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Verfasst von:Ramesh, Rahul [VerfasserIn]   i
 Nelson, Dylan [VerfasserIn]   i
 Pillepich, Annalisa [VerfasserIn]   i
Titel:The circumgalactic medium of Milky Way-like galaxies in the TNG50 simulation - I
Titelzusatz:halo gas properties and the role of SMBH feedback
Verf.angabe:Rahul Ramesh, Dylan Nelson and Annalisa Pillepich
E-Jahr:2023
Jahr:February 2023
Umfang:24 S.
Fussnoten:Online veröffentlicht 2022 December 2 ; Gesehen am 27.03.2023
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2023
Band/Heft Quelle:518(2023), 4 vom: Feb., Seite 5754-5777
ISSN Quelle:1365-2966
Abstract:We analyse the physical properties of gas in the circumgalactic medium (CGM) of 132 Milky Way (MW)-like galaxies at z = 0 from the cosmological magneto-hydrodynamical simulation TNG50, part of the IllustrisTNG project. The properties and abundance of CGM gas across the sample are diverse, and the fractional budgets of different phases (cold, warm, and hot), as well as neutral H i mass and metal mass, vary considerably. Over our stellar mass range of $10^{10.5} < M_\star /{\rm M}_\odot < 10^{10.9}$, radial profiles of gas physical properties from $0.15 < R/R_{\rm 200c} < 1.0$ reveal great CGM structural complexity, with significant variations both at fixed distance around individual galaxies, and across different galaxies. CGM gas is multiphase: the distributions of density, temperature, and entropy are all multimodal, while metallicity and thermal pressure distributions are unimodal; all are broad. We present predictions for magnetic fields in MW-like haloes: a median field strength of $|B|\sim 1\,\mu{\rm G}$ in the inner halo decreases rapidly at larger distance, while magnetic pressure dominates over thermal pressure only within ${\sim}0.2 \times R_{\rm 200c}$. Virial temperature gas at ${\sim}10^6\,{\rm K}$ coexists with a subdominant cool, $\lt 10^5\,{\rm K}$, component in approximate pressure equilibrium. Finally, the physical properties of the CGM are tightly connected to the galactic star formation rate, in turn dependent on feedback from supermassive black holes (SMBHs). In TNG50, we find that energy from SMBH-driven kinetic winds generates high-velocity outflows (≳500-2000 km s−1), heats gas to supervirial temperatures (>106.5-7 K), and regulates the net balance of inflows versus outflows in otherwise quasi-static gaseous haloes.
DOI:doi:10.1093/mnras/stac3524
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1093/mnras/stac3524
 DOI: https://doi.org/10.1093/mnras/stac3524
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1840135298
Verknüpfungen:→ Zeitschrift

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