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For refcode 1998AJ....116.1125G:
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1998AJ....116.1125G SYSTEMATICS OF DARK HALOS IN HIGH SURFACE BRIGHTNESS SPIRAL GALAXIES EDMOND GIRAUD Observatoire de Marseille, Place Le Verrier, 13248 Marseille, France; giraud@observatoire.cnrs-mrs.fr Received 1998 February 17; revised 1998 June 3 ABSTRACT A study of mass distributions in 22 spiral galaxies, with rotation curves taken from the literature and Hubble types ranging from Sa to Sd, is presented. It is demonstrated that a relation of the form M_d_(r) = {gamma}M^1/2^(r)r between the mass distribution of the luminous components M(r) and that of the dark halo M_d_(r) is consistent with the observed kinematics with only the dark-to-visible mass ratio displaying significant variations between galaxies. The parameter {gamma}, which is correlated with M_dyn_/M_lum_, characterizes the relative importance of the dark-to- luminous mass. The model M/L ratio of the stellar component, M/L_B_(stars), is correlated with the observed B - V color. In our sample the average model <M/L_B_(stars)> of Sb galaxies is 2.7 M_sun_ L_sun_^-1^ for an average color <(B - V)_0_> = 0.71, that of the Sc's is <M/L_B_(stars)> = 1.5 M_sun_ L_sun_^-1^ for <(B - V)_0_> = 0.54, both values being in very good agreement with population synthesis models. A large part of the intrinsic scatter in the Tully-Fisher relation is due to the spread in [γ]. The relation of coupling accounts for the disk-halo conspiracy in HSB spirals and is also valid in LSB dwarf galaxies. Its universality in disk rotating systems implies the existence of a physical mechanism responsible for the continuity between visible and dark mass distributions. Key words: dark matter-galaxies: kinematics and dynamics
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