Event calendar file
3-11 July 2007
Merida, Mexico
Mexico/General timezone
- icrc2007@icrc2007.unam.mx
Support
HE 1.4.B
Place
Location: Merida, Mexico
Room: Yucatan II+III+IV (Fiesta Americana)
Date:
7 Jul 08:30 - 11:55
Timetable | Contribution List
Displaying 14
contributions
out of
14
The arrival directions of ultrahigh energy extensive air showers registered at
the Yakutsk array are considered. The correlations of maxima in the distribution
of arrival directions of showers and doublets with the pulsar coordinates
located in the galactic plane are found. It is shown that the correlation of the
arrival directions of ultrahigh energy particles with the plane of Virgo clus
... More
Presented by Dr. Alexei MIKHAILOV
on
7/7/2007
at
14:42
Due to geomagnetic cascading, the properties of air showers initiated by photons
above 10^19 eV depend strongly on the arrival direction and on the geographical
location of the experimental site. This offers the possibility of a complementary
search for such ultra-high energy photons with observatories located at sites with
significantly different local geomagnetic field. In this paper we comp
... More
Presented by Dr. Piotr HOMOLA
on
7/7/2007
at
16:42
In a recently proposed model the cosmic rays spectrum at energies above EeV can be
fitted with a minimal number of unknown parameters assuming that the extragalactic
cosmic rays are only protons with a power law source spectrum. Within this minimal
model, after fitting the observed HiRes spectrum with four parameters (proton
injection spectrum power law index, maximum energy, minimum distance
... More
Presented by Dr. Oleg KALASHEV
on
7/7/2007
at
14:18
We study the propagation of cosmic rays at the highest energies of different compositions and discuss the
implications for anisotropy studies of future UHECR observatories. The evolution of the horizon of cosmic rays as a
function of the energy is mass dependent: low and intermediate mass nuclei can only originate from very nearby
sources above a few 10^19 eV and the composition above 4.10^1
... More
Presented by Prof. Angela OLINTO
on
7/7/2007
at
16:18
Relativistic outflows carrying large scale magnetic fields have large
inductive potential and may accelerate protons to ultra high energies.
We discuss a novel scheme of Ultra-High Energy Cosmic
Ray acceleration due to drifts in
magnetized, cylindrically collimated, sheared jets of powerful active galaxies.
We point out that a
positively charged particle carried by such a flow is in
... More
Presented by Mr. Maxim LYUTIKOV
on
7/7/2007
at
13:42
The two-point autocorrelation function of ultra-high energy cosmic ray
(UHECR) arrival directions has a broad maximum around 25 degrees,
combining the data with energies above $4\times 10^{19}$ eV (in the
HiRes energy scale) of the HiRes stereo, AGASA, Yakutsk and SUGAR
experiments. This signal is not or only marginally present analyzing
events of a single experiment, but becomes significant
... More
Presented by Prof. Michael KACHELRIESS
on
7/7/2007
at
13:30
The Large Area Air Shower experiments have been observing
extensive air showers at sea level, in large part of Japan.
The data set obtained for more than 10 years are going to be analyzed
in order to study isotropic and anisotropy nature of cosmic ray
arrival directions. We compare our results with diffusive propagation
model of galactic cosmic rays in one and two dimensional anisotropy
anal
... More
Presented by Dr. Atsushi IYONO
on
7/7/2007
at
16:30
Similar to the GZK cutoff, the dip is a signature of UHE proton
interaction with Cosmic Microwave Radiation (CMB). It is produced
due electron-positron production in collisions of protons with CMB
photons. The dip is located in energy range 1 - 40 EeV. It is
demonstrated that the dip is very well confirmed by the data of
AGASA, Fly's Eye, Hires and Yakutsk detectors. Since
... More
Presented by Prof. Veniamin BEREZINSKY
on
7/7/2007
at
15:54
When combining the public available data of cosmic ray arrival directions with
energies above 4x10^19 eV (HiRes energy scale), a broad maximum around 25 degrees
was recently found in the cumulative two-point autocorrelation function. This has
been intriguingly interpreted as the first imprint of the filamentary pattern of
large scale structures (LSS) of matter in the near universe. We analy
... More
Presented by Dr. Pasquale Dario SERPICO
on
7/7/2007
at
14:06
We simulate the arrival distribution of ultra-high-energy (UHE) protons above $10^{19}$
eV by calculating their propagation, considering structured extragalactic magnetic
field (EGMF) with several strengths and a Galactic magnetic field (GMF). We estimate
the most appropriate source number density of UHE protons that reproduces
the small-scale anisotropy observed by Akeno Giant Air Shower Arr
... More
Presented by Mr. Hajime TAKAMI
on
7/7/2007
at
16:06
The observation of ultra-high energy (UHE) photons above 1 EeV
would open a new window of cosmic-ray research with possible impact
on astrophysics, particle and fundamental physics. The advent of new
giant air shower experiments, particularly the Pierre Auger Observatory,
offers a unique potential to search for such photons.
Status and prospects of experimental photon searches are rep
... More
Presented by Dr. Markus RISSE
on
7/7/2007
at
15:30
We will discuss the main theoretical and phenomenological consequences
of the diffusion equation solution for Ultra High Energy Cosmic Rays
in an expanding Universe. The comparison of the two solution in the
case of static and expanding Universe will be also discussed.
Presented by Dr. Roberto ALOISIO
on
7/7/2007
at
14:30
Large-scale accretion shocks around massive clusters of galaxies, generically
expected in hierarchical scenarios of cosmological structure formation, are shown to
be plausible sources of the observed ultrahigh energy cosmic rays (UHECRs) by
accelerating a mixture of heavy nuclei including the iron group elements. Current
observations can be explained if the source composition at injection for
... More
Presented by Dr. Susumu INOUE
on
7/7/2007
at
13:54
We discuss the small scale anisotropy signal predicted for present and future UHECR
experiments such as Auger, Telescope Array, Auger North and EUSO. We relax the
unrealistic, but commonly used assumption that the sources are all equal and we
concentrate our attention on how the expected signal depends on possible
distributions of the properties of the sources such as a luminosity function or
... More
Presented by Dr. Daniel DE MARCO
on
7/7/2007
at
15:42
