%0 Generic %1 padmanabhan2016model %A Padmanabhan, Hamsa %A Refregier, Alexandre %A Amara, Adam %D 2016 %K DLA halo hydrogen model neutral %T A halo model for cosmological neutral hydrogen : abundances and clustering %U http://arxiv.org/abs/1611.06235 %X We extend the results of previous analyses towards constraining the abundance and clustering of post-reionization ($z 0-5$) neutral hydrogen (HI) systems using a halo model framework. We work with a comprehensive HI dataset including the small-scale clustering, column density and mass function of HI galaxies at low redshifts, intensity mapping measurements at intermediate redshifts and the UV/optical observations of Damped Lyman Alpha (DLA) systems at higher redshifts. We use a Markov Chain Monte Carlo (MCMC) approach to constrain the parameters of the best-fitting models, both for the HI-halo mass relation and the HI radial density profile. We find that a radial exponential profile results in a good fit to the low-redshift HI observations, including the clustering and the column density distribution. The form of the profile is also found to match the high-redshift DLA observations, when used in combination with a three-parameter HI-halo mass relation and a redshift evolution in the HI concentration. The halo model predictions are in good agreement with the observed HI surface density profiles of low-redshift galaxies, and the general trends in the the impact parameter and covering fraction observations of high-redshift DLAs. We provide convenient tables summarizing the best-fit halo model predictions.

@misc{padmanabhan2016model, abstract = {We extend the results of previous analyses towards constraining the abundance and clustering of post-reionization ($z \sim 0-5$) neutral hydrogen (HI) systems using a halo model framework. We work with a comprehensive HI dataset including the small-scale clustering, column density and mass function of HI galaxies at low redshifts, intensity mapping measurements at intermediate redshifts and the UV/optical observations of Damped Lyman Alpha (DLA) systems at higher redshifts. We use a Markov Chain Monte Carlo (MCMC) approach to constrain the parameters of the best-fitting models, both for the HI-halo mass relation and the HI radial density profile. We find that a radial exponential profile results in a good fit to the low-redshift HI observations, including the clustering and the column density distribution. The form of the profile is also found to match the high-redshift DLA observations, when used in combination with a three-parameter HI-halo mass relation and a redshift evolution in the HI concentration. The halo model predictions are in good agreement with the observed HI surface density profiles of low-redshift galaxies, and the general trends in the the impact parameter and covering fraction observations of high-redshift DLAs. We provide convenient tables summarizing the best-fit halo model predictions.}, added-at = {2016-11-22T09:35:20.000+0100}, author = {Padmanabhan, Hamsa and Refregier, Alexandre and Amara, Adam}, biburl = {https://www.bibsonomy.org/bibtex/20a4d4fa1cbde4735a785d407fa4b0bfc/miki}, description = {[1611.06235] A halo model for cosmological neutral hydrogen : abundances and clustering}, interhash = {7420144e7ec3f8dd04d8f5fac6e12ca2}, intrahash = {0a4d4fa1cbde4735a785d407fa4b0bfc}, keywords = {DLA halo hydrogen model neutral}, note = {cite arxiv:1611.06235Comment: 12 pages, 12 figures, 5 tables}, timestamp = {2016-11-22T09:35:20.000+0100}, title = {A halo model for cosmological neutral hydrogen : abundances and clustering}, url = {http://arxiv.org/abs/1611.06235}, year = 2016 }