SPH P3MG Simulations of the Lyman-alpha Forest

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dc.creatorWadsley, J. W.
dc.creatorBond, J. Richard
dc.date1996-12-15
dc.date.accessioned2026-07-07T02:22:34Z
dc.date.available2026-07-07T02:22:34Z
dc.descriptionOur understanding of the Lyman-$α$ forest has received a great boost with the advent of the Keck Telescope and large 3D hydrodynamical simulations. We present new simulations using the SPH technique with a P^3MG (Particle-Particle Particle-MultiGrid) non-periodic gravity solver. Our method employs a high resolution (1 kpc) inner volume, essential for capturing the complex gas physics, a larger low resolution volume, essential for correct larger scale tidal fields and a self-consistently applied, uniform tidal field to model the influence of ultra long waves. We include a photoionizing UV flux and relevant atomic cooling processes. We use constrained field realisations to probe a selection of environments and construct a statistical sample representative of the wider universe. We generate artificial Lyman-$α$ spectra and fit Voigt profiles. We examine the importance of (1) the photoionizing flux level and history, (2) tidal environment and (3) differing cosmologies, including CDM and CDM+{$Λ$}. With an appropriate choice for the UV flux, we find that the data is fit quite well if the rms density contrast is $\sim$ 1 at $z\sim 3$ on galaxy scales.
dc.description9 pages, 4 Postscript figures, uses paspconf.sty (included), to appear in "Computational Astrophysics", Proc. 12th Kingston Conference, Halifax, Oct. 1996, ed. D. Clarke & M. West (PASP), also available from anonymous ftp site: ftp://ftp.cita.utoronto.ca/ftp/cita/bond/kingston/
dc.identifierhttps://arxiv.org/abs/astro-ph/9612148
dc.identifierhttp://arxiv.org/abs/astro-ph/9612148
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10925
dc.subjectAstrophysics
dc.titleSPH P3MG Simulations of the Lyman-alpha Forest
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