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New Fitting Formula for Cosmic Nonlinear Density Distribution
Shin, Jihye,Kim, Juhan,Pichon, Christophe,Jeong, Donghui,Park, Changbom American Astronomical Society 2017 The Astrophysical journal Vol.843 No.1
<P>We have measured the probability distribution function (PDF) of a cosmic matter density field from a suite of N-body simulations. We propose the generalized normal distribution of version 2 (N-v2) as an alternative fitting formula to the well-known log-normal distribution. We find that N-v2 provides a significantly better fit than that of the log-normal distribution for all smoothing radii (2, 5, 10, 25 [Mpc h(-1)]) that we studied. The improvement is substantial in the underdense regions. The development of non-Gaussianities in the cosmic matter density field is captured by continuous evolution of the skewness and shift parameters of the N-v2 distribution. We present the redshift evolution of these parameters for aforementioned smoothing radii and various background cosmology models. All the PDFs measured from large and high-resolution N-body simulations that we use in this study can be obtained from the web site https://astro.kias.re.kr/jhshin.</P>
The Horizon-AGN simulation: morphological diversity of galaxies promoted by AGN feedback
Dubois, Yohan,Peirani, Sé,bastien,Pichon, Christophe,Devriendt, Julien,Gavazzi, Raphaë,l,Welker, Charlotte,Volonteri, Marta Oxford University Press 2016 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.463 No.4