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19922026
Showing 2006 · astro-phShow all

43 papers · 2 filters

astro-ph2006

Physics Results of the Pierre Auger Observatory

V. Van Elewyck

The Southern Pierre Auger Observatory is now nearing completion and the accumulating data sample has already allowed to extract scientific results of relevance for ultra-high energ…

astro-ph2006★ 82 cited

The evolution of clusters in the CLEF cosmological simulation: X-ray structural and scaling properties

Scott T. Kay, Antonio C. da Silva, Nabila Aghanim +5

We present results from a study of the X-ray cluster population that forms within the CLEF cosmological hydrodynamics simulation, a large N-body/SPH simulation of the Lambda CDM co…

astro-ph2006★ 13 cited

High resolution gamma ray spectroscopy of flares on the east and west limbs of the Sun

M. J. Harris, V. Tatischeff, J. Kiener +2

A new generation of Ge-based high-resolution gamma-ray spectrometers has allowed accurate measurements to be made of the profiles, widths and energies of the gamma-ray lines emitte…

astro-ph2006★ 40 cited

Identification of backgrounds in the EDELWEISS-I dark matter search experiment

S. Fiorucci, A. Benoit, L. Berge +36

This paper presents our interpretation and understanding of the different backgrounds in the EDELWEISS-I data sets. We analyze in detail the several populations observed, which inc…

astro-ph2006★ 125 cited

Multi-scale Hall-MHD turbulence in the solar wind

S. Galtier, E. Buchlin

Solar wind magnetic fluctuation spectra exhibit a significant power law steepening at frequencies f>1Hz. The origin of this multi-scaling is investigated through dispersive Hall ma…

astro-ph2006★ 34 cited

Is 6-Li in metal-poor halo stars produced in situ by solar-like flares?

V. Tatischeff, J. -P. Thibaud

The high 6-Li abundances recently measured in metal-poor halo stars are far above the value predicted by Big Bang nucleosynthesis. They cannot be explained by galactic cosmic-ray i…

astro-ph2006★ 2 cited

Plasma diagnostic of a solar prominence from hydrogen and helium resonance lines

N. Labrosse, J. -C. Vial, P. Gouttebroze

We present the first comparison of profiles of H et He resonance lines observed by SUMER with theoretical profiles computed with our non-LTE radiative transfer code. We use the H I…

astro-ph2006★ 161 cited

Formation and destruction of polycyclic aromatic hydrocarbon clusters in the interstellar medium

M. Rapacioli, F. Calvo, C. Joblin +3

The competition between the formation and destruction of coronene clusters under interstellar conditions is investigated theoretically. The unimolecular nucleation of neutral clust…

astro-ph2006★ 278 cited

Accretion Rates in Herbig Ae stars

R. Garcia Lopez, A. Natta, L. Testi +1

Accretion rates from disks around pre-main sequence stars are of importance for our understanding of planetary formation and disk evolution. We provide in this paper estimates of t…

astro-ph2006★ 213 cited

The Spitzer Survey of the Small Magellanic Cloud: S3MC Imaging and Photometry in the Mid- and Far-Infrared Wavebands

Alberto D. Bolatto, Joshua D. Simon, Snezana Stanimirovic +12

We present the initial results from the Spitzer Survey of the Small Magellanic Cloud (S3MC), which imaged the star-forming body of the Small Magellanic Cloud (SMC) in all seven MIP…

astro-ph2006★ 96 cited

Radioelectric Field Features of Extensive Air Showers Observed with CODALEMA

D. Ardouin, A. Belletoile, D. Charrier +12

Based on a new approach to the detection of radio transients associated with extensive air showers induced by ultra high energy cosmic rays, the experimental apparatus CODALEMA is…

astro-ph2006★ 60 cited

Comparing dynamical and photometric-stellar masses of early-type galaxies at z ~ 1

