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SUMMARY:Feathering Instability in Spiral Arms - Wing-Kit Lee (Academia Sin
 ica Institute of Astronomy and Astrophysics)
DTSTART:20150302T160000Z
DTEND:20150302T170000Z
UID:TALK56191@talks.cam.ac.uk
CONTACT:Jean Teyssandier
DESCRIPTION:\nSubstructures of spiral arms are commonly found in many near
 by disk galaxies. In particular\, the spatial correlation among gaseous fe
 athers\, stellar spurs\, and star-forming regions near the spiral arms are
  not well understood. In this talk\, I will present some theoretical ideas
  to explain their formation by considering the instability of the spiral s
 hock of the magnetized and self-gravitating interstellar medium. The norma
 l mode analysis by Lee & Shu showed that unstable growing modes may lead t
 o periodic density enhancements in the post-shock region\, which reassembl
 e the observed feathers. Some results from numerical simulations regarding
  the nonlinear evolution of this feathering instability will also be prese
 nted
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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