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={Robert Joseph Braun and David A. Thilker and Ren{\'e} A. M. Walterbos and Edvige 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… 
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