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2005MNRAS.358..503K - Mon. Not. R. Astron. Soc., 358, 503-520 (2005/April-1)
Structure and kinematics of edge-on galaxy discs - V. The dynamics of stellar discs.
KREGEL M., VAN DER KRUIT P.C. and FREEMAN K.C.
Abstract (from CDS):
Although the individual uncertainties are large, we find from the dynamical modelling that at least 12 discs are submaximal. The average disc contributes 53±4 per cent to the observed rotation at 2.2 disc scalelengths (hR), with a 1σ scatter of 15 per cent. This percentage becomes somewhat lower when effects of finite disc flattening and gravity by the dark halo and the gas are taken into account. Since boxy and peanut-shaped bulges are probably associated with bars, the result suggests that at 2.2hR the submaximal nature of discs is independent of barredness. The possibility remains that very high surface brightness discs are maximal, as these discs are underrepresented in our sample. We confirm that the radial stellar disc velocity dispersion is related to the galaxy maximum rotational velocity. The scatter in this σ versus vmaxrelation appears to correlate with the disc flattening, face-on central surface brightness and dynamical mass-to-light ratio. Low surface brightness discs tend to be more flattened and have smaller stellar velocity dispersions. The findings are consistent with the observed correlation between disc flattening and dynamical mass-to-light ratio and can generally be reproduced by the simple collapse theory for disc galaxy formation. Finally, the disc mass Tully-Fisher relation is offset from the maximum-disc scaled stellar mass Tully-Fisher relation of the Ursa Major cluster. This offset, -0.3 dex in mass, is naturally explained if the discs of the Ursa Major cluster spirals are submaximal.
Abstract Copyright: 2005 RAS
Journal keyword(s): galaxies: fundamental parameters - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure
Simbad objects: 66
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