Journal article

### Differential Rotation and Turbulence in Extended HI Disks

Abstract:

When present, extended disks of neutral hydrogen around spiral galaxies show a remarkably uniform velocity dispersion of approx 6 km/s. Since stellar winds and supernovae are largely absent in such regions, neither the magnitude nor the constancy of this number can be accounted for in the classical picture in which interstellar turbulence is driven by stellar energy sources. Here we suggest that magnetic fields with strengths of a few microgauss in these extended disks allow energy to be extr...

Publisher copy:
10.1086/306728

### Authors

More by this author
Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Astrophysics
Role:
Author
Journal:
Astrophys.J.
Volume:
511
Pages:
660-665
Publication date:
1998-06-23
DOI:
Source identifiers:
500529
Keywords:
Pubs id:
pubs:500529
UUID:
Local pid:
pubs:500529
Deposit date:
2015-01-05