Dark matter annihilation in $\omega$ Centauri: Astrophysical implications derived from the MWA radio data

Abstract

We present an analysis of Murchison Widefield Array radio telescope data from $\omega$ Cen, possibly a stripped dwarf spheroidal galaxy core captured by our Galaxy. Recent interpretations of Fermi-LAT $\gamma$-ray data by Brown {\it et al.} (2019) and Reynoso-Cordova {\it et al.} (2019) suggest that $\omega$ Cen may contain significant Dark Matter. We utilise their best-fit Dark Matter annihilation models, and an estimate of the magnetic field strength in $\omega$ Cen, to calculate the expected radio synchrotron signal from annihilation, and show that one can usefully rule out significant parts of the magnetic field - diffusion coefficient plane using our current observational limits on the radio emission. Improvement by a factor of 10-100 on these limits could constrain the models even more tightly.

Accepted in Physics of the Dark Universe, 7 pages, 4 figures, 1 table

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Cited by in corpus (3)

• Universal profiles for radio searches of dark matter in dwarf galaxies
• Constraints on dark matter annihilation from the FAST observation of the Coma Berenices dwarf galaxy
• SKA sensitivity for possible radio emission from dark matter in Omega Centauri