The Warped HI Layer of the Outer Galaxy

Using the Leiden/Dwingeloo Survey (Hartmann & Burton 1997) of the Galactic sky north of declination -30 degrees as the principal component of a composite data cube, the structure of the warped HI layer of the outer Galaxy was displayed by converting the data cube from heliocentric (l,b,v) coordi...

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Bibliographic Details
Published in:arXiv.org 2006-01
Main Authors: Voskes, Tom, W Butler Burton
Format: Article
Language:English
Subjects:
Computer simulation
Declination
Galaxies
Kinematics
Morphology
Online analytical processing
Sky surveys (astronomy)
Software reviews
Software upgrading
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Summary:Using the Leiden/Dwingeloo Survey (Hartmann & Burton 1997) of the Galactic sky north of declination -30 degrees as the principal component of a composite data cube, the structure of the warped HI layer of the outer Galaxy was displayed by converting the data cube from heliocentric (l,b,v) coordinates to galactocentric (R,theta,z) coordinates. We masked out known high-velocity-cloud complexes that might otherwise have contaminated the resulting description of the warped layer. We considered analogous displays under controlled circumstances by using as input medium a simulation of the same complete (l,b,v) data cube corresponding to a modeled HI Galaxy of known morphology and kinematics. By varying this artificial input we were able to check our method of converting the data cube and to put constraints on the global parameters that have been used to explain different asymmetries in the heliocentric data.
ISSN:2331-8422