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

Authors :
Jesper Sommer-Larsen
Evangelia Ntormousi
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.

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