Reconstructing the gravitational lensing potential from the Lyman-α forest
نویسندگان
چکیده
منابع مشابه
Inferring the Linear Power Spectrum from the Lyman-α Forest
We discuss the determination of the linear power spectrum of dark matter fluctuations from measurements of the transmitted flux Ly-α Forest power spectrum. We show that at most scales probed by current measurements, the flux power spectrum is significantly affected by non-linear corrections to the linear dark matter power spectrum due to gravitational clustering. Inferring the linear dark matte...
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Our understanding of the Lyman-α forest has received a great boost with the advent of the Keck Telescope and large 3D hydro-dynamical simulations. We present new simulations using the SPH technique with a P 3 MG (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...
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A new method to extract Ωb from high redshift intergalactic absorption is described, based on the distribution of HeII Lyα optical depths in the voids in the ionization zone of quasars. A preliminary estimate from recent HST-STIS spectra of PKS 1935-692 at z = 3 gives Ωb h 2 = 0.0125 −0.0014 (1-σ statistical errors, for a ΛCDM cosmology) consistent with other estimates.
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1 Institute of Astronomy, Madingley Road, CB3 0HA Cambridge, UK 2 INAF-Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34131 Trieste, Italy 3 Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ 4 Harvard-Smithsonian Center for Astrohpysics, 60 Garden Street, Cambridge, MA 02198, USA 5 Dipartimento di Fisica ‘Galileo Galilei’ e INFN Sez. di Padova, via...
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We use published measurements of the transmission power spectrum of the Lyman α forest to constrain several parameters that describe cosmology and thermal properties of the intergalactic medium (IGM). A 6 parameter grid is constructed using Particle-Mesh dark matter simulations together with scaling relations to make predictions for the gas properties. We fit for all parameters simultaneously a...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2020
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/202038056