Report
The Lyman-$\alpha$ forest as a diagnostic of the nature of the dark matter
| العنوان: | The Lyman-$\alpha$ forest as a diagnostic of the nature of the dark matter |
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| المؤلفون: | Garzilli, Antonella, Magalich, Andrii, Theuns, Tom, Frenk, Carlos S., Weniger, Christoph, Ruchayskiy, Oleg, Boyarsky, Alexey |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology |
| الوصف: | 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 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stz2188 |
| URL الوصول: | http://arxiv.org/abs/1809.06585 |
| رقم الانضمام: | edsarx.1809.06585 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stz2188 |
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