%0 Generic %1 tramonte2020neutral %A Tramonte, Denis %A Ma, Yin-Zhe %D 2020 %K library %T The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps %U http://arxiv.org/abs/2009.02387 %X We detect the neutral hydrogen (HI) radial brightness temperature profile in large-scale haloes by stacking 48,430 galaxies selected from the 2dFGRS catalogue onto a set of 21-cm intensity maps obtained with the Parkes radio telescope, spanning a total area of $\sim$1,300 $deg^2$ on the sky and covering the redshift range $0.06z0.10$. Maps are obtained by removing both 10 and 20 foreground modes in the principal component analysis. We perform the stack at the map level and extract the profile from a circularly symmetrised version of the halo emission. We detect the HI halo emission with the significance $12.5\sigma$ for the 10-mode and $13.5\sigma$ for the 20-mode removed maps at the profile peak. We jointly fit for the observed halo mass $M_v$ and the normalisation $c_0,HI$ for the HI concentration parameter against the reconstructed profiles, using functional forms for the HI halo abundance proposed in the literature. We find $łog_10(M_\rm v/M_ødot) = 16.1^+0.1_-0.2$, $c_0,HI=3.5^+0.7_-1.0$ for the 10-mode and $łog_10(M_v/M_ødot) = 16.5^+0.1_-0.2$, $c_0,HI=5.3^+1.1_-1.7$ for the 20-mode removed maps. These estimates show the detection of the integrated contribution from multiple galaxies located inside very massive haloes. We also consider sub-samples of 13,979 central and 34,361 satellite 2dF galaxies separately, and obtain marginal differences suggesting satellite galaxies are HI-richer. This work shows for the first time the feasibility of testing theoretical models for the HI halo content directly on profiles extracted from 21-cm maps and opens future possibilities for exploiting upcoming HI intensity-mapping data.

@misc{tramonte2020neutral, abstract = {We detect the neutral hydrogen (HI) radial brightness temperature profile in large-scale haloes by stacking 48,430 galaxies selected from the 2dFGRS catalogue onto a set of 21-cm intensity maps obtained with the Parkes radio telescope, spanning a total area of $\sim$1,300 $\text{deg}^2$ on the sky and covering the redshift range $0.06\lesssim z\lesssim 0.10$. Maps are obtained by removing both 10 and 20 foreground modes in the principal component analysis. We perform the stack at the map level and extract the profile from a circularly symmetrised version of the halo emission. We detect the HI halo emission with the significance $12.5\sigma$ for the 10-mode and $13.5\sigma$ for the 20-mode removed maps at the profile peak. We jointly fit for the observed halo mass $M_{\rm v}$ and the normalisation $c_{0,\rm HI}$ for the HI concentration parameter against the reconstructed profiles, using functional forms for the HI halo abundance proposed in the literature. We find $\log_{10}{(M_{\rm v}/\text{M}_{\odot})} = 16.1^{+0.1}_{-0.2}$, $c_{0,\rm HI}=3.5^{+0.7}_{-1.0}$ for the 10-mode and $\log_{10}{(M_{\rm v}/\text{M}_{\odot})} = 16.5^{+0.1}_{-0.2}$, $c_{0,\rm HI}=5.3^{+1.1}_{-1.7}$ for the 20-mode removed maps. These estimates show the detection of the integrated contribution from multiple galaxies located inside very massive haloes. We also consider sub-samples of 13,979 central and 34,361 satellite 2dF galaxies separately, and obtain marginal differences suggesting satellite galaxies are HI-richer. This work shows for the first time the feasibility of testing theoretical models for the HI halo content directly on profiles extracted from 21-cm maps and opens future possibilities for exploiting upcoming HI intensity-mapping data.}, added-at = {2020-09-08T09:18:11.000+0200}, author = {Tramonte, Denis and Ma, Yin-Zhe}, biburl = {https://www.bibsonomy.org/bibtex/2f211e36542c6bf472151ab50108ce2b7/gpkulkarni}, description = {The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps}, interhash = {19958da4e7a5eb92e0f659fdbe500149}, intrahash = {f211e36542c6bf472151ab50108ce2b7}, keywords = {library}, note = {cite arxiv:2009.02387Comment: 20 pages, 13 figures. Accepted for publication in MNRAS}, timestamp = {2020-09-08T09:18:11.000+0200}, title = {The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps}, url = {http://arxiv.org/abs/2009.02387}, year = 2020 }