Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...416l..45b&link_type=abstract
Astrophysical Journal Letters v.416, p.L45
Astronomy and Astrophysics
Astronomy
65
Cosmology: Dark Matter, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Formation, Galaxies: Fundamental Parameters, Galaxies: Kinematics And Dynamics, Galaxies: Structure
Scientific paper
Values of the M/L_B_ ratio in the inner regions of elliptical (E) galaxies are determined using ionized gas disks as tracers of the triaxial potential. These data, when combined with those provided by the H I disks extending to the outer regions, show that the variation of M/L_B_ with galactocentric radius in Es is similar to that of spirals. In particular, it is found that in spirals and Es of the same visible mass the radius where the density of the dark matter equals that of the visible matter occurs at the same distance in units of r_e_, namely at 1.2r_e_. This suggests a similar picture of baryonic collapse into a preexisting DM halo for both Es and spirals.
Bertola Francesco
Persic Massimo
Pizzella Alessandro
Salucci Paolo
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