Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00643097" target="_blank" >RIV/67985815:_____/25:00643097 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/25:00643097 RIV/00216208:11320/25:10510712 RIV/61989592:15310/25:73632907

Result on the web

<a href="https://hdl.handle.net/11104/0372944" target="_blank" >https://hdl.handle.net/11104/0372944</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staf1798" target="_blank" >10.1093/mnras/staf1798</a>

Result language

angličtina

Original language name

Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory

Original language description

The dwarf spheroidal galaxies (dSphs) orbiting the Milky Way are widely regarded as systems supported by velocity dispersion against self-gravity, and as prime targets for the search for indirect dark matter (DM) signatures in the GeV-to-TeV γ -ray range owing to their lack of astrophysical γ -ray background. We present forecasts of the sensitivity of the forthcoming Cherenkov Telescope Array Observatory (CTAO) to annihilating or decaying DM signals in these targets. An original selection of candidates is performed from the current catalogue of known objects, including both classical and ultrafaint dSphs. For each, the expected DM content is derived using the most comprehensive photometric and spectroscopic data available, within a consistent framework of analysis. This approach enables the derivation of novel astrophysical factor profiles for indirect DM searches, which are compared with results from the literature. From an initial sample of 64 dSphs, eight promising targets are identified – Draco I, Coma Berenices, Ursa Major II, Ursa Minor, and Willman 1 in the North, Reticulum II, Sculptor, and Sagittarius II in the South – for which different DM density models yield consistent expectations, leading to robust predictions. CTAO is expected to provide the strongest limits above ∼10 TeV, reaching velocity-averaged annihilation cross sections of ∼ 5 × 10−25 cm3 s−1 and decay lifetimes up to ∼ 1026 s for combined limits. The dominant uncertainties arise from the imprecise determination of the DM content, particularly for ultrafaint dSphs. Observation strategies are proposed that optimize either deep exposures of the best candidates or diversified target selections.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Volume of the periodical

544

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

41

Pages from-to

2946-2986

UT code for WoS article

001629107600001

EID of the result in the Scopus database

2-s2.0-105022942905