Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-21
Astrophys.J. 593 (2003) 721-732
Astronomy and Astrophysics
Astrophysics
to appear in the August 20 Astrophysical Journal; 17 pages; version with full resolution figures available at http://cfa-www
Scientific paper
10.1086/376602
From the analysis of sensitive HI 21-cm line observations, we find evidence for vertically extended HI emission (|z|<~2.4 kpc) in the edge-on, low surface brightness spiral galaxy UGC7321. Three-dimensional modelling suggests that the HI disk of UGC7321 is both warped and flared, but that neither effect can fully reproduce the spatial distribution and kinematics of the highest z-height gas. We are able to model the high-latitude emission as an additional HI component in the form of a ``thick disk'' or ``halo'' with a FWHM~3.3 kpc. We find tentative evidence that the vertically extended gas declines in rotational velocity as a function of z, although we are unable to completely rule out models with constant V(z). In spite of the low star formation rate of UGC7321, energy from supernovae may be sufficient to sustain this high-latitude gas. However, alternative origins for this material, such as slow, sustained infall, cannot yet be excluded.
Matthews Lynn Diane
Wood Kenneth
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