The HI content of isolated ultra-diffuse galaxies: A sign of multiple formation mechanisms?

@article{Papastergis2017TheHC,
  title={The HI content of isolated ultra-diffuse galaxies: A sign of multiple formation mechanisms?},
  author={Emmanouil Papastergis and Elizabeth A. K. Adams and Australia Kapteyn Institute and Netherlands and Astron. and San Diego State University and Usa},
  journal={Astronomy and Astrophysics},
  year={2017},
  volume={601}
}
We report on the results of radio observations in the 21 cm emission line of atomic hydrogen (HI) of four relatively isolated ultra-diffuse galaxies (UDGs): DGSAT I, R-127-1, M-161-1, and SECCO-dI-2. Our Effelsberg observations resulted in non-detections for the first three UDGs, and a clear detection for the last. DGSAT I, R-127-1, and M-161-1 are quiescent galaxies with gas fractions that are much lower than those of typical field galaxies of the same stellar mass. On the other hand, SECCO-dI… 

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