric Cerenkov imaging technique has been used to search for point-like and diffuse TeV gamma-ray emission from the southern supernova remnant, W28, and surrounding regio…
The Cangaroo-III Project
Masaki Mori, S. A. Dazeley, P. G. Edwards +28
The CANGAROO-III project,which consists of an array of four 10 m imaging Cherenkov telescopes,has just started being constructed in Woomera, South Australia,in a collaboration betw…
The SNR W28 at TeV Energies
G. P. Rowell, T. Naito, S. A. Dazeley +24
The southern supernova remnant (SNR)W28 was observed in 1994 and 1995 by the CANGAROO 3.8m telescope in a search formulti-TeV gamma ray emission, using the Cerenkov imaging techniq…
Initial Performance of CANGAROO-II 7m telescope
Hidetoshi Kubo, S. A. Dazeley, P. G. Edwards +28
CANGAROO group constructed an imaging air Cherenkov telescope (CANGAROO-II) in March 1999 atWoomera, South Australia to observe celestial gamma-rays in hundreds GeV region. It has…
Construction of New 7m Imaging Air Čerenkov Telescope of CANGAROO
T. Tanimori, S. A. Dazeley, P. G. Edwards +28
CANGAROO group has constructed the new large imaging Air \v Cerenkov telescope to exploit hundred GeV region gamma-ray astronomy in March 1999 at Woomera, South Australia. It has a…
Search for TeV Gamma Rays from the SNR RXJ1713.7-3946
H. Muraishi, T. Tanimori, S. Yanagita +28
The shell type SNR RXJ1713.7-3946 is a new SNR discovered by the ROSAT all sky survey. Recently, strong non-thermal X-ray emission from the northwest part of the remnant was detect…
Data Acquisition System of the CANGAROO-II Telescope
M. Mori, S. A. Dazeley, P. G. Edwards +28
The data acquisition system for the new CANGAROO-II 7m telescope is described.
An Optical Reflector for the CANGAROO-II Telescope
Akiko Kawachi, J. Kushida, S. A. Dazeley +28
We have been successful in developing light and durable mirrors made of CFRP (Carbon Fiber Reinforced Plastic) laminates for the reflector of the new CANGAROO-II 7 m telescope. The…
TeV gamma-ray observations of three X-ray selected BL Lacs
M. D. Roberts, P. McGee, S. A. Dazeley +25
Despite extensive surveys of extragalactic TeV gamma-ray candidates only 3 sources have so far been detected. All three are northern hemisphere objects and all three are low-redshi…
TeV observations of Centaurus A
G. P. Rowell, S. A. Dazeley, P. G. Edwards +24
We have searched for TeV gamma-rays from Centaurus A and surrounding region out to +/- 1.0 deg using the CANGAROO 3.8m telescope. No evidence for TeV gamma-ray emission was observe…
TeV gamma-ray observations of southern BL Lacs with the CANGAROO 3.8m Imaging Telescope
M. D. Roberts, S. A. Dazeley, P. G. Edwards +32
Observational and theoretical results indicate that low-redshift BL Lacertae objects are the most likely extragalactic sources to be detectable at TeV energies. In this paper we pr…
The Uuniversity of Durham Mark 6 Gamma Ray Telescope
P. Armstrong, P. M. Chadwick, P. J. Cottle +18
The design, construction and operation of the University of Durham ground-based gamma ray telescope is discussed. The telescope has been designed to detect gamma rays in the < 200…
Discovery of TeV Gamma Rays from SN1006: Further Evidence for the SNR Origin of Cosmic Rays
T. Tanimori, Y. Hayami, S. Kamei +36
This paper reports the first discovery of TeV gamma-ray emission from a supernova remnant made with the CANGAROO 3.8 m Telescope. TeV gamma rays were detected at the sky position a…
Detection of Gamma Rays of Up to 50 TeV From the Crab Nebula
T. Tanimori, K. Sakurazawa, S. A. Dazeley +28
Gamma rays with energies greater than 7 TeV from the Crab pulsar/nebula have been observed at large zenith angles, using the Imaging Atmospheric Technique from Woomera, South Austr…