Constraining annihilating dark matter by radio data of M33

Chan, Man Ho

doi:10.1103/physrevd.96.043009

Cited by 18 publications

(44 citation statements)

References 44 publications

(78 reference statements)

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“…The distance to the halo centre is taken to be 840 kpc. The magnetic field radial profile will be assumed to follow an exponential form (as this is common for spiral galaxies [61]) and we will take B 0 such that the average field within 7.5 kpc is 8.1 ± 0.5 µG following [32] based on the results from [62].…”

Section: M33mentioning

confidence: 99%

“…When studying M33 we use data points from [32] to compare to DM fluxes predicted within a radius of 7.5 kpc of the halo centre. The data point [43] is compared to an ROI of 1.5 arcmin only.…”

Section: Constraints From M33mentioning

confidence: 99%

“…In particular the faintness of diffuse radio emissions around many cosmic structures means they can provide very strong constraints on DM emissions [25,34,35].In this work we will focus in particular on nearby galaxies as target environments. This is due to recent work done in [32,33], which used radio-frequency data on M33 and M31 to produce constraints on viable DM models through synchrotron emissions produced by secondary electrons from DM annihilation. In particular claiming to be able rule out models designed to account for AMS-02 positron [18] and Galactic Centre GeV gamma-ray [37] excesses.…”

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confidence: 99%

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An excess of excesses examined via dark matter radio emissions from galaxies

Beck

2019

J. Cosmol. Astropart. Phys.

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Cosmic-ray and gamma-ray observations have yielded several notable excesses that often lend themselves to explanation by various dark matter annihilation/decay models. In particular, the AMS-02 anti-proton and positron excesses have continued to grow more robust with the collection of more data. This is supplemented by gamma-ray excesses in the Galactic Centre and a high-energy break in the spectrum of electron/positron cosmic rays seen by DAMPE. In this work we carefully model the magnetic field environments of M31 and M33 and use this to estimate expected synchrotron emissions from electrons produced via dark matter annihilation. By comparing this to available radio data we review simplifying assumptions used previously for dark matter hunting in these environments and produce novel constraints that are capable of fully ruling out dark matter models proposed to accommodate all the aforementioned excesses barring that of DAMPE. However, we do show that significant constraints can be placed upon the DAMPE parameter space with M31 data. In addition to this we project SKA non-observation constraints for the Reticulum II and Triangulum II dwarf galaxies and find these have potential to rule out cosmic-ray and gamma-ray excess-producing models of dark matter, even when the most conservative assumptions are employed.This resurgence of old DM explanations as well as new ones from [26] can benefit from a multi-frequency and multi-target approach. Where we use the near-universality of DM in cosmic structures to subject DM explanations to scrutiny in situations outside those that suggested the excess in the first place. In particular it has been argued in the literature that radio frequency observations can play a strong role in probing the nature of DM, especially in light of the upcoming Square Kilometre Array (SKA) [25,[29][30][31][32][33]. This stance has received some experimental backing with recent works such as [34,35] (for a summary of DM hunting via radio in dwarf galaxies see [36]). In particular the faintness of diffuse radio emissions around many cosmic structures means they can provide very strong constraints on DM emissions [25,34,35].In this work we will focus in particular on nearby galaxies as target environments. This is due to recent work done in [32,33], which used radio-frequency data on M33 and M31 to produce constraints on viable DM models through synchrotron emissions produced by secondary electrons from DM annihilation. In particular claiming to be able rule out models designed to account for AMS-02 positron [18] and Galactic Centre GeV gamma-ray [37] excesses. We reconsider both the data used in the aforementioned works and additional data from other sources such as [38][39][40][41][42][43]. Unlike [32,33] our modelling of DM emissions includes all diffusive effects and, by numerical means, is somewhat less approximate in its treatment of DM synchrotron emissions. We demonstrate that the impact of the results in [32,33] is somewhat predicated on their assumption of a constant magnetic field and ...

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Section: M33mentioning

confidence: 99%

Section: Constraints From M33mentioning

confidence: 99%

mentioning

confidence: 99%

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An excess of excesses examined via dark matter radio emissions from galaxies

Beck

2019

J. Cosmol. Astropart. Phys.

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“…If such a physical process does indeed occur, then a large number of gamma-ray photons and positrons could be produced. Observationally, some excess positron emission in our galaxy has been detected [32][33][34][35][36][37][38][39]. Therefore, it may be possible that the excess positron and gamma-ray emissions could be explained by the annihilation of dark matter with mass m ∼ 10-100 GeV [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it may be possible that the excess positron and gamma-ray emissions could be explained by the annihilation of dark matter with mass m ∼ 10-100 GeV [32][33][34]. For a detailed discussion of this problem, as well as of the possibility of alternative interpretations of the observational data see [35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Slowly rotating Bose Einstein condensate galactic dark matter halos, and their rotation curves

et al. 2018

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If dark matter is composed of massive bosons, a Bose-Einstein condensation process must have occurred during the cosmological evolution. Therefore galactic dark matter may be in a form of a condensate, characterized by a strong self-interaction. We consider the effects of rotation on the Bose-Einstein condensate dark matter halos, and we investigate how rotation might influence their astrophysical properties. In order to describe the condensate we use the Gross-Pitaevskii equation, and the Thomas-Fermi approximation, which predicts a polytropic equation of state with polytropic index n = 1. By assuming a rigid body rotation for the halo, with the use of the hydrodynamic representation of the Gross-Pitaevskii equation we obtain the basic equation describing the density distribution of the rotating condensate. We obtain the general solutions for the condensed dark matter density, and we derive the general representations for the mass distribution, boundary (radius), potential energy, velocity dispersion, tangential velocity and for the logarithmic density and velocity slopes, respectively. Explicit expressions for the radius, mass, and tangential velocity are obtained in the first order of approximation, under the assumption of slow rotation. In order to compare our results with the observations we fit the theoretical expressions of the tangential velocity of massive test particles moving in rotata

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Constraining the axion–photon coupling using radio data of the Bullet cluster

Chan

2021

Sci Rep

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Axion is one of the most popular candidates of the cosmological dark matter. Recent studies considering the misalignment production of axions suggest some benchmark axion mass ranges near $$m_a \sim 20$$ m a ∼ 20 μeV. For such axion mass, the spontaneous decay of axions can give photons in radio band frequency $$\nu \sim 1{-}3$$ ν ∼ 1 - 3 GHz, which can be detected by radio telescopes. In this article, we show that using radio data of galaxy clusters would be excellent to constrain axion dark matter. Specifically, by using radio data of the Bullet cluster (1E 0657-55.8), we find that the upper limit of the axion–photon coupling constant can be constrained to $$g_{a \gamma \gamma } \sim 10^{-12}{-}10^{-11}$$ g a γ γ ∼ 10 - 12 - 10 - 11 GeV$$^{-1}$$ - 1 for $$m_a \sim 20$$ m a ∼ 20 μeV, which is tighter than the limit obtained by the CERN Axion Solar Telescope (CAST).

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Constraining annihilating dark matter by radio data of M33

Cited by 18 publications

References 44 publications

An excess of excesses examined via dark matter radio emissions from galaxies

An excess of excesses examined via dark matter radio emissions from galaxies

Slowly rotating Bose Einstein condensate galactic dark matter halos, and their rotation curves

Constraining the axion–photon coupling using radio data of the Bullet cluster

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