Large-scale HI structure of the Circinus galaxy

Jones, K. L., Koribalski, B. S., Elmouttie, M. and Haynes, R. F. (1999) Large-scale HI structure of the Circinus galaxy. Monthly Notices of the Royal Astronomical Society, 302 4: 649-662. doi:10.1046/j.1365-8711.1999.02057.x


Author Jones, K. L.
Koribalski, B. S.
Elmouttie, M.
Haynes, R. F.
Title Large-scale HI structure of the Circinus galaxy
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 1999-02
Sub-type Article (original research)
DOI 10.1046/j.1365-8711.1999.02057.x
Open Access Status DOI
Volume 302
Issue 4
Start page 649
End page 662
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 1999
Language eng
Formatted abstract
HI observations with the Australia Telescope Compact Array (ATCA) are used to study the neutral gas distribution and kinematics of the Circinus galaxy. One of the most outstanding features of Circinus is its enormous size (at least 80 arcmin or nearly 100 kpc, assuming a distance of 4 Mpc) revealing a beautiful large-scale spiral pattern. The fit of a tilted-ring model to the velocity field reveals a strong kinematic warp of the outer spiral arms. The inner region (radius 250 arcsec or 5 kpc) contains a highly elongated structure with non-circular motions, suggesting that Circinus is a barred spiral galaxy. At the centre of Circinus there is a 50-arcsec or 1-kpc-radius HI ring or disc rotating with a speed of at least 200 km s-1.
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Tue, 10 Jun 2008, 14:27:41 EST