Analysis of the very inner Milky Way dark matter distribution and gamma-ray signals

Gammaldi, Viviana; Ávila-Reese, V.; Valenzuela, O.; González‐Morales, Alma X.

doi:10.1103/physrevd.94.121301

Cited by 23 publications

(34 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The combination of the gamma-ray flux expected by DM annihilation events with a power-law background component well fits the gamma-ray spectra of Fermi-LAT and HESS data with a thermal DM particle of mass of 48.8 TeV that annihilates in the W + W − boson channel[62,63]. Upper Right:Figure from[96]. The enhancement of 10 3 required in order to fit the gamma-ray spectra can be explained by the J-factor of a BH-induced DM-spike in hydrodinamical N-body simulations with a cusp profile.…”

supporting

confidence: 61%

Multimessenger Multi-TeV Dark Matter

Gammaldi

2019

Front. Astron. Space Sci.

View full text Add to dashboard Cite

We briefly review the general insight into the indirect searches of dark matter. We discuss the primary equation in a three-level multimessenger approach (gamma rays, neutrinos and antiprotons), and we introduce the reader to the main topics and related uncertainties (e.g. dark matter density distribution, cosmic rays, particle physics). As an application of the general concept, we focus on the multi-TeV dark matter candidate among other weak interactive massive particles. We present the state-of-the-art on this sub-field, and we discuss open questions and experimental limitations.

show abstract

supporting

confidence: 61%

Multimessenger Multi-TeV Dark Matter

Gammaldi

2019

Front. Astron. Space Sci.

View full text Add to dashboard Cite

show abstract

“…The authors of Ref. [35] discussed the impact of the outer halo on the spike modelespecially on the outer radius of the spike R sp -using the prescription given in Ref. [1] (see Appendix A).…”

Section: B Electron Propagation In the Presence Of Advectionmentioning

confidence: 99%

Unique probe of dark matter in the core of M87 with the Event Horizon Telescope

et al. 2017

View full text Add to dashboard Cite

We demonstrate the unprecedented capabilities of the Event Horizon Telescope (EHT) to image the innermost dark matter profile in the vicinity of the supermassive black hole at the center of the M87 radio galaxy. We present the first model of the synchrotron emission induced by dark matter annihilations from a spiky profile in the close vicinity of a supermassive black hole, accounting for strong gravitational lensing effects. Our results show that the EHT should readily resolve dark matter spikes if present. Moreover, the photon ring surrounding the silhouette of the black hole is clearly visible in the spike emission, which introduces observable small-scale structure into the signal. We find that the dark matter-induced emission provides an adequate fit to the existing EHT data, implying that in addition to the jet, a dark matter spike may account for a sizable portion of the millimeter emission from the innermost (subparsec) region of M87. Regardless, our results show that the EHT can probe very weakly annihilating dark matter. Current EHT observations already constrain very small cross sections, typically down to a few 10 −31 cm 3 s −1 for a 10 GeV candidate, close to characteristic values for p-wave-suppressed annihilation. Future EHT observations will further improve constraints on the DM scenario. PACS numbers: 95.35.+d, 95.55.Br

show abstract

“…Attentive strategies in the separation of DM signals from astrophysical emissions are required since the galactic center is very bright in astrophysical γ-ray emissions [59]. Also, the determination of the precise shape and a normalization of the DM density distribution at the very center of the Milky Way galaxy are remaining issues [60][61][62][63]. Dwarf spheroidal galaxies (dSphs) are satellites of the Milky Way galaxy and also good regions to focus on as first pointed out by Ref.…”

Section: Introductionmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

Dwarf spheroidal galaxies are excellent targets in γ-ray searches for dark matter. We consider dark matter searches in dwarf spheroidal galaxies (dSphs) with the Cherenkov Telescope Array (CTA). The aim of this work is to reveal a quantitative and precise dependence of the accessible dark matter annihilation cross-sections on the dark matter density profiles of dSphs and on the distance to them. In most data analyses, researchers have assumed point-like signals from dSphs because it is difficult to resolve the expected emission profiles with current γ-ray observatories. In future however, CTA will be able to resolve the peak emission profiles in dSphs. We take several variations of the dark matter density profile of Draco dSph as examples and analyze the simulated observations of with CTA. We derive the accessible region of the dark matter annihilation crosssection with each dark matter density profile. The accessible region of the annihilation cross-section can differ by a factor of 10 among plausible profiles. We also examine the dependence on the distance to the target dSphs by assuming the same profiles of dSphs at different distances. Closer targets are better due to the higher J-factor, while their spatial extension significantly degrades our reach to the annihilation cross-section compared to the value expected from a simple distance-scaling of the J-factor. Spatial extension of the source affects the probable parameter region in energy-dependent ways. In some γ-ray energy ranges, this behaviour becomes moderately dependent on the properties of the observation facility.

show abstract

Analysis of the very inner Milky Way dark matter distribution and gamma-ray signals

Cited by 23 publications

References 48 publications

Multimessenger Multi-TeV Dark Matter

Multimessenger Multi-TeV Dark Matter

Unique probe of dark matter in the core of M87 with the Event Horizon Telescope

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

Contact Info

Product

Resources

About