The Dearth of Neutral Hydrogen in Galactic Dwarf Spheroidal Galaxies

  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={arXiv: Astrophysics of Galaxies},
We present new upper limits on the neutral hydrogen (HI) 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 (ALFALFA) survey and Galactic All-Sky Survey (GASS) data. All of the limits Mlim are more stringent than previously reported values, and those from the GBT improve upon contraints in the literature by a median factor of 23. Normalizing by… 

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