Dark matter interpretation of the 
<i>Fermi</i>
-LAT observations toward the outer halo of M31

Karwin, Chris; Murgia, S.; Moskalenko, I. V.; Fillingham, Sean P.; Burns, Anne-Katherine; Fieg, Max

doi:10.1103/physrevd.103.023027

Cited by 34 publications

(25 citation statements)

References 106 publications

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“…In particular, the DM interpretation is supported by observations of the excess in CR antiprotons and with observations of the extended 400 kpc-across the gamma ray halo around the Andromeda galaxy (M31) [61]. In both cases the excesses are observed in the same energy range [62] giving strong support to the DM scenario. Meanwhile, the conventional astrophysical interpretation in terms of the weak unresolved gamma ray sources is supported with the logN-logS plots [57,58].…”

Section: Understanding the Galactic Center Gamma-ray Excesssupporting

confidence: 54%

Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)

Orlando,

Bottacini,

Moiseev

et al. 2021

Preprint

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The sky at MeV energies is currently poorly explored. Here we present an innovative mission concept and we outline the scientific motivation for combining a coded mask and a Compton telescope. The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO) is a novel concept for a next-generation telescope covering hard X-ray and soft gamma-ray energies. The potential and importance of this approach that will bridge the observational gap in the MeV energy range are presented. With the unprecedented angular resolution of the coded mask telescope combined with the sensitive Compton telescope, a mission such as GECCO will finally disentangle the discrete sources from the truly diffuse emission, unveiling the origin of the gamma-ray Galactic center excess and the Fermi Bubbles, and uncovering properties of lowenergy cosmic rays, and their propagation in the Galaxy. Individual Galactic and extragalactic sources will be detected, which will also allow studies of source populations. Nuclear and annihilation lines will be spatially and spectrally resolved from the continuum emission and from sources, addressing the role of low-energy cosmic rays in star formation and galaxy evolution, the origin of the 511 keV positron line, fundamental physics, and the chemical enrichment in the Galaxy. It will also detect explosive transient gamma-ray sources, which will enable identifying and studying the astrophysical objects that produce gravitational waves and neutrinos in a multi-messenger context. A GECCO mission will provide essential contributions to the areas "New Messengers and New Physics" and "Unveiling the Drivers of Galaxy Growth" emphasized in the Decadal Report on Astronomy and Astrophysics 2020.

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Section: Understanding the Galactic Center Gamma-ray Excesssupporting

confidence: 54%

Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)

Orlando,

Bottacini,

Moiseev

et al. 2021

Preprint

Self Cite

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“…[243]. If the true solution is DM or a diffuse signal from cosmic rays, it may be more difficult to establish a fully convincing case -although the AMS-02 antiproton excess discussed in the previous lecture is (if real) a possible counterpart signal; there is a claimed possible counterpart gamma-ray signal from M31 [244,245]; and given the cross-section needed to explain the GCE, the GAPS experiment [246] could potentially detect anti-deuterons for a confirmation in a low-background channel. and the students attending the school for their excellent questions and comments.…”

Section: Where Next?mentioning

confidence: 98%

Les Houches Lectures on Indirect Detection of Dark Matter

Slatyer

2021

Preprint

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These lectures, presented at the 2021 Les Houches Summer School on Dark Matter, provide an introduction to key methods and tools of indirect dark matter searches, as well as a status report on the field circa summer 2021. Topics covered include the possible effects of energy injection from dark matter on the early universe, methods to calculate both the expected energy distribution and spatial distribution of particles produced by dark matter interactions, an outline of theoretical models that predict diverse signals in indirect detection, and a discussion of current constraints and some claimed anomalies. These notes are intended as an introduction to indirect dark matter searches for graduate students, focusing primarily on intuition-building estimates and useful concepts and tools.

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“…where the lower(upper) value corresponds to the power law plus cutoff(pure power law) fit to data. Based on the large extension of −ray halo, on the intensity and spectrum of the various components, the authors of [4] suggest a dark matter interpretation for such emission [5] and conclude that it is unlikely that a major fraction of the emission is due to cosmic ray (CR) in the halo of M31.…”

Section: Gevmentioning

confidence: 99%

Giant cosmic ray halos around M31 and the Milky Way

Gabici¹,

Recchia²,

Aharonian³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Recently, a diffuse emission of 1-100 GeV -rays has been detected from the direction of M31, extending up to 200 kpc from its center. The interpretation of the extended −ray emission by the escape of cosmic rays produced in the galactic disk or in the galactic center is problematic. In this paper, we argue that a cosmic ray origin (either leptonic or hadronic) of the -ray emission is possible in the framework of non standard cosmic ray propagation scenarios or is caused by in situ particle acceleration in the galaxy's halo. Correspondingly, the halo is powered by the galaxy's nuclear activity or by the accretion of intergalactic gas. If the formation of cosmic ray halos around galaxies is a common phenomenon, the interactions of cosmic ray protons and nuclei with the circumgalactic gas surrounding Milky Way could be responsible for the isotropic diffuse flux of neutrinos observed by Icecube.

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Dark matter interpretation of the Fermi -LAT observations toward the outer halo of M31

Cited by 34 publications

References 106 publications

Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)

Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)

Les Houches Lectures on Indirect Detection of Dark Matter

Giant cosmic ray halos around M31 and the Milky Way

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