The pattern speeds of NGC 6946

Details The pattern speeds of NGC 6946 The pattern speeds of NGC 6946

2007-08-03

arxiv.org/abs/0708.0504v3

Astronomy and Astrophysics

Astrophysics

To appear in the conference proceedings for "Pathways Through an Eclectic Universe", Editors: Johan H. Knapen, Terry J. Mahone

Scientific paper

We study the kinematics of the barred spiral galaxy NGC 6946 by investigating the velocity field from H-alpha Fabry-Perot observations, determined 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/s/kpc. 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.

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