Systematics of Dark Halos in High Surface Brightness Spiral Galaxies

Details Systematics of Dark Halos in High Surface Brightness Spiral Galaxies Systematics of Dark Halos in High Surface Brightness Spiral Galaxies

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1125g&link_type=abstract

The Astronomical Journal, Volume 116, Issue 3, pp. 1125-1141.

Astronomy and Astrophysics

Astronomy

15

Cosmology: Dark Matter, Galaxies: Kinematics And Dynamics

Scientific paper

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)=gammaM^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 of Sb galaxies is 2.7 M_&sun; L^-1_solar for an average color <(B - V)_0> = 0.71, that of the Sc's is = 1.5 M_solar L^-1_solar 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 gamma. 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.

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