“Positrons in Astrophysics” Mürren , Switzerland 20-23 March 2012

1. “Positrons in Astrophysics”Mürren, Switzerland20-23 March 2012 Organization Goal Session 1 - Direct Detection of Cosmic-Ray Positrons Session 2 - Positron and Positronium Scattering Session 3 - Astrophysical Sources of Galactic Positrons Session 4 - Other Aspects of Positron-matter Interactions Session 5 - Low-Energy Positron-Matter Interactions Session 6 - Antimatter in Cosmic Rays Session 7 - Antihydrogen Session 8 - Annihilation Detection Session 9 - Galactic e-e+ Annihilation Session 10 - Antimatter from Dark or Domestic Matter Session 11 - Positron and Positronium Interactions with Solids Session 12 - Terrestrial and Extraterrestrial Positrons Session 13 - Baryon Asymmetry Session 14 - Future instruments for Observing e-e+ Radiation

4. Session 1 - Direct Detection of Cosmic-Ray Positrons MirkoBoezio, INFN Trieste “A Challenging Puzzle for Cosmic Ray Physics” WaritMitthumsiri SLAC Pamela/Fermi-LAT

5. Session 2 - Positron and Positronium Scattering Michael Charlton, Swansea University

7. Positron Physics

8. Session 3 - Astrophysical Sources of Galactic Positrons Astrophysical sources of Galactic positrons - Nikos Prantzos Positron generation in the magnetospheres of neutron stars - Ya.N. Istomin Wide-Band Spectra of Magnetar Persistent and Burst Emission - Y.E. Nakagawa Electron-positron plasmas in large-scale cosmic structures: origin, evolution and interaction - Sergio Colafrancesco Session 9 - Galactic e-e+ Annihilation Observation of Galactic e-e+ Annihilation Radiation - Roland Diehl Can positrons from Sgr A* produce the 511 keV emission in the galactic bulge? - Pierre Jean The INTEGRAL search for 511 keV emission line from Galactic X-ray binaries - Giovanni De Cesare The 511 keV sky as seen by INTEGRAL/SPI, CGRO-OSSE and GRS/SMM combined - Gerry Skinner Session 10 - Antimatter from Dark or Domestic Matter Positrons and antiprotons from dark matter - Pierre Salati Interacting dark matter contribution to the Gal. 511 keV gamma ray signal: constraining the morphology of SPI observations - A. Vincent A local contribution to the Galactic 511 keV annihilation radiation - NidhalGuessoum Astrophysical Sources of Galactic Positrons Prantzos et al. (2011)

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10. Prantzos

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12. One of the surprises was that the ‘bulge’ emission from around the centre of the galaxy is surprisingly strong INTEGRAL / SPI : 2002 - ….SMM / GRS 1980 – 1989CGRO / OSSE : 1991-1999 Offset of the outer bulge component by about 1.4° towards negative galactic longitude Skinner

14. Bulge Positrons Type 1A Pulsars Cosmic Rays LMXBs LDM Propagation von Ballmoos

15. Weidenspointer et al. (2008)

16. Bulge Positrons Type 1A Pulsars Cosmic Rays LMXBs LDM Propagation Prantzos

17. We find that: – The data seem to imply the existence of an additional component, which is shifted by 1‐2 degrees toward the negative longitudes, but of a symmetric shape (similar to Bouchet et al. 2010 and Skinner et al. 2010). – There seems to be some additional effect between ‐15 and ‐25 deg, with a thickness of a few degrees, but this does not quite seem to resemble Sco‐Cen. – Perhaps an irradiation of nearby (“local”) molecular clouds by Sco‐Cen’s positrons?... A simple modeling of Sco‐Cen, either replacing the outer bulge or even added to it, is not supported by the SPI data, which is not rich and detailed enough to allow for such specific probe. Guessoum

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