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28 March 2024
 
  » arxiv » 1605.5352

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Linear redshift space distortions for cosmic voids based on galaxies in redshift space
Chia-Hsun Chuang ; Francisco-Shu Kitaura ; Yu Liang ; Andreu Font-Ribera ; Cheng Zhao ; Patrick McDonald ; Charling Tao ;
Date 17 May 2016
AbstractCosmic voids found in galaxy surveys are defined based on the galaxy distribution in redshift space. We show that the large scale distribution of voids in redshift space traces the fluctuations in the dark matter density field delta(k) (in Fourier space with mu being the line of sight projected k-vector): delta_v^s(k) = (1 + eta_v mu^2) b^s_v delta(k), with a beta factor that will be in general different than the one describing the distribution of galaxies. Only in case voids could be assumed to be quasi-local transformations of the linear (Gaussian) galaxy redshift space field, one gets equal beta factors eta_v=eta_g=f/b_g with f being the growth rate, and b_g, b^s_v being the galaxy and void bias on large scales defined in redshift space. Indeed, in our mock void catalogs we measure void beta factors being in good agreement with the galaxy one. Further work needs to be done to confirm the level of accuracy of the beta factor equality between voids and galaxies, but in general the void beta factor needs to be considered as a free parameter for RSD studies.
Source arXiv, 1605.5352
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