Dark matter in the Reticulum II dSph: a radio search
- Dipartimento di Fisica, Università di Torino, via P. Giuria 1, 10125 Torino (Italy)
- SKA South Africa, 3rd Floor, The Park, Park Road, Pinelands, 7405 (South Africa)
- School of Physics, University of the Witwatersrand, Johannesburg (South Africa)
We present a deep radio search in the Reticulum II dwarf spheroidal (dSph) galaxy performed with the Australia Telescope Compact Array. Observations were conducted at 16 cm wavelength, with an rms sensitivity of 0.01 mJy/beam, and with the goal of searching for synchrotron emission induced by annihilation or decay of weakly interacting massive particles (WIMPs). Data were complemented with observations on large angular scales taken with the KAT-7 telescope. We find no evidence for a diffuse emission from the dSph and we derive competitive bounds on the WIMP properties. In addition, we detect more than 200 new background radio sources. Among them, we show there are two compelling candidates for being the radio counterpart of the possible γ-ray emission reported by other groups using Fermi-LAT data.
- OSTI ID:
- 22676105
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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