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Bibliographical reference
Journal of Cosmology and Astroparticle Physics, Issue 02, article id. 008, pp. (2014).
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2
2014
Citations
136
Refereed citations
108
Description
We present the results of stereoscopic observations of the satellite
galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and
2013. With almost 160 hours of good-quality data, this is the deepest
observational campaign on any dwarf galaxy performed so far in the very
high energy range of the electromagnetic spectrum. We search this large
data sample for signals of dark matter particles in the mass range
between 100 GeV and 20 TeV. For this we use the full likelihood analysis
method, which provides optimal sensitivity to characteristic gamma-ray
spectral features, like those expected from dark matter annihilation or
decay. In particular, we focus our search on gamma-rays produced from
different final state Standard Model particles, annihilation with
internal bremsstrahlung, monochromatic lines and box-shaped signals. Our
results represent the most stringent constraints to the annihilation
cross-section or decay lifetime obtained from observations of satellite
galaxies, for masses above few hundred GeV. In particular, our strongest
limit (95% confidence level) corresponds to a ~ 500 GeV dark matter
particle annihilating into τ+τ‑, and
is of order langleσannvrangle simeq 1.2 ×
10‑24 cm3 s‑1 — a
factor ~ 40 above the langleσannvrangle simeq thermal
value.
Related projects
Particle Astrophysics
The members of the Particle Astrophysics Group of the IAC participate actively in three large international collaborations of high-energy astrophysics: AMS-02 (Alpha Magnetic Spectrometer), the Cherenkov radiation telescopes MAGIC I and II and the Cherenkov Telescope Array Observatory ( CTAO). We also participate in the ASTRI mini-array, the gamma
Mónica Luisa
Vázquez Acosta