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The Pattern Speeds of NGC 6946
Stockholm University, Faculty of Science, Department of Astronomy.
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2008 (English)In: Astronomical Society of the Pacific conference series: Pathways Through an Eclectic Universe, 2008, 2- p.Conference paper (Other (popular science, discussion, etc.))
Abstract [en]

We study the kinematics of the barred spiral galaxy NGC 6946 by investigating the velocity field from Hα Fabry-Perot observations, determine the pattern speed of the bar by using the Tremaine-Weinberg method, and find a main pattern speed of 21.7+4.0-0.8 km-1 s-1 kpc-1. Our data clearly suggest the presence of an additional pattern with a pattern speed more than twice that of the large pattern in this galaxy. We use the epicycle approximation to deduce the location of the resonance radii and subsequently determine the pattern speed between the radii, and find that inside the inner inner Lindblad resonance radius a bar-like system has evolved.

Place, publisher, year, edition, pages
2008. 2- p.
Keyword [en]
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Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-15334OAI: diva2:181854
Available from: 2009-01-25 Created: 2009-01-25Bibliographically approved

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Fathi, Kambiz
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Department of Astronomy
Astronomy, Astrophysics and Cosmology

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