THE DEARTH OF NEUTRAL HYDROGEN IN GALACTIC DWARF SPHEROIDAL GALAXIES

@article{Spekkens2014THEDO,
  title={THE DEARTH OF NEUTRAL HYDROGEN IN GALACTIC DWARF SPHEROIDAL GALAXIES},
  author={Kristine Spekkens and Natasha Urbancic and Brian S. Mason and Beth Willman and James E. Aguirre},
  journal={The Astrophysical Journal Letters},
  year={2014},
  volume={795}
}
We present new upper limits on the neutral hydrogen (H i) content within the stellar half-light ellipses of 15 Galactic dwarf spheroidal galaxies (dSphs), derived from pointed observations with the Green Bank Telescope (GBT) as well as Arecibo L-band Fast ALFA survey and Galactic All-Sky Survey data. All of the limits are more stringent than previously reported values, and those from the GBT improve upon constraints in the literature by a median factor of 23. Normalizing by V-band luminosity LV… 
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