Galactic Fountains, Galaxy Infall, and the Dark Matter Content of NGC 891

Details Galactic Fountains, Galaxy Infall, and the Dark Matter Content of NGC 891 Galactic Fountains, Galaxy Infall, and the Dark Matter Content of NGC 891

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..152b&link_type=abstract

XMM-Newton Proposal ID #04040701

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Galaxies, Galactic Surveys, Ngc891, Xmm-Newton Proposal 04040701

Scientific paper

This program addresses two important issues through a study of the X-ray emission from hot gas around the edge-on spiral NGC891. First, we address the origin of the hot halo, which can occur by infall onto the galaxy or by a galactic fountain. We differentiate between these models by measuring the metallicity of the gas, predicted to be low in one model and high in the other. Second, we will measure the vertical component of the galaxy's gravitational field, which will lift a degeneracy in mass models and permit a unique determination of the dark matter density in the baryon-dominated region of this galaxy. We accomplish this by measuring the temperature and emission measure distribution at a few radial locations along the disk. Existing data prove feasibility but are not sufficiently deep.

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