The Lyman-α forest as a diagnostic of the nature of the dark matter
| Autor: | Antonella Garzilli, Andrii Magalich, Christoph Weniger, Tom Theuns, Oleg Ruchayskiy, Carlos S. Frenk, Alexey Boyarsky |
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| Přispěvatelé: | GRAPPA (ITFA, IoP, FNWI) |
| Rok vydání: | 2019 |
| Předmět: |
Sterile neutrino
Cold dark matter absorption lines [quasars] media_common.quotation_subject Dark matter Flux Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 7. Clean energy 01 natural sciences Spectral line dark matter 0103 physical sciences data analysis [methods] 010303 astronomy & astrophysics Computer Science::Databases media_common Physics 010308 nuclear & particles physics Astronomy and Astrophysics Free streaming methods: data analysis Redshift Universe quasars: absorption lines High Energy Physics - Phenomenology 13. Climate action Space and Planetary Science intergalactic medium large-scale structure of Universe Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Monthly notices of the Royal Astronomical Society, 2019, Vol.489(3), pp.3456-3471 [Peer Reviewed Journal] Monthly Notices of the Royal Astronomical Society, 489(3), 3456-3471 Garzilli, A, Magalich, A, Theuns, T, Frenk, C S, Weniger, C, Ruchayskiy, O & Boyarsky, A 2019, ' The Lyman-alpha forest as a diagnostic of the nature of the dark matter ', Monthly Notices of the Royal Astronomical Society, vol. 489, no. 3, pp. 3456-3471 . https://doi.org/10.1093/mnras/stz2188 Monthly Notices of the Royal Astronomical Society, 489(3), 3456-3471. Oxford University Press Monthly Notices of the Royal Astronomical Society |
| ISSN: | 0035-8711 |
| DOI: | 10.1093/mnras/stz2188 |
| Popis: | The observed Lyman-$\alpha$ flux power spectrum (FPS) is suppressed on scales below $\sim~ 30~{\rm km~s}^{-1}$. This cutoff could be due to the high temperature, $T_0$, and pressure, $p_0$, of the absorbing gas or, alternatively, it could reflect the free streaming of dark matter particles in the early universe. We perform a set of very high resolution cosmological hydrodynamic simulations in which we vary $T_0$, $p_0$ and the amplitude of the dark matter free streaming, and compare the FPS of mock spectra to the data. We show that the location of the dark matter free-streaming cutoff scales differently with redshift than the cutoff produced by thermal effects and is more pronounced at higher redshift. We, therefore, focus on a comparison to the observed FPS at $z>5$. We demonstrate that the FPS cutoff can be fit assuming cold dark matter, but it can be equally well fit assuming that the dark matter consists of $\sim 7$ keV sterile neutrinos in which case the cutoff is due primarily to the dark matter free streaming. Comment: 16 pages, 11 figures |
| Databáze: | OpenAIRE |
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