DARK MATTER ANNIHILATION and DECAY PROFILES for the RETICULUM II DWARF SPHEROIDAL GALAXY

Vincent Bonnivard, Céline Combet, David Maurin, Alex Geringer-Sameth, Savvas M. Koushiappas, Matthew G. Walker, Mario Mateo, Edward W. Olszewski, John I. Bailey

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The dwarf spheroidal galaxies (dSph) of the Milky Way are among the most attractive targets for indirect searches of dark matter (DM). In this work, we reconstruct the DM annihilation (J-factor) and decay profiles for the newly discovered dSph Reticulum II. Using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System, we find Reticulum II's J-factor to be among the largest of any Milky Way dSph. We have checked the robustness of this result against several ingredients of the analysis. Unless it suffers from tidal disruption or significant inflation of its velocity dispersion from binary stars, Reticulum II may provide a unique window on DM particle properties.

Original languageEnglish (US)
Article numberL36
JournalAstrophysical Journal Letters
Volume808
Issue number2
DOIs
StatePublished - Aug 1 2015

Keywords

  • dark matter
  • galaxies: dwarf
  • galaxies: individual (Reticulum II)
  • gamma rays: galaxies
  • methods: statistical
  • stars: kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Bonnivard, V., Combet, C., Maurin, D., Geringer-Sameth, A., Koushiappas, S. M., Walker, M. G., Mateo, M., Olszewski, E. W., & Bailey, J. I. (2015). DARK MATTER ANNIHILATION and DECAY PROFILES for the RETICULUM II DWARF SPHEROIDAL GALAXY. Astrophysical Journal Letters, 808(2), [L36]. https://doi.org/10.1088/2041-8205/808/2/L36