The Arecibo Galaxy Environment Survey – X. The structure of halo gas around M33

  title={The Arecibo Galaxy Environment Survey – X. The structure of halo gas around M33},
  author={Olivia Keenan and Jonathan Ivor Davies and Rhys Taylor and Robert. F. Minchin},
  journal={Monthly Notices of the Royal Astronomical Society},
As part of the H i Arecibo Galaxy Environment Survey (AGES), we have observed 5 × 4 deg of sky centred on M33, reaching a limiting column density of ∼1.5 × 1017 cm−2 (line width of 10 km s−1 and resolution 3.5 arcmin). We particularly investigate the absence of optically detected dwarf galaxies around M33, something that is contrary to galaxy formation models. We identify 22 discrete H i clouds, 11 of which are new detections. The number of objects detected and their internal velocity… 
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