ICRC2015

Session

Parallel CR01 Aniso

30 Jul 2015, 11:00

World Forum

390. Anisotropy in Cosmic Ray Arrival Directions Using IceCube and IceTop

Stefan Westerhoff (University of Wisconsin-Madison)

30/07/2015, 11:00

CR-EX

Oral contribution

We provide an update on the continued observation of anisotropy in the arrival direction distribution of cosmic rays in the southern hemisphere. The IceCube neutrino observatory recorded more than 250 billion events between May 2009 and May 2014. Subtracting dipole and quadrupole fit maps, we can use these increased statistics to see significant small-scale structure that approaches our median...

221. Search for High Energy Neutron Point Sources in IceTop

Michael Sutherland

30/07/2015, 11:15

CR-EX

Oral contribution

IceTop can detect an astrophysical flux of neutrons from Galactic sources as an excess of cosmic ray air showers arriving from the source direction. Neutrons are undeflected by the Galactic magnetic field and can typically travel 10 ($E$ / PeV) pc before decay. Two searches through the IceTop dataset are performed to look for a statistically significant excess of events with energies above 10...

1342. Full-Sky Analysis of Cosmic-Ray Anisotropy with IceCube and HAWC

Juan Carlos Diaz Velez (University of Wisconsin-Madison)

30/07/2015, 11:30

CR-EX

Oral contribution

During the past two decades, experiments in both the Northern and Southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of galactic cosmic rays. The relative amplitude of the anisotropy is $10^{−4} - 10^{−3}$. However, each of these individual measurements is restricted by limited sky coverage, and so the...

147. Observation of Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays With HAWC

Daniel Fiorino

30/07/2015, 11:45

CR-EX

Oral contribution

The High-Altitude Water Cherenkov (HAWC) Observatory, located 4100 m above sea level near Pico de Orizaba (19° N) in Mexico, is sensitive to gamma rays and cosmic rays at TeV energies. The arrival direction distribution of cosmic rays at these energies shows significant anisotropy on several angular scales, with a relative intensity ranging between $10^{-3}$ and $10^{-4}$. We present the...

458. A study of the first harmonic of the large scale anisotropies with the KASCADE-Grande experiment

Andrea Chiavassa (Universita` di Torino)

30/07/2015, 12:00

CR-EX

Oral contribution

In this contribution we present the results of a search for large scale anisotropies performed, using the East-West method, with the whole data set of the KASCADE-Grande experiment. The counts distribution in sidereal time intervals of 20 minutes, obtained applying the East-West analysis technique (correctly removing instrumental and atmospheric effects), is analyzed in terms of a dipole...

524. Measurement of (p+He)-induced anisotropy in cosmic rays with ARGO-YBJ

Roberto Iuppa (Universita e INFN Roma Tor Vergata (IT))

30/07/2015, 12:15

CR-EX

Oral contribution

Deviations from isotropy in the cosmic ray arrival direction distribution indicate the laboratory reference frame moving with respect to the cosmic radiation. When data are ordered in sidereal time, any effect is of great importance, as it may trace potential sources of cosmic rays and probe their propagation through magnetic fields. For the same reason, to decipher results implies unfolding...