A. Rettura, P. Rosati, V. Strazzullo +14

The purpose of this study is to explore the relationship between galaxy stellar masses, based on multiwavelength photometry spectral template fitting and dynamical masses based on…

astro-ph2006★ 26 cited

Solar Oscillation Frequency Changes on Time Scales of Nine Days

S. C. Tripathy, F. Hill, K. Jain +1

We establish that global solar p-mode frequencies can be measured with sufficient precision on time scales as short as nine days to detect activity-related shifts. Using ten years…

astro-ph2006★ 24 cited

Effect of motions in prominences on the helium resonance lines in the extreme ultraviolet

Nicolas Labrosse, Pierre Gouttebroze, Jean-Claude Vial

We aim at studying the effect of radial motions on the spectrum emitted by moving prominences in the helium resonance lines and at facilitating the interpretation of observations,…

astro-ph2006★ 83 cited

The abundances of nitrogen-containing molecules during pre-protostellar collapse

D. R. Flower, G. Pineau des Forets, C. M. Walmsley

We have studied the chemistry of nitrogen--bearing species during the initial stages of protostellar collapse, with a view to explaining the observed longevity of N2H+ and NH3 and…

astro-ph2006★ 66 cited

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

The Pierre Auger Collaboration

Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this…

astro-ph2006★ 940 cited

Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds

P. Tisserand, L. Le Guillou, C. Afonso +35

The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called ``machos'') could be a major component of the dark matter halo of the Milky…

astro-ph2006★ 46 cited

solarFLAG hare and hounds: on the extraction of rotational p-mode splittings from seismic, Sun-as-a-star data

W. J. Chaplin, T. Appourchaux, F. Baudin +18

We report on results from the first solar Fitting at Low-Angular degree Group (solar FLAG) hare-and-hounds exercise. The group is concerned with the development of methods for extr…

astro-ph2006★ 68 cited

The Robinson Gravitational Wave Background Telescope (BICEP): a bolometric large angular scale CMB polarimeter

K. W. Yoon, P. A. R. Ade, D. Barkats +24

The Robinson Telescope (BICEP) is a ground-based millimeter-wave bolometric array designed to study the polarization of the cosmic microwave background radiation (CMB) and galactic…

astro-ph2006★ 20 cited

HETE-2 Localizations and Observations of Four Short Gamma-Ray Bursts: GRBs 010326B, 040802, 051211 and 060121

T. Q. Donaghy, D. Q. Lamb, T. Sakamoto +34

Here we report the localizations and properties of four short-duration GRBs localized by the High Energy Transient Explorer 2 satellite (HETE-2): GRBs 010326B, 040802, 051211 and 0…

astro-ph2006★ 121 cited

An upper limit to the photon fraction in cosmic rays above 10^19 eV from the Pierre Auger Observatory

Pierre Auger Collaboration

An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10^19 eV, based on observations of the depth of shower maximum perf…

astro-ph2006★ 127 cited

Cosmogenic Neutrinos from the propagation of Ultra High Energy Nuclei

D. Allard, M. Ave, N. Busca +5

We calculate the flux of neutrinos generated by the propagation of ultra-high energy nuclei over cosmological distances. The propagation takes into account the interactions with co…

astro-ph2006★ 45 cited

The Photometric and Kinematic Structure of Face-On Disk Galaxies. I. Sample Definition, H-alpha Integral Field Spectroscopy, and HI Line-Widths

David R. Andersen, Matthew A. Bershady, Linda S. Sparke +5

We present a survey of the photometric and kinematic properties of 39 nearby, nearly face-on disk galaxies. Our approach exploits echelle-resolution integral-field spectroscopy of…

astro-ph2006★ 5 cited

On the viability of holistic cosmic-ray source models

J. Aublin, E. Parizot

We consider the energy spectrum of cosmic-rays (CRs) from a purely phenomenological point of view and investigate the possibility that they all be produced by the same type of sour…