2020/05/31 by Arpan Kar, Biswarup Mukhopadhyaya, Steven Tingay +6
Physics and Astronomy · #Annihilation #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Dark matter #Galaxy #Gamma-ray bursts and supernovae #Magnetic field #Radio telescope #Synchrotron #Telescope #X-shaped radio galaxy #astro-ph.HE #hep-ph
paper · pdf · doi:10.1016/j.dark.2020.100689
Accepted in Physics of the Dark Universe, 7 pages, 4 figures, 1 table
openalex publication_date 2020/07/16 · arxiv created 2020/07/17 · arxiv updated 2020/07/20 · openalex created_date 2020/07/23 · openalex updated_date 2026/08/05
We present an analysis of Murchison Widefield Array radio telescope data from ω Cen, possibly a stripped dwarf spheroidal galaxy core captured by our Galaxy. Recent interpretations of Fermi-LAT γ-ray data by Brown \it et al. (2019) and Reynoso-Cordova \it et al. (2019) suggest that ω Cen may contain significant Dark Matter. We utilise their best-fit Dark Matter annihilation models, and an estimate of the magnetic field strength in ω 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.