Gamma-ray and synchrotron radiation from dark matter annihilations in ultra-faint dwarf galaxies

The very large (100–1000) mass-to-light ratio applicable to the ultra-faint dwarf galaxies (UFDs) implies a high concentration of dark matter, thus rendering them ideal theatres for indirect signatures of dark matter. In this paper, we consider 14 recently discovered UFDs and study the electromagnet...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2021-06, Vol.2021 (6), p.41
Main Authors: Bhattacharjee, Pooja, Choudhury, Debajyoti, Das, Kasinath, Kumar Ghosh, Dilip, Majumdar, Pratik
Format: Article
Language:English
Subjects:
Dark matter
dark matter experiments
dark matter theory
Dwarf galaxies
dwarfs galaxies
Electromagnetic radiation
Fluxes
gamma ray theory
Gamma rays
Radiation
Radio frequency
Radio telescopes
Synchrotron radiation
Synchrotrons
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Summary:The very large (100–1000) mass-to-light ratio applicable to the ultra-faint dwarf galaxies (UFDs) implies a high concentration of dark matter, thus rendering them ideal theatres for indirect signatures of dark matter. In this paper, we consider 14 recently discovered UFDs and study the electromagnetic radiation emanating from them over a wide range, from gamma ray down to radio frequencies. We analyze the Fermi-LAT data on high energy gamma rays and radio fluxes at the GMRT and VLA to obtain upper limits on annihilation cross section ⟨σ v⟩ in a model independent way. We further discuss the sensitivity of the Square Kilometer Array radio telescope in probing the synchrotron radiation from the aforementioned UFDs. We also investigate the dependences of the said upper limits on the uncertainties in the determination of various astrophysical parameters.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2021/06/041