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Search for Gamma-Ray Emission from DES Dwarf Spheroidal Galaxy Candidates with Fermi-LAT Data

Journal Article · · Astrophys.J.Lett.
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  1. Fermilab
  2. Stanford U., HEPL; KIPAC, Menlo Park; Stanford U., Phys. Dept.
  3. Chicago U., KICP
  4. Texas A-M
  5. Stockholm U., OKC; Stockholm U.
  6. INFN, Pisa
  7. SUNY, Stony Brook
  8. U. Montpellier 2, LUPM
  9. Stockholm U.
  10. UC, Santa Cruz
  11. INFN, Perugia; Perugia U.
  12. INFN, Trieste; Udine U.
  13. Bari U.; INFN, Bari
  14. INFN, Bari
  15. NASA, Goddard
  16. Gottingen U.
  17. Hiroshima U.
  18. INFN, Rome
  19. INFN, Trieste
  20. Purdue U.
  21. INFN, Trieste; Nova Gorica U.
  22. Stockholm U.; Stockholm U., OKC
  23. Cerro-Tololo InterAmerican Obs.
  24. Fermilab; Baltimore, Space Telescope Sci.
  25. Surrey U.; Rio de Janeiro Observ.
  26. Barcelona, IEEC
  27. University Coll. London
  28. Carnegie Inst. Observ.
  29. Pennsylvania U.
  30. Paris, Inst. Astrophys.
  31. SLAC
  32. Rio de Janeiro Observ.
  33. Illinois U., Urbana
  34. Portsmouth U., ICG
  35. LIneA, Rio de Janeiro; Rio de Janeiro Observ.
  36. Munich U.; Munich, Tech. U., Universe
  37. Stanford U., Phys. Dept.
  38. Pennsylvania U.; Caltech
  39. Michigan U.
  40. Barcelona, IFAE
  41. Fermilab; Chicago U., KICP
  42. Garching, Max Planck Inst., MPE; Munich U. Observ.
  43. Ohio State U.; Ohio State U., CCAPP
  44. Rio Grande do Sul U.; Rio de Janeiro Observ.
  45. Rio de Janeiro, CBPF
  46. Ohio State U., CCAPP; Ohio State U., Dept. Astron.
  47. Munich U.; Munich, Tech. U., Universe; Garching, Max Planck Inst., MPE
  48. Brookhaven; Caltech
  49. Sussex U.
  50. Stanford U., Phys. Dept.; SLAC
  51. Madrid, CIEMAT
  52. Madrid, CIEMAT; Illinois U., Urbana
  53. Fermilab; Rio de Janeiro Observ.
  54. Ohio State U., CCAPP; Ohio State U.
  55. Stanford U., Phys. Dept.; Stanford U.; SLAC
  56. Manchester U.
  57. Australian Astron. Observ.; Argonne
+ Show Author Affiliations

Due to their proximity, high dark-matter (DM) content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection of DM. Recently, eight new dSph candidates were discovered using the first year of data from the Dark Energy Survey (DES). We searched for gamma-ray emission coincident with the positions of these new objects in six years of Fermi Large Area Telescope data. We found no significant excesses of gamma-ray emission. Under the assumption that the DES candidates are dSphs with DM halo properties similar to the known dSphs, we computed individual and combined limits on the velocity-averaged DM annihilation cross section for these new targets. If the estimated DM content of these dSph candidates is confirmed, they will constrain the annihilation cross section to lie below the thermal relic cross section for DM particles with masses $$\lesssim 20\,\mathrm{GeV}$$ annihilating via the $$b\bar{b}$$ or τ(+)τ(−) channels.

Research Organization:
Munich U. Observ.; Portsmouth U., ICG; Illinois U., Urbana; Ohio State U., Dept. Astron.; Bari U.; Ohio State U.; NASA, Goddard; Stockholm U.; Brookhaven National Laboratory (BNL), Upton, NY (United States); LIneA, Rio de Janeiro; Manchester U.; Stockholm U., OKC; Gottingen U.; Paris, Inst. Astrophys.; Barcelona, IFAE; Baltimore, Space Telescope Sci.; INFN, Bari; Ohio State U., CCAPP; Stanford U., Phys. Dept.; Stanford U., HEPL; Stanford U.; Texas A-M; Purdue U.; Perugia U.; INFN, Trieste; Madrid, CIEMAT; Udine U.; Argonne National Laboratory (ANL), Argonne, IL (United States); Cerro-Tololo InterAmerican Obs.; Rio de Janeiro Observ.; Nova Gorica U.; SUNY, Stony Brook; Barcelona, IEEC; UC, Santa Cruz; Australian Astron. Observ.; Chicago U., KICP; Garching, Max Planck Inst., MPE; Hiroshima U.; Surrey U.; Pennsylvania U.; Sussex U.; INFN, Rome; Caltech; INFN, Perugia; Rio Grande do Sul U.; INFN, Pisa; Michigan U.; Munich U.; Carnegie Inst. Observ.; Munich, Tech. U., Universe; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Rio de Janeiro, CBPF; U. Montpellier 2, LUPM; University Coll. London
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1252998
Alternate ID(s):
OSTI ID: 1354924
OSTI ID: 22877632
Report Number(s):
FERMILAB-PUB-15-082-AE; oai:inspirehep.net:1351191; arXiv:1503.02632
Journal Information:
Astrophys.J.Lett., Journal Name: Astrophys.J.Lett. Journal Issue: 1 Vol. 809
Country of Publication:
United States
Language:
English

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