A Wide-Field High-Resolution H I Mosaic of Messier 31. I. Opaque Atomic Gas and Star Formation Rate Density

@article{Braun2009AWH,
  title={A Wide-Field High-Resolution H I Mosaic of Messier 31. I. Opaque Atomic Gas and Star Formation Rate Density},
  author={R. Braun and D. Thilker and R. Walterbos and E. Corbelli},
  journal={The Astrophysical Journal},
  year={2009},
  volume={695},
  pages={937-953}
}
We have undertaken a deep, wide-field H I imaging survey of M31, reaching a maximum resolution of about 50 pc and 2 km s–1 across a 95 × 48 kpc region. The H I mass and brightness sensitivity at 100 pc resolution for a 25 km s–1 wide spectral feature is 1500 M ☉ and 0.28 K. Our study reveals ubiquitous H I self-opacity features, discernible in the first instance as filamentary local minima in images of the peak H I brightness temperature. Local minima are organized into complexes of more than… Expand
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