Coverage and large scale anisotropies estimation methods for the Pierre Auger Observatory

Conference · Fri Jul 01 00:00:00 EDT 2005

OSTI ID:878968

Hamilton, Jean-Christophe

When searching for anisotropies in the arrival directions of Ultra High Energy Cosmic Rays, one must estimate the number of events expected in each direction of the sky in the case of a perfect isotropy. We present in this article a new method, developed for the Auger Observatory, based on a smooth estimate of the zenith angle distribution obtained from the data itself (which is essentially unchanged in the case of the presence of a large scale anisotropy pattern). We also study the sensitivity of several methods to detect large-scale anisotropies in the cosmic ray arrival direction distribution : Rayleigh analysis, dipole fitting and angular power spectrum estimation.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 878968
• Report Number(s): FERMILAB-CONF-05-308-E-TD; arXiv eprint number astro-ph/0507517; TRN: US200621%%292
• Resource Relation: Conference: Presented at 29th International Cosmic Ray Conference (ICRC 2005), Pune, India, 3-11 Aug 2005
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
DIPOLES
DISTRIBUTION
ISOTROPY
SENSITIVITY
SKY
ASTROPHYSICS
Astrophysics