We analyse the IllustrisTNG simulations to study the mass, volume fraction, and phase distribution of gaseous baryons embedded in the knots, filaments, sheets, and voids of the Cosmic Web from redshift z = 8 to redshift z = 0. We find that filaments host more star-forming gas than knots, and that filaments also have a higher relative mass fraction of gas in this phase than knots. We also show that the cool, diffuse intergalactic medium [IGM; $Tlt 105 , m K$, $n- m Hlt 10-4(1+z) , m cm-3$] and the warm-hot intergalactic medium [WHIM; $105 lt Tlt 107 , m K$, $n- m H lt 10-4(1+z), m cm-3$] constitute $sim 39$ and $sim 46 m per cent$ of the baryons at redshift z = 0, respectively. Our results indicate that the WHIM may constitute the largest reservoir of missing baryons at redshift z = 0. Using our Cosmic Web classification, we predict the WHIM to be the dominant baryon mass contribution in filaments and knots at redshift z = 0, but not in sheets and voids where the cool, diffuse IGM dominates. We also characterize the evolution of WHIM and IGM from redshift z = 4 to redshift z = 0, and find that the mass fraction of WHIM in filaments and knots evolves only by a factor of ∼2 from redshift z = 0 to 1, but declines faster at higher redshift. The WHIM only occupies $4!-!11 m per cent$ of the volume at redshift 0 ≤ z ≤ 1. We predict the existence of a significant number of currently undetected O vii and Ne ix absorption systems in cosmic filaments, which could be detected by future X-ray telescopes like Athena.
Titolo: | Baryons in the Cosmic Web of IllustrisTNG - I: Gas in knots, filaments, sheets, and voids |
Autore/i: | Martizzi D.; Vogelsberger M.; Artale M. C.; Haider M.; Torrey P.; Marinacci F.; Nelson D.; Pillepich A.; Weinberger R.; Hernquist L.; Naiman J.; Springel V. |
Autore/i Unibo: | |
Anno: | 2019 |
Rivista: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1093/mnras/stz1106 |
Abstract: | We analyse the IllustrisTNG simulations to study the mass, volume fraction, and phase distribution of gaseous baryons embedded in the knots, filaments, sheets, and voids of the Cosmic Web from redshift z = 8 to redshift z = 0. We find that filaments host more star-forming gas than knots, and that filaments also have a higher relative mass fraction of gas in this phase than knots. We also show that the cool, diffuse intergalactic medium [IGM; $Tlt 105 , m K$, $n- m Hlt 10-4(1+z) , m cm-3$] and the warm-hot intergalactic medium [WHIM; $105 lt Tlt 107 , m K$, $n- m H lt 10-4(1+z), m cm-3$] constitute $sim 39$ and $sim 46 m per cent$ of the baryons at redshift z = 0, respectively. Our results indicate that the WHIM may constitute the largest reservoir of missing baryons at redshift z = 0. Using our Cosmic Web classification, we predict the WHIM to be the dominant baryon mass contribution in filaments and knots at redshift z = 0, but not in sheets and voids where the cool, diffuse IGM dominates. We also characterize the evolution of WHIM and IGM from redshift z = 4 to redshift z = 0, and find that the mass fraction of WHIM in filaments and knots evolves only by a factor of ∼2 from redshift z = 0 to 1, but declines faster at higher redshift. The WHIM only occupies $4!-!11 m per cent$ of the volume at redshift 0 ≤ z ≤ 1. We predict the existence of a significant number of currently undetected O vii and Ne ix absorption systems in cosmic filaments, which could be detected by future X-ray telescopes like Athena. |
Data stato definitivo: | 2020-01-13T12:34:25Z |
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