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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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28 papers · 2 filters
HESS VHE Gamma-Ray Sources Without Identified Counterparts
HESS Collaboration, F. Aharonian
The detection of gamma rays in the very-high-energy (VHE) energy range (100 GeV--100 TeV) provides a direct view of the parent population of ultra-relativistic particles found in a…
Upper limit on the diffuse flux of UHE tau neutrinos from the Pierre Auger Observatory
The Pierre Auger Collaboration
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos that interact in the Earth's crust. Tau leptons from charged-cur…
Upper Limits from HESS AGN Observations in 2005-2007
HESS Collaboration, F. Aharonian
AIMS: Very high energy (VHE; E>100 GeV) gamma-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. METHODS: VHE observations of a sample of…
Light curves of five type Ia supernovae at intermediate redshift
R. Amanullah, V. Stanishev, A. Goobar +14
We present multi-band light curves and distances for five type Ia supernovae at intermediate redshifts, 0.18<z<0.27. Three telescopes on the Canary Island of La Palma, INT, NOT and…
HESS Observations and VLT Spectroscopy of PG 1553+113
HESS Collaboration, F. Aharonian
AIMS: The properties of the very high energy (VHE; E>100 GeV) gamma-ray emission from the high-frequency peaked BL Lac PG 1553+113 are investigated. An attempt is made to measure t…
A New Determination of the High Redshift Type Ia Supernova Rates with the Hubble Space Telescope Advanced Camera for Surveys
N. Kuznetsova, K. Barbary, B. Connolly +27
We present a new measurement of the volumetric rate of Type Ia supernova up to a redshift of 1.7, using the Hubble Space Telescope (HST) GOODS data combined with an additional HST…
Estimates of multipolar coefficients to search for cosmic ray anisotropies with non-uniform or partial sky coverage
Pierre Billoir, Olivier Deligny
We study the possibility to extract the multipolar moments of an underlying distribution from a set of cosmic rays observed with non-uniform or even partial sky coverage. We show t…
A Spectacular VHE Gamma-Ray Outburst from PKS 2155-304 in 2006
W. Benbow, C. Boisson, L. Costamante +10
Since 2002 the VHE (>100 GeV) gamma-ray flux of the high-frequency peaked BL Lac PKS 2155-304 has been monitored with the High Energy Stereoscopic System (HESS). An extreme gamma-r…
New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
HESS Collaboration, F. Aharonian
AIMS: To investigate the very high energy (VHE: >100 GeV) gamma-ray emission from the high-frequency peaked BL Lac 1ES 0229+200. METHODS: Observations of 1ES 0229+200 at energies a…
SNLS Spectroscopy: Testing for Evolution in Type Ia Supernovae
T. J. Bronder, I. M. Hook, P. Astier +19
Aims: We present a quantitative study of a new data set of high redshift Type Ia supernovae spectra, observed at the Gemini telescopes during the first 34 months of the Supernova L…
Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda-CDM N-body simulation results
J. Lavalle, Q. Yuan, D. Maurin +1
Anti-proton and positron Galactic cosmic ray spectra are among the key targets for indirect detection of dark matter. The boost factors, corresponding to an enhancement of the sign…
Cosmic Ray production of Beryllium and Boron at high redshift
Emmanuel Rollinde, David Maurin, Elisabeth Vangioni +2
Recently, new observations of Li6 in Pop II stars of the galactic halo have shown a surprisingly high abundance of this isotope, about a thousand times higher than its predicted pr…
An Exceptional VHE Gamma-Ray Flare of PKS 2155-304
F. Aharonian
The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.116 is a well-known VHE (>100 GeV) gamma-ray emitter. Since 2002 its VHE flux has been monitored using the H.E.S.S. st…
A coverage independent method to analyze large scale anisotropies
Pierre Billoir, Antoine Letessier-Selvon
The arrival time distribution of cosmic ray events is well suited to extract information regarding sky anisotropies. For an experiment with nearly constant exposure, the frequency…
Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with H.E.S.S. and broadband characterisation
H. E. S. S. Collaboration, :, F. Aharonian
The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System (H.E.S.S.) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a live time of 43 hours. VH…
Discovery of two candidate pulsar wind nebulae in very-high-energy gamma rays
H. E. S. S. Collaboration, :, F. Aharonian
We present the discovery of two very-high-energy gamma-ray sources in an ongoing systematic search for emission above 100 GeV from pulsar wind nebulae in survey data from the H.E.S…
Is there Evidence for a Hubble bubble? The Nature of Type Ia Supernova Colors and Dust in External Galaxies
A. Conley, R. G. Carlberg, J. Guy +4
We examine recent evidence from the luminosity-redshift relation of Type Ia Supernovae (SNe Ia) for the detection of a ``Hubble bubble'' -- a departure of the local valu…
Discovery of a point-like very-high-energy gamma-ray source in Monoceros
F. Aharonian
The complex Monoceros Loop SNR/Rosette Nebula region contains several potential sources of very-high-energy (VHE) gamma-ray emission and two as yet unidentified high-energy EGRET s…
Quantification of discreteness effects in cosmological N-body simulations: II. Evolution up to shell crossing
Michael Joyce, Bruno Marcos
We apply a recently developed perturbative formalism which describes the evolution under their self-gravity of particles displaced from a perfect lattice to quantify precisely, up…
Spectroscopic observations of eight supernovae at intermediate redshift
C. Balland, M. Mouchet, R. Amanullah +16
We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate r…
Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study
G. Garavini, G. Folatelli, S. Nobili +44
We develop a method to measure the strength of the absorption features in Type Ia supernova (SN Ia) spectra and use it to make a quantitative comparison between the spectra of Type…
Detection of extended very-high-energy gamma-ray emission towards the young stellar cluster Westerlund 2
HESS Collaboration, F. Aharonian
Results from gamma-ray observations by the H.E.S.S. telescope array in the direction of the young stellar cluster Westerlund 2 are presented. Stereoscopic imaging of Cherenkov ligh…
ESC observations of SN 2005cf: II. Optical Spectroscopy and the high velocity features
G. Garavini, S. Nobili, S. Taubenberger +11
The ESC-RTN optical spectroscopy data-set for SN 2005cf is presented and analyzed. The observations range from -11.6 and +77.3 days with respect to B-band maximum light. The evolut…
Search for Pulsed VHE Gamma-Ray Emission from Young Pulsars with H.E.S.S
The HESS Collaboration, F. Aharonian
We present the results of a search for pulsed very-high-energy (VHE) gamma-ray emission from young pulsars using data taken with the H.E.S.S. imaging atmospheric Cherenkov telescop…