scholarly journals Dependence of accessible dark matter annihilation cross sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array

2019 ◽  
Vol 99 (12) ◽  
Author(s):  
Nagisa Hiroshima ◽  
Masaaki Hayashida ◽  
Kazunori Kohri
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Dark Matter Annihilation ◽  
Density Profiles ◽  
Telescope Array ◽  
Dwarf Spheroidal Galaxies ◽  
Cherenkov Telescope ◽  
Spheroidal Galaxies

scholarly journals Searching for Dark Matter signatures in dwarf spheroidal galaxies with the ASTRI mini-array in the framework of Cherenkov Telescope Array

2016 ◽  
Vol 718 ◽  
pp. 042068
Author(s):  
P Giammaria ◽  
S Lombardi ◽  
L A Antonelli ◽  
E Brocato ◽  
C Bigongiari ◽  
...  
Keyword(s):  
Dark Matter ◽  
Telescope Array ◽  
Dwarf Spheroidal Galaxies ◽  
Cherenkov Telescope ◽  
Spheroidal Galaxies

scholarly journals The quest for dark matter in dwarf spheroidal galaxies with the Cherenkov Telescope Array

2019 ◽  
Vol 209 ◽  
pp. 01024 ◽  
Author(s):  
Francesco G. Saturni ◽  
Gonzalo Rodríguez-Fernández ◽  
Aldo Morselli
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Dwarf Galaxy ◽  
Telescope Array ◽  
Kinematic Data ◽  
Dwarf Spheroidal Galaxies ◽  
Cherenkov Telescopes ◽  
Cherenkov Telescope ◽  
Galaxy Halos ◽  
Spheroidal Galaxies

Dwarf spheroidal galaxies are among the best environments that can be studied with Cherenkov telescopes for indirect searches of γ-ray signals coming from dark matter self-interaction (annihilation or decay), due to their proximity and negligible background emission. We present new determinations of the dark-matter amount – i.e. the astrophysical factors J and D – in dwarf-galaxy halos obtained through the MCMC Jeans analysis of their brightness and kinematic data. Such factors are of great importance to test the performances of the next-generation γ-ray instruments such as the Cherenkov Telescope Array in detecting dark-matter signals from astronomical environments, or constraining the limits to dark-matter physics parameters (particle mass and lifetime, annihilation cross section).

scholarly journals Dark matter annihilation and decay in dwarf spheroidal galaxies: the classical and ultrafaint dSphs

2015 ◽  
Vol 453 (1) ◽  
pp. 849-867 ◽  
Author(s):  
V. Bonnivard ◽  
C. Combet ◽  
M. Daniel ◽  
S. Funk ◽  
A. Geringer-Sameth ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Annihilation ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

scholarly journals Constraining Velocity-dependent Self-Interacting Dark Matter with the Milky Way’s dwarf spheroidal galaxies

2021 ◽  
Author(s):  
Camila A Correa
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Cross Sections ◽  
Yukawa Potential ◽  
Analytical Form ◽  
Orbital Evolution ◽  
Particle Model ◽  
Velocity Correlation ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

Abstract The observed anti-correlation between the central dark matter (DM) densities of the bright Milky Way (MW) dwarf spheroidal galaxies (dSphs) and their orbital pericenter distances poses a potential signature of self-interacting dark matter (SIDM). In this work we investigate this possibility by analysing the range of SIDM scattering cross section per unit mass, σ/mχ, able to explain such anti-correlation. We simulate the orbital evolution of dSphs subhaloes around the MW assuming an analytical form for the gravitational potential, adopting the proper motions from the Gaia mission and including a consistent characterization of gravitational tidal stripping. The evolution of subhalo density profiles is modelled using the gravothermal fluid formalism, where DM particle collisions induce thermal conduction that depends on σ/mχ. We find that models of dSphs, such as Carina and Fornax, reproduce the observed central DM densities with fixed σ/mχ ranging between 30 and 50 cm2g−1, whereas other dSphs prefer larger values ranging between 70 and 100 cm2g−1. These cross sections correlate with the average collision velocity of DM particles within each subhalo’s core, so that systems modelled with large cross sections have lower collision velocities. We fit the cross section-velocity correlation with a SIDM particle model, where a DM particle of mass mχ = 53.93 ± 9.81 GeV interacts under the exchange of a light mediator of mass mφ = 6.6 ± 0.43 MeV, with the self-interactions being described by a Yukawa potential. The outcome is a cross section-velocity relation that explains the diverse DM profiles of MW dSph satellites and is consistent with observational constraints on larger scales.

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