A gas-rich cosmic web revealed by the partitioning of the missing baryons
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| Autores principales: | , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Connor, Liam Ravi, Vikram Sharma, Kritti Ocker, Stella Koch Faber, Jakob Hallinan, Gregg Harnach, Charlie Hellbourg, Greg Hobbs, Rick Hodge, David Hodges, Mark Kosogorov, Nikita Lamb, James Law, Casey Rasmussen, Paul Sherman, Myles Somalwar, Jean Weinreb, Sander Woody, David Konietzka, Ralf M. |
| author_facet | Connor, Liam Ravi, Vikram Sharma, Kritti Ocker, Stella Koch Faber, Jakob Hallinan, Gregg Harnach, Charlie Hellbourg, Greg Hobbs, Rick Hodge, David Hodges, Mark Kosogorov, Nikita Lamb, James Law, Casey Rasmussen, Paul Sherman, Myles Somalwar, Jean Weinreb, Sander Woody, David Konietzka, Ralf M. |
| contents | Approximately half of the Universe's dark matter resides in collapsed halos; significantly less than half of the baryonic matter (protons and neutrons) remains confined to halos. A small fraction of baryons are in stars and the interstellar medium within galaxies. The lion's share are diffuse ($<$10$^{-3}$ cm$^{-3}$) and ionized (neutral fraction $<$10$^{-4}$), located in the intergalactic medium (IGM) and in the halos of galaxy clusters, groups, and galaxies. This diffuse ionized gas is notoriously difficult to measure, but has wide implications for galaxy formation, astrophysical feedback, and precision cosmology. Recently, the dispersion of extragalactic Fast Radio Bursts (FRBs) has been used to measure the total content of cosmic baryons. Here, we present a large cosmological sample of FRB sources localized to their host galaxies. We have robustly partitioned the missing baryons into the IGM, galaxy clusters, and galaxies, providing a late-Universe measurement of the total baryon density of $Ω_b\,h_{70} = 0.051_{-0.006}^{+0.006}$. Our results indicate efficient feedback processes that can deplete galaxy halos and enrich the IGM ($f_{\rm IGM}=0.76_{-0.11}^{+0.10}$), agreeing with the baryon-rich cosmic web scenario seen in cosmological simulations. Our results may reduce the ``$S_8$ tension'' in cosmology, as strong feedback leads to suppression of the matter power spectrum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_16952 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A gas-rich cosmic web revealed by the partitioning of the missing baryons Connor, Liam Ravi, Vikram Sharma, Kritti Ocker, Stella Koch Faber, Jakob Hallinan, Gregg Harnach, Charlie Hellbourg, Greg Hobbs, Rick Hodge, David Hodges, Mark Kosogorov, Nikita Lamb, James Law, Casey Rasmussen, Paul Sherman, Myles Somalwar, Jean Weinreb, Sander Woody, David Konietzka, Ralf M. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena Approximately half of the Universe's dark matter resides in collapsed halos; significantly less than half of the baryonic matter (protons and neutrons) remains confined to halos. A small fraction of baryons are in stars and the interstellar medium within galaxies. The lion's share are diffuse ($<$10$^{-3}$ cm$^{-3}$) and ionized (neutral fraction $<$10$^{-4}$), located in the intergalactic medium (IGM) and in the halos of galaxy clusters, groups, and galaxies. This diffuse ionized gas is notoriously difficult to measure, but has wide implications for galaxy formation, astrophysical feedback, and precision cosmology. Recently, the dispersion of extragalactic Fast Radio Bursts (FRBs) has been used to measure the total content of cosmic baryons. Here, we present a large cosmological sample of FRB sources localized to their host galaxies. We have robustly partitioned the missing baryons into the IGM, galaxy clusters, and galaxies, providing a late-Universe measurement of the total baryon density of $Ω_b\,h_{70} = 0.051_{-0.006}^{+0.006}$. Our results indicate efficient feedback processes that can deplete galaxy halos and enrich the IGM ($f_{\rm IGM}=0.76_{-0.11}^{+0.10}$), agreeing with the baryon-rich cosmic web scenario seen in cosmological simulations. Our results may reduce the ``$S_8$ tension'' in cosmology, as strong feedback leads to suppression of the matter power spectrum. |
| title | A gas-rich cosmic web revealed by the partitioning of the missing baryons |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2409.16952 |