Abstract
ABSTRACT Cosmological growth can be measured in the redshift space clustering of galaxies targeted by spectroscopic surveys. Accurate prediction of clustering of galaxies will require understanding galaxy physics, which is a very hard and highly non-linear problem. Approximate models of redshift space distortion (RSD) take a perturbative approach to solve the evolution of dark matter and galaxies in the universe. In this paper, we focus on extended Baryon Oscillation Spectroscopic (eBOSS) emission line galaxies (ELGs) that live in intermediate mass haloes. We create a series of mock catalogues using haloes from the Multidark and outer rim dark matter only N-body simulations. Our mock catalogues include various effects inspired by baryonic physics such as assembly bias and the characteristics of satellite galaxies kinematics, dynamics, and statistics deviating from dark matter particles. We analyse these mocks using the TNS RSD model in Fourier space and the convolution Lagrangian perturbation theory (CLPT) in configuration space. We conclude that these two RSD models provide an unbiased measurement of RSD within the statistical error of our mocks. We obtain the conservative theoretical systematic uncertainty of $3.3{{\ \rm per\ cent}}$, $1.8{{\ \rm per\ cent}}$, and $1.5{{\ \rm per\ cent}}$ in fσ8, α∥, and α⊥, respectively, for the TNS and CLPT models. We note that the estimated theoretical systematic error is an order of magnitude smaller than the statistical error of the eBOSS ELG sample and hence are negligible for the purpose of the current eBOSS ELG analysis.
Highlights
One fundamental consideration in all astronomical studies has remained the same since the begining of astronomy
In this paper we only show the full analysis done on a subsample of Star forming HOD (SFHOD) models, which complements and enhances the parameter space covered by the Standard HOD model (SHOD) and High Mass Quenched model (HMQ) models
We show the results of fitting the MultiDark and the Outer Rim mocks with the two redshift space distortion (RSD) models introduced in § 3, the TNS model (Fourier space) and the Convolution Lagrangian Perturbation Theory (CLPT)-GSRSD model
Summary
One fundamental consideration in all astronomical studies has remained the same since the begining of astronomy. In the era of large spectroscopic follow-up (Percival et al 2004; Schlegel et al 2009; Blake et al 2011; Beutler et al 2012; de la Torre et al 2013; Liske et al 2015; Dawson et al 2016), another important metric one has to consider is the ability to measure the redshift of galaxies. In general this is a function of the line-flux/features in the galaxy spectral energy distribution (SED) widely known as galaxy spectrum. Cosmological surveys are targeting star-forming ELGs for massive spectroscopic surveys (Comparat et al 2013a) at z ≈ 0.5 − 2, as:
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