No gamma-ray excess was found toward 31 dwarf irregular galaxies with HAWC, yielding 95% confidence upper limits on dark matter annihilation cross-sections and decay lifetimes in the 1 to 100 TeV mass range.
H.E.S.S. observations of massive stellar clusters
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abstract
Stellar clusters are potential acceleration sites of very-high-energy (VHE, E > 100GeV) particles since they host supernova remnants (SNRs) and pulsar wind nebulae (PWNe). Additionally, in stellar clusters, particles can also be accelerated e.g. at the boundaries of wind-blown bubbles, in colliding wind zones in massive binary systems or in the framework of collective wind or wind/supernova(SN) ejecta scenarios. Motivated by the detection of VHE gamma-ray emission towards Westerlund 2 and assuming similar particle acceleration mechanisms at work, Westerlund 1 is an even more promising target for VHE gamma-ray observations given that massive star content and distance are more favorable for detectable VHE gamma-ray emission compared to Westerlund 2. Here, H.E.S.S. observations of massive stellar clusters in general with special emphasis on the most massive stellar cluster in the galaxy, Westerlund 1 are summarized.
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Constraints on cross-section and lifetime of dark matter with HAWC Observations of dwarf Irregular galaxies
No gamma-ray excess was found toward 31 dwarf irregular galaxies with HAWC, yielding 95% confidence upper limits on dark matter annihilation cross-sections and decay lifetimes in the 1 to 100 TeV mass range.