First IACT observations of dwarf irregular galaxy WLM find no gamma-ray excess and set 95% CL upper limits on dark matter annihilation cross section, reaching about 10^-21 cm^3/s for the tau+tau- channel at 1 TeV.
Searching for TeV DM evidence from Dwarf Irregular Galaxies with the HAWC Observatory
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abstract
The dynamics of dwarf irregular (dIrr) galaxies are observed to be dominated by dark matter (DM). Recently, the DM density distribution has been studied for 31 dIrrs. Their extended DM halo (Burket type profile) makes these objects good candidates for DM searches. Located in Puebla (Mexico), the High Altitude Water Cherenkov (HAWC) Observatory is an optimal in- strument to perform such DM searches, because of its large sky coverage (8.4 sr per day). We analyzed a set of two years of HAWC data and we found no significant DM signal from dIrr galaxies. We present the upper limits for DM annihilation cross-section with dIrr galaxies.
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Dark Matter searches towards the WLM dwarf irregular galaxy with H.E.S.S
First IACT observations of dwarf irregular galaxy WLM find no gamma-ray excess and set 95% CL upper limits on dark matter annihilation cross section, reaching about 10^-21 cm^3/s for the tau+tau- channel at 1 TeV.