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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660646.0, MPI für Astronomie / Publikationen_mpia
MAGICC haloes: confronting simulations with observations of the circumgalactic medium at z=0
Authors:Stinson, G. S.; Brook, C.; Prochaska, J. X.; Hennawi, J.; Shen, S.; Wadsley, J.; Pontzen, A.; Couchman, H. M. P.; Quinn, T.; Macciò, A. V.; Gibson, B. K.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Issue / Number:2
Start Page:1270
End Page:1277
Audience:Not Specified
Abstract / Description:We explore the circumgalactic medium (CGM) of two simulated star-forming galaxies with luminosities L ≈ 0.1 and 1 L⋆ generated using the smooth particle hydrodynamic code GASOLINE. These simulations are part of the Making Galaxies In a Cosmological Context (MAGICC) program in which the stellar feedback is tuned to match the stellar mass-halo mass relationship. For comparison, each galaxy was also simulated using a 'lower feedback' (LF) model which has strength comparable to other implementations in the literature. The 'MAGICC feedback' (MF) model has a higher incidence of massive stars and an approximately two times higher energy input per supernova. Apart from the low-mass halo using LF, each galaxy exhibits a metal-enriched CGM that extends to approximately the virial radius. A significant fraction of this gas has been heated in supernova explosions in the disc and subsequently ejected into the CGM where it is predicted to give rise to substantial O VI absorption. The simulations do not yet address the question of what happens to the O VI when the galaxies stop forming stars. Our models also predict a reservoir of cool H I clouds that show strong Lyα absorption to several hundred kpc. Comparing these models to recent surveys with the Hubble Space Telescope, we find that only the MF models have sufficient O VI and H I gas in the CGM to reproduce the observed distributions. In separate analyses, these same
Free Keywords:methods: miscellaneous; galaxies: evolution; intergalactic medium
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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