Mushroom-shaped Structures as Tracers of Buoyant Flow in the Galactic Disk | Zendy

Miguel A. de Avillez | Zendy; MordecaiMark Mac Low | Zendy

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Mushroom-shaped Structures as Tracers of Buoyant Flow in the Galactic Disk

Author(s) -

Miguel A. de Avillez,

MordecaiMark Mac Low

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/319842

Subject(s) - supernova , astrophysics , disc , physics , flow (mathematics) , thick disk , astronomy , galaxy , mechanics , galaxy formation and evolution , halo

Recent HI emission observations of the Southern Galactic hemisphere haverevealed a mushroom-like structure extending from z=-70 to -450 pc, composed ofa stem and a cap. Similar structures occur in three-dimensional simulations ofa dynamic galactic disk driven by isolated and clustered supernovae. Usingthese simulations, we show that hot gas in the Galactic disk that is notevacuated through chimneys expands into the cooler gas of the thick disk,forming mushroom-shaped structures. This new class of objects traces buoyantflow of hot gas into the thick disk.Comment: Accepted for publication in ApJ Letters. Latex manuscript, 3 figures (4 postsript files

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