NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-23 T18:05:38 PDT
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For refcode 2007MNRAS.377..507Y:
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Copyright by Royal Astronomical Society. 2007MNRAS.377..507Y The radial Tully-Fisher relation for spiral galaxies - I Irina A. Yegorova and Paolo Salucci Abstract. We find a new Tully-Fisher-like relation for spiral galaxies holding at different galactocentric radii. This radial Tully-Fisher relation allows us to investigate the distribution of matter in the optical regions of spiral galaxies. This relation, applied to three different samples of rotation curves of spiral galaxies, directly proves that: (i) the rotation velocity of spirals is a good measure of their gravitational potential and both the rotation curve's amplitudes and profiles are well predicted by galaxy luminosity, (II) the existence of a dark component, less concentrated than the luminous one, and (III) a scaling law, according to which, inside the disc optical size: M_dark_/M_lum_ = 0.5(L_B_/10^11^ L_B_sun_)^-0.7^. Key words: galaxies: kinematics and dynamics, galaxies: spiral, dark matter
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