Hot gas haloes around disc galaxies: OVII column densities from galaxy formation simulations
ABSTRACT Numerical models of disc galaxy formation predict the existence of extended, hot (T 106K) 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 fa...
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Published in | Monthly notices of the Royal Astronomical Society Vol. 409; no. 3; pp. 1049 - 1056 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Malden, MA
Wiley-Blackwell
11.12.2010
Oxford University Press |
Subjects | |
Online Access | Get full text |
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Abstract | ABSTRACT Numerical models of disc galaxy formation predict the existence of extended, hot (T 106K) 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 Ovii 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.[PUBLICATION ABSTRACT] |
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AbstractList | ABSTRACT Numerical models of disc galaxy formation predict the existence of extended, hot (T 106K) 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 Ovii 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.[PUBLICATION ABSTRACT] |
Author | SOMMER-LARSEN, J NTORMOUSI, E |
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Keywords | Galaxy halo X-ray galaxies Digital simulation X-rays: galaxies Disk galaxies Cosmic x-ray sources Luminosity N body system Column density Galactic disks Density distribution Milky Way galaxies: formation Upper bound Galaxy formation Spiral galaxies Hot gas galaxies: spiral X ray emission galaxies: haloes |
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Title | Hot gas haloes around disc galaxies: OVII column densities from galaxy formation simulations |
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