Gamma-Ray Sensitivity to Dark Matter Subhalo Modelling at High Latitudes

Calore, Francesca; Hütten, Moritz; Stref, Martin

doi:10.3390/galaxies7040090

Cited by 21 publications

(35 citation statements)

References 49 publications

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“…Moreover, given the similar results we get for point-like and extended templates, such a sensitivity estimate is compatible with what is found for the Fermi -LAT sensitivity to point-like DM subhalos, e.g. [7,9]. A firm detection (above 5σ, without accounting for lookelsewhere effects) would instead need cross sections at least as high as 5 − 6 × 10 −26 cm 3 /s -which, again, is not excluded by current gamma-ray constraints.…”

Section: Resultssupporting

confidence: 90%

“…[6], searches towards known dwarf spheroidal galaxies look for excess(es) of photons above the atrophysical background, compatible with point-like DM signal(s) from the dwarf(s) direction(s). Analogously, most of the sensitivity predictions for DM subhalo detectability [7][8][9], as well as searches for DM subhalos in unidentified sources [10,11], treat DM subhalos as point-like objects.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT

Di Mauro,

Stref,

Calore

2020

Preprint

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Cold dark matter (DM) models for structure formation predict that DM subhalos are present in the Galaxy. In the standard paradigm of DM as weakly interacting massive particle, subhalos are expected to shine in gamma rays and to provide a signal detectable with current instruments, notably with the Large Area Telescope (LAT) aboard the Fermi satellite. This is the main motivation behind searches for DM signals towards dwarf spheroidal galaxies and unidentified Fermi-LAT sources. A significant angular extension detected from unassociated sources located at relatively high latitudes is considered a "smoking gun" signature for identifying DM subhalos. In the present work, we systematically explore, by means of state-of-the-art models of cold DM halos in the Galaxy, the detectability of extended subhalos with Fermi-LAT. We simulate a DM signal exploring different assumptions of subhalos distribution in the Galaxy and DM profile, and reconstruct its flux through a realistic Fermi-LAT analysis pipeline. In the most optimistic case, we show that a detection of extended DM subhalos can be made for annihilation cross sections higher than 3 × 10 −26 cm 3 /s (for a 100 GeV DM mass), still compatible with existing gamma-ray constraints, and that, in this case, the preference for extension of the source (vs point-like hypothesis) is significant. For fainter signals, instead, halos not only do not show significant extension, but they are not even detectable significantly as point-like sources.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT

Di Mauro,

Stref,

Calore

2020

Preprint

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“…[60], and further explored in, e.g., refs. [61][62][63][64]. This analytical subhalo population model can be easily applied to any host halo configuration.…”

Section: Gamma-ray Signals: Astrophysical Factors and Dm Phase-space ...mentioning

confidence: 99%

Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $γ$-ray signals

Facchinetti¹,

Stref²,

Lacroix³

et al. 2022

Preprint

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As searches for thermal and self-annihilating dark matter (DM) intensify, it becomes crucial to include as many relevant physical processes and ingredients as possible to refine signal predictions, in particular those which directly relate to the intimate properties of DM. We investigate the combined impact of DM subhalos and the (velocity-dependent) Sommerfeld enhancement of the annihilation cross section, in both the s-and p-wave cases. Both features are expected to play an important role in searches for thermal DM particle candidates with masses around or beyond TeV, or in scenarios with a light dark sector. We provide a detailed analytical description of the phenomena at play, and show how they scale with the subhalo masses and the main Sommerfeld parameters. We derive approximate analytical expressions for the overall boost factors resulting from these combined effects, from which the intricate phenomenology can be better understood, and which strongly increase gamma-ray signal predictions for typical targets of different masses (from dwarf galaxies to galaxy clusters). DM subhalos lead to an increase of the Sommerfeld effect by several orders of magnitude (for both the s-and p-wave cases), especially on resonances, which makes them critical to get sensible predictions.

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“…[310,317,318]), although uncertainties in the J-factor modeling can weaken the bound of the dSphs by a sizeable factor (e.g. [319]).…”

Section: Large Scale Structures and The Gamma-ray Backgroundmentioning

confidence: 99%

The Future of Gamma-Ray Experiments in the MeV-EeV Range

Engel¹,

Goodman²,

Huentemeyer³

et al. 2022

Preprint

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Naturally occurring particle accelerators shine brightly throughout the universe, inviting us to discover fundamental laws and hone our theories if we look in their directions with the right detectors. Gamma-rays, the most energetic photons, carry information from the far reaches of extragalactic space with minimal interaction or loss of information. They bring messages about particle acceleration in environments so extreme they cannot be reproduced on earth for a closer look. Gamma-ray astrophysics is so complementary with collider work that particle physicists and astroparticle physicists are often one in the same.Gamma-ray instruments, especially the Fermi Gamma-ray Space Telescope, have been pivotal in major multi-messenger discoveries over the past decade. There is presently a great deal of interest and scientific expertise available to push forward new technologies, to plan and build space-and ground-based gamma-ray facilities, and to build multimessenger networks with gamma rays at their core. It is therefore concerning that before the community comes together for planning exercises again, much of that infrastructure could be lost to a lack of long-term planning for support of gamma-ray astrophysics. Gamma-rays with energies from the MeV to the EeV band are therefore central to multiwavelength and multi-messenger studies to everything from astroparticle physics with compact objects, to dark matter studies with diffuse large scale structure.These science goals and the excitement of new discoveries have generated a wave of new gamma-ray facility proposals and programs. Since the legacy of existing facilities is well covered in many other places, this paper highlights new and proposed gamma-ray technologies and facilities that have each been designed to address specific needs in the measurement of extreme astrophysical sources that probe some of the most pressing questions in fundamental physics for the next decade. The proposed instrumentation would also address the priorities laid out in the recent Decadal Survey of Astronomy and Astrophysics (Astro2020), a complementary study by the astrophysics community that provides opportunities also relevant to Snowmass.

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Gamma-Ray Sensitivity to Dark Matter Subhalo Modelling at High Latitudes

Cited by 21 publications

References 49 publications

Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT

Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT

Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $γ$-ray signals

The Future of Gamma-Ray Experiments in the MeV-EeV Range

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