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Hot gas haloes around disc galaxies: O vii column densities from galaxy formation simulations
- Source :
- Monthly Notices of the Royal Astronomical Society. 409:1049-1056
- Publication Year :
- 2010
- Publisher :
- Oxford University Press (OUP), 2010.
-
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.
- Subjects :
- Physics
media_common.quotation_subject
Milky Way
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Disc galaxy
Column (database)
Galaxy
Luminosity
Space and Planetary Science
Sky
Galaxy formation and evolution
Halo
Astrophysics::Galaxy Astrophysics
media_common
Subjects
Details
- ISSN :
- 00358711
- Volume :
- 409
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi...........2eb28c25bd9a38e57acc5ffa245d5cd6
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2010.17362.x