Magicc haloes: Confronting simulations with observations of the circumgalactic medium at z=0

G. S. Stinson, C. Brook, J. Xavier Prochaska, Joe Hennawi, Sijing Shen, J. Wadsley, Andrew Pontzen, H. M.P. Couchman, T. Quinn, Andrea V. Macciò, Brad K. Gibson

Research output: Contribution to journalArticle

Abstract

We explore the circumgalactic medium (CGM) of two simulated star-forming galaxies with luminosities L ≈ 0.1 and 1L {star operator} 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 Ovi absorption. The simulations do not yet address the question of what happens to the Ovi when the galaxies stop forming stars. Our models also predict a reservoir of cool Hi 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 Ovi and Hi gas in the CGM to reproduce the observed distributions. In separate analyses, these same MF models also show better agreement with other galaxy observables (e.g. rotation curves, surface brightness profiles and Hi gas distribution). We infer that the CGM is the dominant reservoir of baryons for galaxy haloes.

Original languageEnglish (US)
Pages (from-to)1270-1277
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume425
Issue number2
DOIs
StatePublished - Sep 11 2012

Keywords

  • Galaxies: evolution
  • Intergalactic medium
  • Methods: miscellaneous

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    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. (2012). Magicc haloes: Confronting simulations with observations of the circumgalactic medium at z=0. Monthly Notices of the Royal Astronomical Society, 425(2), 1270-1277. https://doi.org/10.1111/j.1365-2966.2012.21522.x