Hot gas haloes around disc galaxies: O VII column densities from galaxy formation simulations

Abstract

Numerical models of disc galaxy formation predict the existence of extended, hot ( T~10^6 K) gas haloes around present day spirals. The X-ray luminosity of these haloes is predicted to increase strongly with galaxy mass. However, searches for their X-ray emission have not been successful so far. We calculate the all sky O VII column density distributions for the haloes of three Milky Way like disc galaxies, resulting from cosmological high-resolution, N-body/gasdynamical simulations. We perform calculations both including the disc gas and without it, so the disc contribution to the column density is quantified. It is found that the column densities estimated for Milky Way-like galaxies are just below the observational upper limit, making a test of the hot halo paradigm likely within observational reach.

accepted for publication in MNRAS

References in corpus (7)

• X-Ray Absorption from the Milky Way Halo and the Local Group
• Where are the ``Missing'' Galactic Baryons?
• A Large Reservoir of Ionized Gas in the Galactic Halo: Ionized Silicon in High-Velocity and Intermediate-Velocity Clouds
• Ongoing Galactic Accretion: Simulations and Observations of Condensed Gas in Hot Halos
• The many streams of the Magellanic Stream
• Limits on Hot Galactic Halo Gas from X-ray Absorption Lines
• The Dearth of Chemically Enriched Warm-Hot Circumgalactic Gas

Cited by in corpus (4)

• Massive Warm/Hot Galaxy Coronae as Probed by UV/X-ray Oxygen Absorption and Emission: I - Basic Model
• Massive Warm/Hot Galaxy Coronae: II. Isentropic Model
• Galactic winds - How to launch galactic outflows in typical Lyman-break galaxies
• XMM-Newton Survey of Local OVII Absorption Lines in the Spectra of Galactic X-ray Sources