Browsing by Author "Guglielmetti, F."

Now showing items 1-3 of 3

    • Gamma-ray spectroscopy of positron annihilation in the Milky Way 

      Siegert, T.; Diehl, R.; Khachatryan, G.; Krause, M.~G.~H.; Guglielmetti, F.; Greiner, J.; Strong, A.~W.; Zhang, X. (2016-02-01)
      Context. The annihilation of positrons in the Galaxy's interstellar medium produces characteristic gamma-rays with a line at 511 keV. This gamma-ray emission has been observed with the spectrometer SPI on ESA's INTEGRAL ...

    • Positron annihilation signatures associated with the outburst of the microquasar V404 Cygni 

      Siegert, T.; Diehl, R.; Greiner, J.; Krause, M.~G.~H.; Beloborodov, A.~M.; Bel, M.~C.; Guglielmetti, F.; Rodriguez, J.; Strong, A.~W.; Zhang, X. (2016-03-17)
      Microquasars1, 2, 3, 4 are stellar-mass black holes accreting matter from a companion star5 and ejecting plasma jets at almost the speed of light. They are analogues of quasars that contain supermassive black holes of 106 ...

    • Search for 511 keV Emission in Satellite Galaxies of the Milky Way with INTEGRAL/SPI 

      Siegert, T.; Diehl, R.; Vincent, A.~C.; Guglielmetti, F.; Krause, M.~G.~H.; Boehm, C. (2016-10-24)
      The positron annihilation gamma-ray signal in the Milky Way (MW) shows a puzzling morphology: a very bright bulge and a very low surface-brightness disk. A coherent explanation of the positron origin, propagation through ...