XMM-Newton Proposal 02046701

Details XMM-Newton Proposal 02046701 XMM-Newton Proposal 02046701

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..248b&link_type=abstract

XMM-Newton Proposal ID #02046701

Mathematics

Logic

Ms30, Xmm-Newton Proposal 02046701

Scientific paper

The detection of X-ray absorption and emission lines at z 0 has been interpreted as an extensive isothermal Local Group medium with a gaseous mass exceeding the baryonic mass of all Local Group galaxies. A large gaseous mass helps to solve the missing baryon problem , a leading cosmological issue. However, the gas mass is highly model dependent, and in an alternative model, the gas lies in a Galactic halo of size 50 kpc and with a gas mass orders of magnitude lower. We can discriminate between the Galactic Halo and Local Group models by determining whether most of the diffuse X-ray emission (0.5-1 keV) lies in front or behind a Magellanic Stream cloud at a distance of 50 kpc. For the Local Group model, the MS cloud will absorb the emission beyond it, casting an X-ray shadow .

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