Unidentified Fermi Objects in the view of H.E.S.S. -- Possible Dark Matter Clumps

Abstract

There is strong evidence about the existence of unknown dark matter in the Universe. Many different theories about this dark matter exist, but most probably it is made of a new kind of fundamental particle that has to be massive, stable, electrically neutral, and having only weak interaction with standard matter (weakly interacting massive particles). In principle, those particles could produce gamma rays by their annihilation or decay. Therefore, a Gamma-ray signal from a dark matter origin would provide one of the clearest and most concluding evidences for dark matter. High resolution cosmological N-body simulations have shown that dark matter subhalos in the Milky Way halo may developed in the Universe. Those subhalos could pop-up in gamma-ray surveys as unidentified sources. In this paper we present H.E.S.S. observations of unidentified sources selected from Fermi-LAT catalogs. These sources fulfill main features which would characterize a dark matter subhalo, namely, having no obvious counterpart at other wavelengths and being steady hard sources.

arXiv commentProceedings of the 36th International Cosmic Ray Conference, 2019, Madison, WI, USA

References in corpus (20)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Quantifying the heart of darkness with GHALO - a multi-billion particle simulation of our galactic halo
• Background Modelling in Very-High-Energy gamma-ray Astronomy
• A high performance likelihood reconstruction of gamma-rays for Imaging Atmospheric Cherenkov Telescopes
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• A Monte Carlo Template based analysis for Air-Cherenkov Arrays
• Implications of High-Resolution Simulations on Indirect Dark Matter Searches
• Fitting the Gamma-Ray Spectrum from Dark Matter with DMFIT: GLAST and the Galactic Center Region
• Detection of Neutralino Annihilation Photons from External Galaxies
• Observations of the Sagittarius Dwarf galaxy by the H.E.S.S. experiment and search for a Dark Matter signal
• Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
• The WIMP Forest: Indirect Detection of a Chiral Square
• Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
• Constraints on an Annihilation Signal from a Core of Constant Dark Matter Density around the Milky Way Center with H.E.S.S
• Constraining Dark Matter lifetime with a deep gamma-ray survey of the Perseus Galaxy Cluster with MAGIC
• Indirect dark matter searches in the dwarf satellite galaxy Ursa Major II with the MAGIC Telescopes
• Dark Matter Annihilation around Intermediate Mass Black Holes: an update
• Search for Gamma-rays from Dark Matter annihilations around Intermediate Mass Black Holes with the H.E.S.S. experiment
• Can proper motions of dark-matter subhalos be detected?
• Dark Matter Searches with the Fermi-LAT in the Direction of Dwarf Spheroidals