The HI content of dark matter haloes at z ≈ 0 fromALFALFA
We combine information from the clustering of H I galaxies in the 100 per cent data release of the Arecibo Legacy Fast ALFA survey, and from the HI content of optically selected galaxy groups found in the Sloan Digital Sky Survey to constrain the relation between halo mass M and its average total HI...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/193641 |
| Acceso en línea: | http://hdl.handle.net/10261/193641 |
| Access Level: | acceso abierto |
| Palabra clave: | Large-scale structure of the universe Cosmology: observations Galaxies: haloes Methods: data analysis |
| Sumario: | We combine information from the clustering of H I galaxies in the 100 per cent data release of the Arecibo Legacy Fast ALFA survey, and from the HI content of optically selected galaxy groups found in the Sloan Digital Sky Survey to constrain the relation between halo mass M and its average total HI mass content M. We model the abundance and clustering of neutral hydrogen through a halo-model-based approach, parametrizing theM(Mh) relation as a power law with an exponential mass cut-off. To break the degeneracy between the amplitude and low-mass cut-off of the M(M) relation, we also include a recent measurement of the cosmic HI abundance from the α.100 sample. We find that all data sets are consistent with a power-law index α = 0.48 ± 0.08 and a cut-off halo mass logM/(hM) = 11.18. We compare these results with predictions from state-of-the-art magnetohydrodynamical simulations, and find both to be in good qualitative agreement, although the data favours a significantly larger cut-off mass that is consistent with the higher cosmic HI abundance found in simulations. Both data and simulations seem to predict a similar value for the HI bias (b = 0.878) and shot-noise power (P = 94 [h Mpc]) at redshift z = 0.© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. |
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