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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...

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Publisher copy:
10.1086/306728

Authors


Sellwood, JA More by this author
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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Astrophysics
Journal:
Astrophys.J.
Volume:
511
Pages:
660-665
Publication date:
1998-06-23
DOI:
URN:
uuid:ad332a5f-c8d5-4d82-9728-ed1a7c675507
Source identifiers:
500529
Local pid:
pubs:500529
Keywords:

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