Zooming in on the circumgalactic medium with GIBLE

• Verfasst von: Ramesh, Rahul [VerfasserIn]
• Verfasst von: Nelson, Dylan [VerfasserIn]
• Verfasst von: Fielding, Drummond [VerfasserIn]
• Verfasst von: Brüggen, Marcus [VerfasserIn]
• Titel: Zooming in on the circumgalactic medium with GIBLE
• Titelzusatz: the topology and draping of magnetic fields around cold clouds : letter to the editor
• Verf.angabe: Rahul Ramesh, Dylan Nelson, Drummond Fielding, and Marcus Brüggen
• E-Jahr: 2024
• Jahr: April 2024
• Umfang: 6 S.
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 23.10.2024
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2024
• Band/Heft Quelle: 684(2024) vom: Apr., Artikel-ID L16, Seite 1-6
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/202348786
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1906660794

Abstract

We used a cosmological zoom-in simulation of a Milky Way-like galaxy to study and quantify the topology of magnetic field lines around cold gas clouds in the circumgalactic medium (CGM). This simulation is a new addition to Project GIBLE, a suite of cosmological magnetohydrodynamic simulations of galaxy formation with preferential super-Lagrangian refinement in the CGM, reaching an unprecedented CGM gas mass resolution of ∼225 M⊙. To maximize statistics and resolution, we focused on a sample of ∼200 clouds with masses of ∼106 M⊙. The topology of magnetic field lines around clouds is diverse, from threading to draping, and there is large variation in the magnetic curvature (κ) within cloud-background interfaces. We typically find little variation of κ between upstream and downstream cloud faces, implying that strongly draped configurations are rare. In addition, κ correlates strongly with multiple properties of the interface and the ambient background, including cloud overdensity and relative velocity, suggesting that cloud properties impact the topology of interface magnetic fields.