Spitzer MIPS Infrared Imaging of M31: Further Evidence for a Spiral-Ring Composite Structure

  title={Spitzer MIPS Infrared Imaging of M31: Further Evidence for a Spiral-Ring Composite Structure},
  author={Karl D. Gordon and Jeremy Bailin and Charles William Engelbracht and George H. Rieke and Karl Anthony Misselt and William B. Latter and Erick T. Young and Matthew L. N. Ashby and Pauline Barmby and Brad K. Gibson and Dean C. Hines and Joannah L. Hinz and Oliver Krause and Deborah A. Levine and Francine R. Marleau and Alberto Noriega‐Crespo and Susan Renee Stolovy and David A. Thilker and Michael W. Werner},
  journal={The Astrophysical Journal Letters},
  pages={L87 - L92}
New images of M31 at 24, 70, and 160 μm taken with the Multiband Imaging Photometer for Spitzer (MIPS) reveal the morphology of the dust in this galaxy. This morphology is well represented by a composite of two logarithmic spiral arms and a circular ring (radius ~10 kpc) of star formation offset from the nucleus. The two spiral arms appear to start at the ends of a bar in the nuclear region and extend beyond the star-forming ring. As has been found in previous work, the spiral arms are not… 

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