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

E. Ntormousi; Jesper Sommer-Larsen

doi:10.1111/j.1365-2966.2010.17362.x

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

E. Ntormousi, Jesper Sommer-Larsen

4 Citationer (Scopus)

Abstract

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.

Originalsprog	Engelsk
Tidsskrift	Monthly Notices of the Royal Astron. Society
Vol/bind	409
Udgave nummer	3
Sider (fra-til)	1049-1056
Antal sider	7
DOI	https://doi.org/10.1111/j.1365-2966.2010.17362.x
Status	Udgivet - 11 dec. 2010

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10.1111/j.1365-2966.2010.17362.x

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title = "Hot gas haloes around disc galaxies: O VII column densities from galaxy formation simulations",

abstract = "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.",

author = "E. Ntormousi and Jesper Sommer-Larsen",

year = "2010",

month = dec,

day = "11",

doi = "10.1111/j.1365-2966.2010.17362.x",

language = "English",

volume = "409",

pages = "1049--1056",

journal = "Royal Astronomical Society. Monthly Notices",

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TY - JOUR

T1 - Hot gas haloes around disc galaxies

T2 - O VII column densities from galaxy formation simulations

AU - Ntormousi, E.

AU - Sommer-Larsen, Jesper

PY - 2010/12/11

Y1 - 2010/12/11

N2 - 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.

AB - 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.

U2 - 10.1111/j.1365-2966.2010.17362.x

DO - 10.1111/j.1365-2966.2010.17362.x

M3 - Journal article

SN - 0035-8711

VL - 409

SP - 1049

EP - 1056

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 3

ER -

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

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