X-Ray Isophote Shapes and the Dark Matter Halo of NGC 3923
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The Xray isophote shapes of elliptical galaxies probe both the shape and radialdistribution of the gravitating mass essentially independently of th temperatureprofile of the hot gas. We propose to observe the elliptical NGC 3923 with XMMto obtain accurate measurements of the ellipticity of the Xray emissionextending out to the faintest isophotes detected with the ROSAT PSPC (10 arcmin,virgul90 kpc) whereas ROSAT only obtained useful ellipticity constraints within 1.5arcmin. Consequently, our XMM observation will definitively answer the questionsof whether the mass is more elongated than the stars and whether the radialmass density profile is shallower than the CDM NFW profile. These results willthus provide important tests of cosmological theories of structure formation. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]
