Modeling the large-scale bias of neutral hydrogen

Search Swinburne Research Bank

Home

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/191454

Title: Modeling the large-scale bias of neutral hydrogen
Author(s): Marin, Felipe A.; Gnedin, Nickolay Y.; Seo, Hee-Jong; Vallinotto, Alberto
Abstract: We present new analytical estimates of the large-scale bias of neutral hydrogen (HI). We use a simple, nonparametric model which monotonically relates the total mass of a halo Mtot with its H I mass M H I at zero redshift; for earlier times we assume limiting models for the ΩH I evolution consistent with the data presently available, as well as two main scenarios for the evolution of our MHI -Mtot relation. We find that both the linear and the first nonlinear bias terms exhibit a strong evolution with redshift, regardless of the specific limiting model assumed for the H I density over time. These analytical predictions are then shown to be consistent with measurements performed on the Millennium Simulation. Additionally, we show that this strong bias evolution does not sensibly affect the measurement of the H I power spectrum.
Publication type: Journal article
Source: Astrophysical Journal, Vol. 718, no. 2 (Aug 2010), pp. 972-980
Publication year: 2010
FOR Code(s): 0201 Astronomical and Space Sciences
Keyword(s): Diffuse radiation; Large-scale structure of universe
Publisher: Institute of Physics Publishing
ISSN: 0004-637X
Publisher URL: http://dx.doi.org/10.1088/0004-637x/718/2/972
Peer reviewed