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The Shape and Figure Rotation of the Dark Halo of NGC 2915

Bureau, Martin; Freeman, Kenneth; Pfitzner, David W; Meurer, Gerhardt


NGC 2915 is a blue compact dwarf galaxy with a very extended H I disk. This disk shows a short central bar and extended spiral arms, both reaching far beyond the optical component. We use Tremaine & Weinberg's method to measure the pattern speed of the bar and spiral arms from H I radio synthesis data. Our measurements yield a pattern speed Ωp = 0.21 ± 0.06 km s-1 arcsec-1 (8.0 ± 2.4 km s-1 kpc-1 for D = 5.3 kpc), in disagreement with the general view that corotation in barred disks lies just...[Show more]

CollectionsANU Research Publications
Date published: 1999
Type: Journal article
Source: Astronomical Journal


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