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2005ApJ...632..859M - Astrophys. J., 632, 859-871 (2005/October-3)

The baryonic Tully-Fisher relation of galaxies with extended rotation curves and the stellar mass of rotating galaxies.


Abstract (from CDS):

I investigate the baryonic Tully-Fisher relation for a sample of galaxies with extended 21 cm rotation curves spanning the range 20 km/s≲Vf≤300 km/s. A variety of scalings of the stellar mass-to-light ratio Υ* are considered. For each prescription for Υ*, I give fits of the form Md=AVxf. Presumably, the prescription that comes closest to the correct value will minimize the scatter in the relation. The fit with minimum scatter has A=50 Mkm–4 s4 and x=4. This relation holds over five decades in mass. Galaxy color, stellar fraction, and Υ*are correlated with each other and with Md, in the sense that more massive galaxies tend to be more evolved. There is a systematic dependence of the degree of maximality of disks on surface brightness. High surface brightness galaxies typically have Υ*~(3)/(4) of the maximum disk value, while low surface brightness galaxies typically attain ~(1)/(4) of this amount.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Kinematics and Dynamics - Galaxies: Spiral

Simbad objects: 69

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