Dusty Waves on a Starry Sea: The Mid-Infrared View of M31

  title={Dusty Waves on a Starry Sea: The Mid-Infrared View of M31},
  author={Pauline Barmby and Michael L. N. Ashby and Luciana Bianchi and Charles William Engelbracht and Robert D. Gehrz and Karl D. Gordon and Joannah L. Hinz and John Peter Huchra and Roberta M. Humphreys and Michael Andrew Pahre and Pablo G. P{\'e}rez-Gonz{\'a}lez and Elisha F. Polomski and George H. Rieke and David A. Thilker and Steven P. Willner and Charles E. Woodward},
  journal={The Astrophysical Journal Letters},
  pages={L45 - L49}
Mid-infrared observations of the Andromeda galaxy, M31, obtained with the Infrared Array Camera on board the Spitzer Space Telescope are presented. The image mosaics cover areas of approximately 3.°7 × 1.°6 and include the satellite galaxies M32 and NGC 205. The appearance of M31 varies dramatically in the different mid-infrared bands, from the smooth bulge and disk of the old stellar population seen at 3.6 μm to the well-known "10 kpc ring" dominating the 8 μm image. The similarity of the 3.6… 

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