12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room D(109/110)

[DM016] Constraints to the dark matter lifetime with 250 hours of observations of the Perseus cluster with the MAGIC telescopes

Speakers

  • Joaquim PALACIO

Primary authors

Co-authors

Description

WIMPs are hypothetical elementary particles that interact weakly, with mass in the GeV-TeV range. WIMPs would constitute all or a part of dark matter and arise naturally in different theories beyond the Standard Model. The MAGIC telescopes are sensitive to gamma rays that would be produced in the annihilation or decay of WIMPs into Standard Model particles. Such emission is expected (and potentially observable) from nearby dark matter over-densities, such as the Galactic Center, dwarf spheroidal satellite galaxies or galaxy clusters. In recent years, MAGIC has conducted an extensive observational campaign in search of dark matter signals from these objects. Given the high level of uncertainty in the dark matter abundance and concentration in these sites, diversification of the observational targets is the optimal strategy for maximizing the chances of discovery. In this talk we present the results on 250 hours of MAGIC observations of the Perseus galaxy cluster, the deepest observational campaign on any galaxy cluster performed so far in the very high energy range of the electromagnetic spectrum. The analysis of the Perseus region is challenging, first because its dark matter induced gamma-ray emission is expected to be very extended. Moreover, NGC1275 and IC310 are known gamma-ray emitters in the Perseus cluster whose large flux variability needs a dedicated treatment in the analysis. We apply a likelihood analysis optimized for the spectral and morphological features expected in the dark matter decay signals and search for dark matter signatures in the mass range between 100 GeV and 20 TeV. Among other results, we are able to constrain decay lifetimes into quark-antiquark at a level of 10^26 s for dark matter masses of 10 TeV. This result is almost one order of magnitude stronger than previous MAGIC results and the most constraining limits currently known.