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

Hiroshima, Nagisa; Hayashida, M.; Kohri, Kazunori

doi:10.1103/physrevd.99.123017

Cited by 8 publications

(8 citation statements)

References 164 publications

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“…Such WIMP masses (assuming the thermal cross section) are poorly reached by both Fermi-LAT and ground-based Cherenkov telescopes including CTA, see e.g. figure 3 in [43]. Thus additional observations by GAMMA-400 with an excellent quality of photons above 10 GeV may play a significant role in "bridging" this mass gap.…”

Section: Ts Dm = 57mentioning

confidence: 99%

Dark matter searches by the planned gamma-ray telescope GAMMA-400

Egorov,

Topchiev,

Galper

et al. 2020

Preprint

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Our paper reviews the planned space-based gamma-ray telescope GAMMA-400 and evaluates in details its opportunities in the field of dark matter (DM) indirect searches. We estimated the GAMMA-400 mean sensitivity to the diphoton DM annihilation cross section in the Galactic center for DM particle masses in the range of 1-500 GeV. We obtained the sensitivity gain at least by 1.2-1.5 times (depending on DM particle mass) with respect to the expected constraints from 12 years of observations by Fermi-LAT for the case of Einasto DM density profile. The joint analysis of the data from both telescopes may yield the gain up to 1.8-2.3 times. Thus the sensitivity reaches the level of annihilation cross section σv γγ (m χ = 100 GeV) ≈ 10 −28 cm 3 /s. This will allow us to test the hypothesized narrow lines predicted by specific DM models, particularly the recently proposed pseudo-Goldstone boson DM model. We estimated the GAMMA-400 sensitivity to axion-like particle (ALP) parameters by a potential observation of the supernova explosion in the Local Group. This is very sensitive probe of ALPs reaching the level of ALP-photon coupling constant g aγ ∼ 10 −13 GeV −1 for ALP masses m a 1 neV. We also calculated the sensitivity to ALPs by constraining the modulations in the spectra of the Galactic gamma-ray pulsars due to possible ALP-photon conversion. GAMMA-400 is expected to be more sensitive than the CAST helioscope for ALP masses m a ≈ (1 − 10) neV reaching g min aγ ≈ 2 • 10 −11 GeV −1 . Other potentially interesting targets and candidates are briefly considered too.

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Section: Ts Dm = 57mentioning

confidence: 99%

Dark matter searches by the planned gamma-ray telescope GAMMA-400

Egorov,

Topchiev,

Galper

et al. 2020

Preprint

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“…We note that these expressions are valid for subhalos with NFW density profiles; see ref. [44] for a discussion of the impact of density profile uncertainties on projected constraints. We use eq.…”

Section: Astrophysical J -Factormentioning

confidence: 99%

Discovery prospects of dwarf spheroidal galaxies for indirect dark matter searches

Ando

Kavanagh

Macías

et al. 2019

J. Cosmol. Astropart. Phys.

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We study the prospects for the Large Synoptic Survey Telescope (LSST) to find new dwarf spheroidal galaxies in the Milky Way. Adopting models of Milky-Way halo substructure and phenomenological prescriptions connecting subhalos and satellite galaxies, we obtain surface brightness distributions of V-band magnitude that lead us to predict that LSST will discover tens to hundreds of dwarf spheroidal galaxies above its sensitivity. The soon-to-be-discovered dwarfs will be interesting targets for indirect searches of dark matter annihilation yields. We forecast the distribution function of gamma-ray emission from dark matter annihilation in these objects, and discuss the detectability of these signals at both Fermi Large Area Telescope (LAT) and Cherenkov Telescope Array (CTA). By combining information from the predicted dwarf galaxies, we obtain an expected sensitivity to the annihilation cross section ⟨ σ v ⟩ of 10−26 cm3 s−1 (for dark matter particles of mass 10 GeV with Fermi-LAT) and 5× 10−24 cm3 s−1 (for dark matter particles of mass 500 GeV with CTA). We find that the current uncertainties in the mass measurement of the Milky-Way halo are relatively minor compared with the Poisson errors associated to drawing the most promising dwarfs from the underlying flux distribution.

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“…An upcoming telescope array that can improve our understanding of trans-TeV DM is the Cherenkov telescope Array (CTA) [20,21] which looks for highly energetic gamma-rays, arising either from direct decay of quasi-stable DM or from cascades. Considerable attention has been already paid to the potential of CTA observation in photonic annihilation of DM pairs [22][23][24][25]. It is comparably interesting to investigate similar potential of the CTA as well as the already existing Fermi-LAT, as far as decaying DM is concerned [11,26,27].…”

Section: Introductionmentioning

confidence: 99%

Search for decaying heavy dark matter in an effective interaction framework: a comparison of $γ$-ray and radio observations

Ghosh,

Kar,

Mukhopadhyaya

2020

Preprint

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We investigate and compare the possibilities of observing decaying dark matter (DM) in γ-ray and radio telescopes. The special emphasise of the study is on a scalar heavy DM particle with mass in the trans-TeV range. DM decays, consistent with existing limits on the life time, are assumed to be driven by higher dimensional effective operators. We consider both two-body decays of a scalar dark particle and a dark sector having threebody decays, producing two standard model particles. It is found that the Fermi-LAT data on isotropic γ-ray background provides the best constraints so far, although the CTA telescope may be more effective for decays where one or two photons are directly produced. In all cases, deeper probes of the effective operators are possible in the upcoming SKA radio telescope with a few hundred hours of observation, using the radio synchrotron flux coming from energetic electrons produced in the decay cascades within dwarf spheroidal galaxies. Finally, we estimate how the SKA can constrain the parameter space spanned by the galactic magnetic field and the diffusion coefficient, if observations consistent with γ-ray data actually take place.

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

Cited by 8 publications

References 164 publications

Dark matter searches by the planned gamma-ray telescope GAMMA-400

Dark matter searches by the planned gamma-ray telescope GAMMA-400

Discovery prospects of dwarf spheroidal galaxies for indirect dark matter searches

Search for decaying heavy dark matter in an effective interaction framework: a comparison of $γ$-ray and radio observations

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