The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge

Bartels, Richard; Storm, Emma; Weniger, Christoph; Calore, Francesca

doi:10.1038/s41550-018-0531-z

Cited by 129 publications

(207 citation statements)

References 102 publications

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“…This distinctive morphology also allows the model to evade the constraints of Clark et al (2016) that ruled out a DM interpretation of the excess in terms of ultra-compact mini-halos. We note that the constraints of Clark et al (2016) do not account for more recent studies of the GC emission that revealed a more complex spatial morphology (Ackermann et al 2017;Bartels et al 2017). Finally, we expect the central massive BHs seen in nearby galactic centers, if indeed formed in the early universe, to have DM spikes, and hence to be Fermi γ-ray sources.…”

Section: Discussionmentioning

confidence: 93%

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Intermediate-mass Black Holes and Dark Matter at the Galactic Center

Lacroix

Silk

2018

ApJL

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Could there be a large population of intermediate-mass black holes (IMBHs) formed in the early universe? Whether primordial or formed in Population III, these are likely to be very subdominant compared to the dark matter density, but could seed early dwarf galaxy/globular cluster and supermassive black hole formation. Via survival of dark matter density spikes, we show here that a centrally concentrated relic population of IMBHs, along with ambient dark matter, could account for the Fermi gamma-ray "excess" in the Galactic center because of dark matter particle annihilations.

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Section: Discussionmentioning

confidence: 93%

“…Firstly, the MWG may have a DM core (Portail et al 2017). Second, the Fermi excess can be fit, according to a reanalysis, by a stellar mass (bulge)-related profile (Bartels et al 2017).…”

Section: Global Signal and Spatial Morphologymentioning

confidence: 99%

Intermediate-mass Black Holes and Dark Matter at the Galactic Center

Lacroix

Silk

2018

ApJL

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“…Although the origin of the Galactic Center excess has not yet been singled out, recent studies have presented strong evidence that the origin of this signal is related to the stars (e.g., [28][29][30]). It is true that the Galactic center is where the most luminous annihilating DM emission is expected, however, it is difficult to disentangle a DM signal from this region due to large background and foreground uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Constraining dark matter annihilation with HSC low surface brightness galaxies

Hashimoto

Macías

Nishizawa

et al. 2020

J. Cosmol. Astropart. Phys.

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Searches for dark matter annihilation signals have been carried out in a number of target regions such as the Galactic Center and Milky Way dwarf spheroidal galaxies (dSphs), among a few others. Here we propose low surface brightness galaxies (LSBGs) as novel targets for the indirect detection of dark matter emission. In particular, LSBGs are known to have very large dark matter contents and be less contaminated by extragalactic γ-ray sources (e.g., blazars) compared to star forming galaxies. We report on an analysis that uses eight LSBGs (detected by Subaru Hyper Suprime-Cam survey data) with known redshifts to conduct a search for γ-ray emission at the positions of these new objects in Fermi Large Area Telescope data. We found no excesses of γ-ray emission and set constraints on the dark matter annihilation cross-section. We exclude (at the 95% C.L.) dark matter scenarios predicting a cross-section higher than ∼ 10 −23 [cm 3 /s] for dark matter particles of mass 10 GeV self-annihilating in the bb channel. Although this constraint is weaker than the ones reported in recent studies using other targets, we note that in the near future, the number of detections of new LSBGs will increase by a few orders of magnitude. We forecast conservatively that using the full catalog of soon-to-be-detected LSBGs will allow us to exclude the canonical thermal relic cross-section for dark matter particles with masses up to several tens of GeV.

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“…Also, it is possible that the Galactic centre excess is not due to DM annihilation but to astrophysical sources (e.g. Bartels et al 2018), and in this case the value of the annihilation cross section determined from the Galactic centre excess should be reduced.…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulent reacceleration on electrons produced by dark matter annihilation in the Coma cluster

Marchegiani

2019

Monthly Notices of the Royal Astronomical Society

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In this paper we study the effect of reacceleration provided by turbulences on electrons produced by dark matter (DM) annihilation in the Coma cluster. We use a simplified phenomenological model to describe the effect of the turbulences, and explore a limited subset of three possible DM models for neutralino particles with different mass and annihilation channel. We find that, for values of the annihilation cross section of the order of the upper limits found with Fermi-LAT measurements in astrophysical objects, and for conservative values of the boosting factor due to DM substructures, the reacceleration due to turbulences can enhance the radio emission produced by DM-originated electrons up to the level of the observed flux of the radio halo in Coma, for moderate reacceleration intensity in relatively short times. Therefore we conclude that, even if it is not possible to distinguish between the fits obtained in this paper because of the scattering present in the radio flux data, the electrons produced by DM annihilation can be possible seed electrons for the reacceleration, as well as secondary electrons of hadronic origin. A possible discriminant between these two classes of models is the flux produced in the gamma ray band, that in the case of DM-originated electrons should be more than two orders of magnitude smaller than the present Fermi-LAT upper limits, whereas in the hadronic case the expected gamma ray flux should be close to the value of present upper limits.

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The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge

Cited by 129 publications

References 102 publications

Intermediate-mass Black Holes and Dark Matter at the Galactic Center

Intermediate-mass Black Holes and Dark Matter at the Galactic Center

Constraining dark matter annihilation with HSC low surface brightness galaxies

Effect of turbulent reacceleration on electrons produced by dark matter annihilation in the Coma cluster

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