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A low level of extragalactic background light as revealed by γ-rays from blazars
The diffuse extragalactic background light consists of the sum of the starlight emitted by galaxies through the history of the Universe, and it could also have an important contribution from the…
The H.E.S.S. Survey of the Inner Galaxy in Very High Energy Gamma Rays
The distribution in Galactic latitude of the detected sources appears to be consistent with a scale height in the Galactic disk for the parent population smaller than 100 pc, consistent with expectations for supernova remnants and/or pulsar wind nebulae.
Discovery of very-high-energy γ-rays from the Galactic Centre ridge
The source of Galactic cosmic rays (with energies up to 1015 eV) remains unclear, although it is widely believed that they originate in the shock waves of expanding supernova remnants. At present the…
A New Population of Very High Energy Gamma-Ray Sources in the Milky Way
A first sensitive survey of the inner part of the Milky Way with the High Energy Stereoscopic System (HESS) reveals a population of eight previously unknown firmly detected sources of very high energy γ-rays.
Energy spectrum of cosmic-ray electrons at TeV energies.
- F. Aharonian, A. Akhperjanian, +152 authors A. Zech
- Physics, MedicinePhysical review letters
- 24 November 2008
In this measurement, the first of this type, the High Energy Stereoscopic System is able to extend the measurement of the electron spectrum beyond the range accessible to direct measurements, finding evidence for a substantial steepening in the energy spectrum above 600 GeV compared to lower energies.
Intraday Variability in Quasars and BL LAC Objects
Active galactic nuclei with flat radio spectra exhibit significant variations of continuum flux density on time scales of days or less throughout the entire wavelength range. These rapid variations…
Fast Variability of TeraElectron Volt γ Rays from the Radio Galaxy M87
The observations confirm that TeV γ rays are emitted by extragalactic sources other than blazars, where jets are not relativistically beamed toward the observer.
A detailed spectral and morphological study of the gamma-ray supernova remnant RX J1713.7-3946 with HESS
No decisive conclusions can yet be drawn regarding the parent particle population dominantly responsible for the gamma-ray emission from RX J1713.7-3946, but the emission is found to resemble a shell structure with increased fluxes from the western and northwestern parts.
Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary
Evidence for gamma-ray emission of >100 gigaelectron volts from a candidate microquasar, LS 5039, is found, showing that particles are also accelerated to very high energies in these systems.
The DENIS Point Source Catalogue towards the Magellanic Clouds
We have compiled the near infrared Point Source Catalogue (PSC) towards the Magellanic Clouds (MCs) extracted from the data obtained with the Deep Near Infrared Survey of the Southern Sky - DENIS…