Olivier Deligny
(CNRS/IN2P3)
30/07/2015, 14:00
CR-EX
Oral contribution
The large-scale distribution of arrival directions of high-energy cosmic rays is a key observable in attempts to understand their origin. The dipole and quadrupole moments are of special interest in revealing potential anisotropies. An unambiguous measurement of these moments as well as of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by...
Imen Al Samarai
30/07/2015, 14:15
CR-EX
Oral contribution
The large-scale distribution of arrival directions of high-energy cosmic rays carries major clues to understand their origin. The Pierre Auger Collaboration has implemented different analyses to search for dipolar and quadrupolar anisotropies in different energy ranges spanning four orders of magnitude. A common phase $\approx 270^\circ$ of the first harmonic modulation in right-ascension was...
650.
Arrival directions of the highest-energy cosmic rays detected with the Pierre Auger Observatory
Julien Aublin
(urn:Google)
30/07/2015, 14:30
CR-EX
Oral contribution
We present the results of a search for small scale anisotropies in the distribution of arrival directions of ultra-high energy cosmic rays recorded at the Pierre Auger Observatory. The data set, gathered in ten years of operation, includes arrival directions with zenith angles up to $80^\circ$, and is about three times larger than that used in earlier studies. We update the test based on...
Hiroyuki Sagawa
(RIKEN),
Igor Tkachev
(Russian Academy of Sciences (RU)),
Peter Tinyakov
(Universite Libre de Bruxelles (ULB))
30/07/2015, 14:45
CR-EX
Oral contribution
The Telescope Array has collected 7 years of data and accumulated the largest UHECR data set in the Northern hemisphere. We make use of these data to search for large- and small-scale anisotropy of UHECR. At small angular scales we examine the data for clustering of events and correlations with various classes of putative sources. At large angular scales we will present a blind search for...
Kazumasa Kawata
(ICRR, University of Tokyo)
30/07/2015, 15:00
CR-EX
Oral contribution
The Telescope Array Experiment has observed a cluster of ultrahigh energy cosmic rays, $E>57$ EeV, called the Hotspot. This was reported in (Abbasi et al., ApJ, 790, L21 (2014)), and was centered in Ursa Major. Using the first five years of data collected by the TA surface detector, the chance probability of this hotspot in an isotropic cosmic-ray sky was calculated to be 3.4$\sigma$. In this...
Dr
Haoning He
(UCLA)
30/07/2015, 15:15
CR-EX
Oral contribution
The Telescope Array (TA) collaboration has reported a hotspot, a cluster of 19 cosmic ray events with energies above $57~\rm EeV$
in a circle of $20^\circ$ radius centered at ${\rm R.A.}(\alpha)=146.^\circ7$, ${\rm Dec.}(\delta)=43.^\circ2$.
We explore the hypothesis that the hotspot could originate from a single source. By considering the energy dependent
deflections that are expected to...
