Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-07-23
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
accepted for publication in MNRAS
Scientific paper
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.
Ntormousi Evangelia
Sommer-Larsen Jesper
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