2015/02/28 by Hamsa Padmanabhan, R. Srianand, Tirthankar Roy Choudhury +1
Environmental Science · Mathematics · Physics and Astronomy · #Astrophysics #Bar (unit) #Curvature #Distribution (mathematics) #Equation of state #Galaxies: Formation, Evolution, Phenomena #Galaxy #Geometry #Mathematical analysis #Mathematics #Meteorology #Percentile #Physics #Plant Water Relations and Carbon Dynamics #Probability density function #Quantum mechanics #Redshift #Statistical physics #Statistics #Stellar, planetary, and galactic studies #astro-ph.CO
paper · pdf · doi:10.1093/mnrasl/slv041
published as MNRAS Letters, Volume 450, Issue 1, p.L29-L33 (2015) · 5 pages, 4 figures, 1 table; version accepted for publication in MNRAS Letters
arxiv created 2015/03/09 · openalex publication_date 2015/04/02 · openalex created_date 2016/06/24 · arxiv updated 2017/08/23 · openalex updated_date 2026/08/05
Abstract Using hydrodynamical simulations, we explore the use of the mean and percentiles of the curvature distribution function to recover the equation of state of the high-z (2 < z < 4) intergalactic medium (IGM). We find that the mean and percentiles of the absolute curvature distribution exhibit tight correlation with the temperatures measured at respective characteristic overdensities Δ is at each redshift. Hence, they provide complementary probes of the same underlying temperature–density distribution, and can in principle be used to simultaneously recover both parameters T0 and γ of the IGM effective equation of state. We quantify the associated errors in the recovered parameters T0 and γ from the intrinsic scatter in the characteristic overdensities and the uncertainties in the curvature measurement.