893 research outputs found
Description of Atmospheric Conditions at the Pierre Auger Observatory Using Meteorological Measurements and Models
Atmospheric conditions at the site of a cosmic ray observatory must be known
well for reconstructing observed extensive air showers, especially when
measured using the fluorescence technique. For the Pierre Auger Observatory, a
sophisticated network of atmospheric monitoring devices has been conceived.
Part of this monitoring was a weather balloon program to measure atmospheric
state variables above the Observatory. To use the data in reconstructions of
air showers, monthly models have been constructed. Scheduled balloon launches
were abandoned and replaced with launches triggered by high-energetic air
showers as part of a rapid monitoring system. Currently, the balloon launch
program is halted and atmospheric data from numerical weather prediction models
are used. A description of the balloon measurements, the monthly models as well
as the data from the numerical weather prediction are presented
Comparison of available measurements of the absolute fluorescence yield
The uncertainty in the absolute value of the fluorescence yield is still one
of the main contributions to the total error in the reconstruction of the
primary energy of ultra-energetic air showers using the fluorescence technique.
A significant number of experimental values of the fluorescence yield have been
published in the last years, however reported results are given very often in
different units (photons/MeV or photons/m) and for different wavelength
intervals. In this work we present a comparison of available results normalized
to its value in photons/MeV for the 337 nm band at 800 hPa and 293 K. The
conversion of photons/m to photons/MeV requires an accurate determination of
the energy deposited by the electrons in the field of view of the experimental
setup. We have calculated the energy deposition for each experiment by means of
a detailed Monte Carlo simulation including when possible the geometrical
details of the particular setup. Our predictions on deposited energy, as well
as on some geometrical factors, have been compared with those reported by the
authors of the corresponding experiments and possible corrections to the
fluorescence yields are proposed.Comment: 29 pages, 5 figures Revised version submitted to Astroparticle
Physic
Characteristics of geomagnetic cascading of ultra-high energy photons at the southern and northern sites of the Pierre Auger Observatory
Cosmic-ray photons above 10^19 eV can convert in the geomagnetic field and
initiate a preshower, i.e. a particle cascade before entering the atmosphere.
We compare the preshower characteristics at the southern and northern sites of
the Pierre Auger Observatory. In addition to a shift of the preshower patterns
on the sky due to the different pointing of the local magnetic field vectors,
the fact that the northern Auger site is closer to the geomagnetic pole results
in a different energy dependence of the preshower effect: photon conversion can
start at smaller energies, but large conversion probabilitites (>90%) are
reached for the whole sky at higher energies compared to the southern Auger
site. We show how the complementary preshower features at the two sites can be
used to search for ultra-high energy photons among cosmic rays. In particular,
the different preshower characteristics at the northern Auger site may provide
an elegant and unambiguous confirmation if a photon signal is detected at the
southern site.Comment: 25 pages, 14 figures, minor changes, conclusions unchanged, Appendix
A replaced, accepted by Astroparticle Physic
On a possible photon origin of the most-energetic AGASA events
In this work the ultra high energy cosmic ray events recorded by the AGASA
experiment are analysed. With detailed simulations of the extensive air showers
initiated by photons, the probabilities are determined of the photonic origin
of the 6 AGASA events for which the muon densities were measured and the
reconstructed energies exceeded 10^20 eV. On this basis a new, preliminary
upper limit on the photon fraction in cosmic rays above 10^20 eV is derived and
compared to the predictions of exemplary top-down cosmic-ray origin models.Comment: 3 pages, 1 figure, 2 tables; presented at XIII ISVHECRI, Pylos,
Greec
Characterisation of the electromagnetic component in ultra-high energy inclined air showers
Inclined air showers - those arriving at ground with zenith angle with
respect to the vertical theta > 60 deg - are characterised by the dominance of
the muonic component at ground which is accompanied by an electromagnetic halo
produced mainly by muon decay and muon interactions. By means of Monte Carlo
simulations we give a full characterisation of the particle densities at ground
in ultra-high energy inclined showers as a function of primary energy and mass
composition, as well as for different hadronic models assumed in the
simulations. We also investigate the effect of intrinsic shower-to-shower
fluctuations in the particle densities.Comment: 31 pages, 18 figures, accepted for publication in Astroparticle
Physic
Constraints on the Ultra High Energy Photon flux using inclined showers from the Haverah Park array
We describe a method to analyse inclined air showers produced by ultra high
energy cosmic rays using an analytical description of the muon densities. We
report the results obtained using data from inclined events
(60^{\circ}<\theta<80^{\circ}) recorded by the Haverah Park shower detector for
energies above 10^19 eV. Using mass independent knowledge of the UHECR spectrum
obtained from vertical air shower measurements and comparing the expected
horizontal shower rate to the reported measurements we show that above 10^19 eV
less than 48 % of the primary cosmic rays can be photons at the 95 % confidence
level and above 4 X 10^19 eV less than 50 % of the cosmic rays can be photonic
at the same confidence level. These limits place important constraints on some
models of the origin of ultra high-energy cosmic rays.Comment: 45 pages, 25 figure
Improved model for the analysis of air fluorescence induced by electrons
A model recently proposed for the calculation of air-fluorescence yield
excited by electrons is revisited. Improved energy distributions of secondary
electrons and a more realistic Monte Carlo simulation including some additional
processes have allowed us to obtain more accurate results. The model is used to
study in detail the relationship between fluorescence intensity and deposited
energy in a wide range of primary energy (keVs - GeVs). In addition,
predictions on the absolute value of the fluorescence efficiency in the absence
of collisional quenching will be presented and compared with available
experimental data.Comment: Contribution to the 5th Fluorescence Workshop, El Escorial, Madrid,
Spain, September 2007, to appear in Nuclear Instruments and Methods A.
Revised version.- More details on the comparison with experimental dat
Identifying Nearby UHECR Accelerators using UHE (and VHE) Photons
Ultra-high energy photons (UHE, E > 10^19 eV) are inevitably produced during
the propagation of 10^20 eV protons in extragalactic space. Their short
interaction lengths (<20 Mpc) at these energies, combined with the impressive
sensitivity of the Pierre Auger Observatory detector to these particles, makes
them an ideal probe of nearby ultra-high-energy cosmic ray (UHECR) sources. We
here discuss the particular case of photons from a single nearby (within 30
Mpc) source in light of the possibility that such an object might be
responsible for several of the UHECR events published by the Auger
collaboration. We demonstrate that the photon signal accompanying a cluster of
a few > 6x10^19 eV UHECRs from such a source should be detectable by Auger in
the near future. The detection of these photons would also be a signature of a
light composition of the UHECRs from the nearby source.Comment: 4 pages, 2 figures, accepted for publication in PR
Temperature and Humidity Dependence of Air Fluorescence Yield measured by AIRFLY
The fluorescence detection of ultra high energy cosmic rays requires a
detailed knowledge of the fluorescence light emission from nitrogen molecules
over a wide range of atmospheric parameters, corresponding to altitudes typical
of the cosmic ray shower development in the atmosphere. We have studied the
temperature and humidity dependence of the fluorescence light spectrum excited
by MeV electrons in air. Results for the 313.6 nm, 337.1 nm, 353.7 nm and 391.4
nm bands are reported in this paper. We found that the temperature and humidity
dependence of the quenching process changes the fluorescence yield by a
sizeable amount (up to 20%) and its effect must be included for a precise
estimation of the energy of ultra high energy cosmic rays.Comment: presented at the 5th Fluorescence Workshop, El Escorial - Madrid,
Spain, 16 - 20 September 2007, to appear in Nuclear Instruments and Methods
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