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The annihilation of positrons in the Milky Way galaxy has been observed for $\sim 50$ years however the production sites of these positrons remains hard to identify.
The Spectrum of Low-Energy Gamma Radiation from the Galactic-Center Region
Johnson, III, W.N.; Harnden, Jr., F.R.; Haymes, R.C · 1972
Earlier work this paper cites.
On the origin of the galactic annihilation radiation
Aharonian, F.A.; Atoyan, A.M · 1981
Earlier work this paper cites.
The pair annihilation process in relativistic plasmas
Svensson, R · 1982
Earlier work this paper cites.
OSSE Mapping of Galactic 511 keV Positron Annihilation Line Emission
Purcell, W.R.; Cheng, L.X.; Dixon, D.D.; Kinzer, R.L.; Kurfess, J.D.; Leventhal, M.; Saunders, M.A.; Skibo, J.G.; Smith, D.M.; Tueller, J · 1997
Earlier work this paper cites.
Annihilation Fountain in the Galactic Center Region
Dermer, C.D.; Skibo, J.G · 1997
Earlier work this paper cites.
Positron Escape from Type IA Supernovae
Milne, P.A.; The, L.S.; Leising, M.D · 1999
Earlier work this paper cites.
Comparative studies of line and continuum positron annihilation radiation
Milne, P.A.; Kurfess, J.D.; Kinzer, R.L.; Leising, M.D · 2001
Earlier work this paper cites.
The Large-Scale Bipolar Wind in the Galactic Center
Bland-Hawthorn, J.; Cohen, M · 2003
Earlier work this paper cites.
The all-sky distribution of 511 keV electron-positron annihilation emission
Knödlseder, J.; Jean, P.; Lonjou, V.; Weidenspointner, G.; Guessoum, N.; Gillard, W.; Skinner, G.; von Ballmoos, P.; Vedrenne, G.; Roques, J.P.; Schanne, S.; Teegarden, B.; Schönfelder, V.; Winkler, C · 2005
Earlier work this paper cites.
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL
Churazov, E.; Sunyaev, R.; Sazonov, S.; Revnivtsev, M.; Varshalovich, D · 2005
Earlier work this paper cites.
Spectral analysis of the Galactic e +
Jean, P.; Knödlseder, J.; Gillard, W.; Guessoum, N.; Ferrière, K.; Marcowith, A.; Lonjou, V.; Roques, J.P · 2006
Earlier work this paper cites.
Stringent Constraint on Galactic Positron Production
Beacom, J.F.; Yüksel, H · 2006
Earlier work this paper cites.
Microquasars as sources of positron annihilation radiation
Guessoum, N.; Jean, P.; Prantzos, N · 2006
Cited alongside, same era.
On the intensity and spatial morphology of the 511 keV emission in the Milky Way
Prantzos, N · 2006
Cited alongside, same era.
Annihilation Emission from the Galactic Black Hole
Cheng, K.S.; Chernyshov, D.O.; Dogiel, V.A · 2006
Cited alongside, same era.
A RIAF Interpretation for the Past Higher Activity of the Galactic Center Black Hole and the 511 keV Annihilation Emission
Totani, T · 2006
Cited alongside, same era.
An asymmetric distribution of positrons in the Galactic disk revealed by γ \gamma -rays
Weidenspointner, G.; Skinner, G.; Jean, P.; Knödlseder, J.; von Ballmoos, P.; Bignami, G.; Diehl, R.; Strong, A.W.; Cordier, B.; Schanne, S.; Winkler, C · 2008
Cited alongside, same era.
Calculations of the Galactic Population of Black Hole X-Ray Binaries
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL revisited: annihilation in a cooling ISM?
Churazov, E.; Sazonov, S.; Tsygankov, S.; Sunyaev, R.; Varshalovich, D · 2011
Later among the works it cites.
Diffuse Emission Measurement with the SPectrometer on INTEGRAL as an Indirect Probe of Cosmic-Ray Electrons and Positrons
Bouchet, L.; Strong, A.W.; Porter, T.A.; Moskalenko, I.V.; Jourdain, E.; Roques, J.P · 2011
Later among the works it cites.
The 511 keV emission from positron annihilation in the Galaxy
Prantzos, N.; Boehm, C.; Bykov, A.M.; Diehl, R.; Ferrière, K.; Guessoum, N.; Jean, P.; Knoedlseder, J.; Marcowith, A.; Moskalenko, I.V.; Strong, A.; Weidenspointner, G · 2011
Later among the works it cites.
Fermi Bubbles: Giant, Multibillion-Year-Old Reservoirs of Galactic Center Cosmic Rays
Crocker, R.M.; Aharonian, F · 2011
Later among the works it cites.
Galactic annihilation emission from nucleosynthesis positrons
Martin, P.; Strong, A.W.; Jean, P.; Alexis, A.; Diehl, R · 2012
Later among the works it cites.
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Sadowski, A.; Ziółkowski, J.; Belczyński, K.; Bulik, T · 2008
Cited alongside, same era.
The underluminous Type Ia supernova 2005bl and the class of objects similar to SN 1991bg
Taubenberger, S.; Hachinger, S.; Pignata, G.; Mazzali, P.A.; Contreras, C.; Valenti, S.; Pastorello, A.; Elias-Rosa, N.; Bärnbantner, O.; Barwig, H.; Benetti, S.; Dolci, M.; Fliri, J.; Folatelli, G.; Freedman, W.L.; Gonzalez, S.; Hamuy, M.; Krzeminski, W.; Morrell, N.; Navasardyan, H.; Persson, S.E.; Phillips, M.M.; Ries, C.; Roth, M.; Suntzeff, N.B.; Turatto, M.; Hillebrandt, W · 2008
Cited alongside, same era.
The Galactic Positron Annihilation Radiation and the Propagation of Positrons in the Interstellar Medium
Higdon, J.C.; Lingenfelter, R.E.; Rothschild, R.E · 2009
Cited alongside, same era.
Positron transport in the interstellar medium
Jean, P.; Gillard, W.; Marcowith, A.; Ferrière, K · 2009
Cited alongside, same era.
The Galactic positron annihilation radiation: an update based on recent SPI observations
Skinner, G.; Jean, P.; Knödlseder, J.; Martin, P.; von Ballmoos, P.; Weidenspointer, G · 2010
Cited alongside, same era.
Giant Gamma-ray Bubbles from Fermi-LAT: Active Galactic Nucleus Activity or Bipolar Galactic Wind?
Su, M.; Slatyer, T.R.; Finkbeiner, D.P · 2010
Cited alongside, same era.
Monte Carlo modelling of the propagation and annihilation of nucleosynthesis positrons in the Galaxy
Alexis, A.; Jean, P.; Martin, P.; Ferrière, K · 2014
Later among the works it cites.
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
Later among the works it cites.
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
Later among the works it cites.
Diffuse Galactic antimatter from faint thermonuclear supernovae in old stellar populations 2017
Crocker, R.M.; Ruiter, A.J.; Seitenzahl, I.R.; Panther, F.H.; Sim, S.; Baumgardt, H.; Möller, A.; Nataf, D.M.; Ferrario, L.; Eldridge, J.J.; White, M.; Tucker, B.E.; Aharonian, F · 2017
Later among the works it cites.
Galactic Binaries Can Explain the Fermi Galactic Center Excess and 511 keV Emission
Bartels, R.; Calore, F.; Storm, E.; Weniger, C · 2018
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Positron annihilation in the nuclear outflows of the Milky Way
Panther, F.H.; Crocker, R.M.; Birnboim, Y.; Seitenzahl, I.R.; Ruiter, A.J · 2018
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