Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
| Autor: | Gernot Maier, Moritz Hütten, Céline Combet, David Maurin |
|---|---|
| Přispěvatelé: | Humboldt-Universität zu Berlin, Deutsches Elektronen-Synchrotron [Zeuthen] (DESY), Helmholtz-Gemeinschaft = Helmholtz Association, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Cherenkov Telescope Array Cosmology and Nongalactic Astrophysics (astro-ph.CO) Milky Way Astrophysics::High Energy Astrophysical Phenomena Dark matter halo FOS: Physical sciences Astrophysics hierarchy Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences programming annihilation [dark matter] GLAST Luminosity Angular diameter 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics ddc:530 structure numerical calculations white dwarf 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics High Energy Astrophysical Phenomena (astro-ph.HE) angular dependence [power spectrum] 010308 nuclear & particles physics formation Astronomy and Astrophysics sensitivity Galaxy Dwarf spheroidal galaxy galaxy Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Cosmology and Nongalactic Astrophysics Fermi Gamma-ray Space Telescope |
| Zdroj: | Journal of cosmology and astroparticle physics (2016). doi:10.3204/PUBDB-2017-00824 Journal of Cosmology and Astroparticle Physics Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2016, 09, pp.047. ⟨10.1088/1475-7516/2016/09/047⟩ |
| ISSN: | 1475-7508 1475-7516 |
| DOI: | 10.48550/arxiv.1606.04898 |
| Popis: | Hierarchical structure formation leads to a clumpy distribution of dark matter in the Milky Way. These clumps are possible targets to search for dark matter annihilation with present and future $\gamma$-ray instruments. Many uncertainties exist on the clump distribution, leading to disputed conclusions about the expected number of detectable clumps and the ensuing limits that can be obtained from non-detection. In this paper, we use the CLUMPY code to simulate thousands of skymaps for several clump distributions. This allows us to statistically assess the typical properties (mass, distance, angular size, luminosity) of the detectable clumps. Varying parameters of the clump distributions allows us to identify the key quantities to which the number of detectable clumps is the most sensitive. Focusing our analysis on two extreme clump configurations, yet consistent with results from numerical simulations, we revisit and compare various calculations made for the Fermi-LAT instrument, in terms of number of dark clumps expected and the angular power spectrum for the Galactic signal. We then focus on the prospects of detecting dark clumps with the future CTA instrument, for which we make a detailed sensitivity analysis using open-source CTA software. Based on a realistic scenario for the foreseen CTA extragalactic survey, and accounting for a post-trial sensitivity in the survey, we show that we obtain competitive and complementary limits to those based on long observation of a single bright dwarf spheroidal galaxy. Comment: 29 pages + appendix, 15 figures. V2: Sects. 3.3, 4, and 5.3 extended, results unchanged (matching accepted JCAP version) |
| Databáze: | OpenAIRE |
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