ANDROMEDA'S DUST

@article{Draine2013ANDROMEDASD,
  title={ANDROMEDA'S DUST},
  author={Bruce T. Draine and G. Aniano and Oliver Krause and Brent A. Groves and Karin M. Sandstrom and Robert Joseph Braun and Adam K. Leroy and Ulrich Klaas and Hendrik Linz and Hans–Walter Rix and Eva Schinnerer and Anika Schmiedeke and Fabian Walter},
  journal={The Astrophysical Journal},
  year={2013},
  volume={780}
}
Spitzer Space Telescope and Herschel Space Observatory imaging of M31 is used, with a physical dust model, to construct maps of dust surface density, dust-to-gas ratio, starlight heating intensity, and polycyclic aromatic hydrocarbon (PAH) abundance, out to R ≈ 25 kpc. The global dust mass is Md = 5.4 × 107 M☉, the global dust/H mass ratio is Md/MH = 0.0081, and the global PAH abundance is 〈qPAH〉 = 0.039. The dust surface density has an inner ring at R = 5.6 kpc, a maximum at R = 11.2 kpc, and… 
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