NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-23 T11:32:42 PDT
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For refcode 1993ApJ...416L..45B:
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1993ApJ...416L..45B DARK MATTER HALOS IN ELLIPTICAL GALAXIES FRANCESCO BERTOLA, ALESSANDRO PIZZELLA, MASSIMO PERSIC, AND PAOLO SALUCCI Received 1993 June 1; accepted 1993 August 6 ABSTRACT 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. Subject headings: dark matter galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: fundamental parameters - galaxies: kinematics and dynamics - galaxies: structure
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