The Radial Tully-Fisher relation for spiral galaxies I

We find a new Tully-Fisher-like relation for spiral galaxies holding at different galactocentric radii. This Radial Tully-Fisher (RTF) 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...

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Bibliographic Details
Published in:arXiv.org 2006-12
Main Authors: Yegorova, Irina A, Salucci, Paolo
Format: Article
Language:English
Subjects:
Galactic rotation
Galaxy distribution
Luminosity
Scaling laws
Spiral galaxies
Spirals
Tully-Fisher relation
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Summary:We find a new Tully-Fisher-like relation for spiral galaxies holding at different galactocentric radii. This Radial Tully-Fisher (RTF) 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: 1) the rotation velocity of spirals is a good measure of their gravitational potential and both the RC's amplitudes and profiles are well predicted by galaxy luminosity 2) the existence of a dark component, less concentrated than the luminous one, and 3) a scaling law, according to which, inside the disk optical size: \( M_{dark}/M_{lum} = 0.5 (L_B/10^{11}L_{B\odot})^{-0.7}\).
ISSN:2331-8422
DOI:10.48550/arxiv.0612434