- Physical Review Journals
All JournalsPhysics Magazine
Access Provided by Xinjiang University

Physical Review D

Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

Positrons from particle dark-matter annihilation in the Galactic halo: Propagation Green’s functions

Igor V. Moskalenko* and Andrew W. Strong†

  • Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, D-85740 Garching, Germany

  • *Also at D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University, 119 899 Moscow, Russia; Email address: imos@mpe.mpg.de
  • †Email address: aws@mpe.mpg.de
PDF

Phys. Rev. D 60, 063003 – Published 24 August, 1999

DOI: https://doi.org/10.1103/PhysRevD.60.063003

Abstract

We calculate the propagation of positrons from dark-matter particle annihilation in the Galactic halo in different models of the dark matter halo distribution using our three-dimensional code, and present fits to our numerical propagation Green’s functions. We show that the Green’s functions are not very sensitive to the dark matter distribution for the same local dark matter energy density. We compare our predictions with the computed cosmic ray positron spectra (“background”) for the “conventional” cosmic ray nucleon spectrum which matches the local measurements, and a modified spectrum which respects the limits imposed by measurements of diffuse Galactic γ rays, antiprotons, and positrons. We conclude that significant detection of a dark matter signal requires favorable conditions and precise measurements unless the dark matter is clumpy which would produce a stronger signal. Although our conclusion qualitatively agrees with those of previous authors, it is based on a more realistic model of particle propagation and thus reduces the scope for future speculations. A reliable background evaluation requires new accurate positron measurements and further developments in modeling production and propagation of cosmic ray species in the Galaxy.

View figure in article

References (28)

  1. V. Trimble, Annu. Rev. Astron. Astrophys. 25, 425 (1989); K. M. Ashman, Proc. Astro. Soc. Pac. 104, 1109 (1992).
  2. G. Jungman, M. Kamionkowski, and K. Griest, Phys. Rep. 267, 195 (1996).
  3. J. Silk and M. Srednicki, Phys. Rev. Lett. 53, 624 (1984); S. Rudaz and F. Stecker, Astrophys. J. 325, 16 (1988); ibid.F. Stecker and A. Tylka, 336, L51 (1989); J. Ellis et al., Phys. Lett. B 214, 403 (1989).
  4. See, e.g., G. Jungman and M. Kamionkowski, Phys. Rev. D 49, 2316 (1994); P. Chardonnet, G. Mignola, P. Salati, and R. Taillet, Phys. Lett. B 384, 161 (1996); A. Bottino, F. Donato, N. Fornengo, and P. Salati, Phys. Rev. D 58, 123503 (1998); L. Bergström, J. Edsjö, and P. Ullio, astro-ph/9902012; see also Ref. [2], and references therein.
  5. A. J. Tylka, Phys. Rev. Lett. 63, 840 (1989); M. S. Turner and F. Wilczek, Phys. Rev. D 42, 1001 (1990).
  6. M. Kamionkowski and M. S. Turner, Phys. Rev. D 43, 1774 (1991).
  7. See, e.g., H.-U. Bengtsson et al., Nucl. Phys. B346, 129 (1990); S. Rudaz and F. Stecker, Astrophys. J. 368, 406 (1991); V. Berezinsky et al., Phys. Lett. B 325, 136 (1994); P. Chardonnet et al., Astrophys. J. 454, 774 (1995); see also Ref. [2], and references therein.
  8. E. A. Baltz and J. Edsjö, Phys. Rev. D 59, 023511 (1998).
  9. CAPRICE Collaboration, G. Barbiellini et al., in Proceedings of the 25th International Cosmic Ray Conference, Durban; PAMELA Collaboration, O. Adriani et al., ibid., Vol. 5, p. 49.
  10. A. W. Strong and I. V. Moskalenko, Astrophys. J. 509, 212 (1998).
  11. I. V. Moskalenko and A. W. Strong, Astrophys. J. 493, 694 (1998).
  12. A. W. Strong, I. V. Moskalenko, and O. Reimer, astro-ph/9811296.
  13. A. W. Strong and I. V. Moskalenko, in Topics in Cosmic Ray Astrophysics, edited by M. A. DuVernois (Nova Scientific, New York, 1999), astro-ph/9812260; in Proceedings of the Workshop “LiBeB, Cosmic Rays and Gamma-Ray Line Astronomy,” edited by R. Ramaty et al., ASP Conf. Ser. 171 (Astronomical Society of the Pacific, San Francisco, 1999), p. 162.
  14. I. V. Moskalenko, A. W. Strong, and O. Reimer, Astron. Astrophys. 338, L75 (1998).
  15. I. V. Moskalenko and A. W. Strong, Astrophys. J. (to be published), astro-ph/9811284.
  16. W. H. Press et al., Numerical Recipes in FORTRAN, 2nd ed. (Cambridge University Press, Cambridge, England, 1992).
  17. V. S.Berezinskii et al., Astrophysics of Cosmic Rays (North- Holland, Amsterdam, 1990); E. S. Seo and V. S. Ptuskin, Astrophys. J. 431, 705 (1994).
  18. A. W. Strong and J. R. Mattox, Astron. Astrophys. 308, L21 (1996).
  19. M. Kamionkowski and A. Kinkhabwala, Phys. Rev. D 57, 3256 (1998).
  20. J. Ellis, talk at the Nobel Symposium, Sweden, astro-ph/9812211.
  21. K. Griest and D. Seckel, Phys. Rev. D 43, 3191 (1991).
  22. HEAT Collaboration, S. W. Barwick et al., Astrophys. J. 498, 779 (1998).
  23. S. D. Hunter et al., Astrophys. J. 481, 205 (1997).
  24. P. Gralewicz et al., Astron. Astrophys. 318, 925 (1997); M. Mori, Astrophys. J. 478, 225 (1997).
  25. T. A. Porter and R. J. Protheroe, J. Phys. G 23, 1765 (1997).
  26. M. Pohl and J. A. Esposito, Astrophys. J. 507, 327 (1998).
  27. S. Coutu et al., Astropart. Phys. (to be published), astro-ph/9902162.
  28. See, e.g., J. Silk and A. Stebbins, Astrophys. J. 411, 439 (1993); L. Bergström, J. Edsjö, P. Gondolo, and P. Ullio, Phys. Rev. D 59, 043506 (1999).

Outline

Information

Phys. Rev. D 60, 063003– Published 24 August, 1999
  • Received 9 March 1999

© 1999 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation