HI content at cosmic noon -- a millimeter-wavelength perspective
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913229320486912 |
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| author | Messias, Hugo Guerrero, Andrea Nagar, Neil Regueiro, Jack Impellizzeri, Violette Orellana, Gustavo Vioque, Miguel |
| author_facet | Messias, Hugo Guerrero, Andrea Nagar, Neil Regueiro, Jack Impellizzeri, Violette Orellana, Gustavo Vioque, Miguel |
| contents | In order to understand galaxy growth evolution, it is critical to constrain the evolution of its building block: gas. Mostly comprised by Hydrogen in its neutral (HI) and molecular (H2) phases, the latter is the one mostly directly associated to star-formation, while the neutral phase is considered the long-term gas reservoir. In this work, we make use of an empirical relation between dust emission at millimeter wavelengths and total gas mass in the inter-stellar medium (M_HI plus M_H2) in order to retrieve the HI content in galaxies. We assemble an heterogeneous sample of 335 galaxies at 0.01<z<6.4 detected in both mm-continuum and carbon monoxide (CO), with special focus on a blindly selected sample to retrieve HI cosmological content when the Universe was ~2-6Gyr old (1<z<3). We find no significant evolution with redshift of the M_HI/M_H2 ratio, which is about 1-3 (depending on the relation used to estimate M_HI). This also shows that M_H2-based gas depletion times are underestimated overall by a factor of 2-4. Compared to local Universe HI mass functions, we find that the number density of galaxies with M_HI>1E10.5M_sun significantly decreased since 8-12Gyr ago. The specific sample used for this analysis is associated to 20-50% of the total cosmic HI content as estimated via Damped Lyman-alpha Absorbers. In IR luminous galaxies, HI mass content decreases between z~2.5 and z~1.5, while H2 seems to increase. We also show source detection expectations for SKA surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_02782 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | HI content at cosmic noon -- a millimeter-wavelength perspective Messias, Hugo Guerrero, Andrea Nagar, Neil Regueiro, Jack Impellizzeri, Violette Orellana, Gustavo Vioque, Miguel Astrophysics of Galaxies In order to understand galaxy growth evolution, it is critical to constrain the evolution of its building block: gas. Mostly comprised by Hydrogen in its neutral (HI) and molecular (H2) phases, the latter is the one mostly directly associated to star-formation, while the neutral phase is considered the long-term gas reservoir. In this work, we make use of an empirical relation between dust emission at millimeter wavelengths and total gas mass in the inter-stellar medium (M_HI plus M_H2) in order to retrieve the HI content in galaxies. We assemble an heterogeneous sample of 335 galaxies at 0.01<z<6.4 detected in both mm-continuum and carbon monoxide (CO), with special focus on a blindly selected sample to retrieve HI cosmological content when the Universe was ~2-6Gyr old (1<z<3). We find no significant evolution with redshift of the M_HI/M_H2 ratio, which is about 1-3 (depending on the relation used to estimate M_HI). This also shows that M_H2-based gas depletion times are underestimated overall by a factor of 2-4. Compared to local Universe HI mass functions, we find that the number density of galaxies with M_HI>1E10.5M_sun significantly decreased since 8-12Gyr ago. The specific sample used for this analysis is associated to 20-50% of the total cosmic HI content as estimated via Damped Lyman-alpha Absorbers. In IR luminous galaxies, HI mass content decreases between z~2.5 and z~1.5, while H2 seems to increase. We also show source detection expectations for SKA surveys. |
| title | HI content at cosmic noon -- a millimeter-wavelength perspective |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2312.02782 |