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- W1620043013 abstract "The thickness of the neutral hydrogen layer, coupled with the rotation curve, traces the outer dark matter potential. We estimate the amplitude of the flaring in spiral galaxies from a 3D model of the HI gas. Warps in particular are explicitly parametrized in the form of an harmonical density wave. Ap- plying our method to the galaxy NGC 891, the only model that couldttheobservations,andinparticulartheHIatlargeheight above the plane, includes a strong warp with a line of node al- most coinciding with the line of sight. This high-Z HI is not observed at the most extreme velocity channels, those corre- sponding to high rotational velocities. This is accounted for by the model, since orbits in the tilted planes are not circular, but elongated, with their minor axis in the galaxy plane. Their ve- locity on the major axis (i.e. at their maximal height above the plane) is then 30% less than in the plane. We nally connect the modelled vertical outer gaseous distribution to the dark mat- ter through hydrodynamical and gravitational equations. Under the assumption of isotropy of the gaseous velocity dispersion, we conclude on a very flattened halo geometry for the galaxy NGC891(q 0:2),whileaverticalvelocitydispersionsmaller that the radial one would lead to a less flattened Dark Matter Halo (q 0:4 0:5). Both results however suggests that dark matter is dissipative or has been strongly influenced by the gas dynamics." @default.
- W1620043013 created "2016-06-24" @default.
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- W1620043013 date "1997-04-10" @default.
- W1620043013 modified "2023-09-27" @default.
- W1620043013 title "The 3D Geometry of Dark Matter Halos" @default.
- W1620043013 hasPublicationYear "1997" @default.
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