1. Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope ArrayMiltiadis Michailidis, Lorenzo Marafatto, Denys Malyshev, Fabio Iocco, Gabrijela Zaharijas, Olga Sergijenko, Maria Isabel Bernardos, Christopher Eckner, Alexey Boyarsky, Anastasia Sokolenko, Andrea Santangelo, 2023, izvirni znanstveni članek Opis: Abstract
M31 and M33 are the closest spiral galaxies and the largest members (together with the Milky Way) of the Local group, which makes them interesting targets for indirect dark matter searches. In this paper we present studies of the expected sensitivity of the Cherenkov Telescope Array (CTA) to an annihilation signal from weakly interacting massive particles from M31 and M33. We show that a 100 h long observation campaign will allow CTA to probe annihilation cross-sections up to 〈συ〉 ≈ 5·10-25 cm3 s-1 for the τ
+
τ
- annihilation channel (for M31, at a DM mass of 0.3 TeV), improving the current limits derived by HAWC by up to an order of magnitude.
We present an estimate of the expected CTA sensitivity, by also taking into account the contributions of the astrophysical background and other possible sources of systematic uncertainty.
We also show that CTA might be able to detect the extended emission from the bulge of M31, detected at lower energies by the Fermi/LAT. Ključne besede: dark matter, gamma rays, Cherenkov Telescope Array, i Objavljeno v RUNG: 13.01.2025; Ogledov: 284; Prenosov: 10
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2. Probing dark matter and fundamental physics with the Cherenkov Telescope ArrayFabio Iocco, Manuel Meyer, M. Doro, Werner Hofmann, Judit Pérez Romero, Gabrijela Zaharijas, A. Aguirre-Santaella, E. Amato, E. O. Angüner, Christopher Eckner, 2021, drugi sestavni deli Opis: Astrophysical observations provide strong evidence that more than 80% of all matter in the Universe is in the form of dark matter (DM). Two leading candidates of particles beyond the Standard Model that could constitute all or a fraction of the DM content are the so-called Weakly Interacting Massive Particles (WIMPs) and Axion-Like Particles (ALPs). The upcoming Cherenkov Telescope Array, which will observe gamma rays between 20 GeV and 300 TeV with unprecedented sensitivity, will have unique capabilities to search for these DM candidates. A particularly promising target for WIMP searches is the Galactic Center. WIMPs with annihilation cross sections correctly producing the DM relic density will be detectable with CTA, assuming an Einasto-like density profile and WIMP masses between 200 GeV and 10 TeV. Regarding new physics beyond DM, CTA observations will also enable tests of fundamental symmetries of nature such as Lorentz invariance. Ključne besede: dark matter, weakly interacting massive particles, axion-like particles, fundamental physics, Lorentz invariance, Cherenkov Telescope Array Observatory Objavljeno v RUNG: 09.01.2025; Ogledov: 351; Prenosov: 5
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