Large scale anisotropy studies with the Pierre Auger Observatory

Details Large scale anisotropy studies with the Pierre Auger Observatory Large scale anisotropy studies with the Pierre Auger Observatory

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astra...7..125g&link_type=abstract

Astrophysics and Space Sciences Transactions, Volume 7, Issue 2, 2011, pp.125-129

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Pierre Auger Observatory in Argentina measures air showers initiated by cosmic rays at EeV energy scales (1 EeV = 1018 eV). An important goal of the collaboration is to study the distribution of arrival directions of the primary particles and quantify potential anisotropies therein. Using data collected by the surface detector (SD) array of the Pierre Auger Observatory since 1 January 2004, we study large scale anisotropies in different energy windows. Modulations of the event rate within the period of a sidereal day are studied by means of a periodicity analysis accounting for local effects which may induce an artificial anisotropy. We present results for the event rate modulation in right ascension and derive upper limits for the equatorial component of a dipole amplitude (Auger Coll., 2011; Bonino, 2009).

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