3-11 July 2007
Merida, Mexico
Mexico/General timezone
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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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.A
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.1.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
Type: Oral Session: HE 1.4.B
Track: HE.1.4.B
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
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