Journal Article

Hot gas haloes around disc galaxies: O <span class="smallCaps">vii</span> column densities from galaxy formation simulations

E. Ntormousi and J. Sommer-Larsen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 409, issue 3, pages 1049-1056
Published in print December 2010 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI:

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Numerical models of disc galaxy formation predict the existence of extended, hot (T∼ 106 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.

Keywords: galaxies: formation; galaxies: haloes; galaxies: spiral; X-rays: galaxies

Journal Article.  4970 words.  Illustrated.

Subjects: Astronomy and Astrophysics