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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Research Topics

 

  • Pulsed Gamma-ray Emission


    Pulsars are highly magnetized and rapidly rotating neutron stars which emit a beam of high energetic gamma radiation. Due to the rotating beam of light a regular pulsed signal with periods ranging from 1.4 ms to 8.5 s is observed on earth (lighthouse effect). The actual mechanisms of radiation emission is still poorly known and subject of ongoing investigation.
    GammaRayBurst
  • TeV Gamma-ray Binaries

      
    Of particular interest are binary systems such as PSR 1259-63, a highly eccentric binary system of a pulsar and a high mass Be companion star. From those systems the pulsar wind interaction with its surroundings as well as the jets physics can be studied. BinaryPlerion
  • Dark Matter Annihilation

The annihilation of dark matter (DM) particles is assumed to result in secondary particles (photons, neutrinos, positrons) whose energy spectrum ends at the mass of the DM particle and might show characteristic features (e.g. annihilitation lines). Detection of such secondary particles facilitates so called indirect DM searches. Such searches with H.E.S.S. have targeted dwarf galaxies (dim galaxis orbiting the Milky Way) and regions close to the Galactic Center both of which are believed to harbour increased concentrations of DM. 

  • Pulsar Wind Nebulae

Pulsar wind nebulae (PWNe) are luminous structures visible around pulsars. They are powered by the spin-down energy loss of the pulsar and have been detected at various energies (e.g. X-ray, high-energy).  PWNe form the largest known population of Galactic gamma-ray sources and it is assumed that many currently unidentified sources will be classified as PWNe. Observations with H.E.S.S. in combination with multiwavelength data help to understand the evolution and structure of PWN.

  • Supernova Remnants

      
    Supernova remnants (SNR) result from the explosions of stars in supernovae. Apart from heating up the interstellar medium they accelerate cosmic rays which is of particular interest since the acceleration mechanisms of extremly high energetic particles are still poorly known.

    SNR