High-Redshift Star-Forming Galaxies: Angular Momentum and Baryon Fraction, Turbulent Pressure Effects and the Origin of Turbulence
Burkert, A. and Genzel, R. and Bouche, N. and Cresci, G. and Khochfar, S. and Sommer-Larsen, J. and Sternberg, A. and Naab, T. and Foerster-Schreiber,
Keywords
Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract
The structure of a sample of high-redshift (z=2), rotating galaxies with high star formation rates and turbulent gas velocities of sigma=40-80 km/s is investigated. Fitting the observed disk rotational velocities and radii with a Mo, Mao, White (1998) (MMW) model leads to unusually large spin parameters in the range of lambda=0.05-0.2. In addition, the ratios of disk-to-dark halo masses md are extreme and in several cases exceed the cosmic baryon fraction. The galaxies segregate into dispersion-dominated systems with 1
