INVESTIGADORES
GARCIA Beatriz Elena
artículos
Título:
Searches for Anisotropies in the Arrival Directions of the Highest Energy Cosmic Rays Detected by the Pierre Auger Observatory
Autor/es:
THE PIERRE AUGER COLLABORATION (482 AUTHORS IN ALPHABETICAL ORDER); GARCIA, B
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2015 vol. 804 p. 1 - 18
ISSN:
0004-637X
Resumen:
P { margin-bottom: 0.21cm; }
We
analyze the distribution of arrival directions of ultra-high-energy
cosmic rays recorded at the Pierre Auger Observatory
in 10 years of operation. The data set, about three times larger than
that used in earlier studies, includes
arrival directions with zenith angles up to 80°
, thus covering from -90ï?°
to +45ï?°
in declination. After updating
the fraction of events correlating with the active galactic nuclei (
AGNs)
in the Véron-Cetty and Véron catalog,
we subject the arrival directions of the data with energies in excess
of 40 EeV to different tests for anisotropy.
We search for localized excess fl
uxes, self-clustering of event directions at angular scales up to 30°
, and
different threshold energies between 40 and 80 EeV. We then look for
correlations of cosmic rays with celestial
structures both in the Galaxy (
the Galactic Center and Galactic Plane)
and in the local universe (
the Super-Galactic
Plane)
. We also examine their correlation with different populations of
nearby extragalactic objects: galaxies
in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with
jets, and the Centaurus A (
CenA)
galaxy. None of the tests show statistically signifi
cant evidence of anisotropy. The strongest departures from isotropy
(
post-trial probability ~1.4
%)
are obtained for cosmic rays with E
>
58
EeV in rather large windows around
Swift AGNs closer than 130 Mpc and brighter than 1044
erg s−1
(
18°
radius)
, and around the direction of Cen
A (
15°
radius)