| 16th of July 2015 |
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| On the neutral gas content of nine new Milky Way satellite galaxy candidates |
| by Tobias Westmeier (ICRAR/UWA) |
| Westmeier et al. (2015) use a new, improved version of the HI Parkes All-Sky
Survey (HIPASS) to search for HI emission from nine new, ultra-faint Milky Way
satellite galaxy candidates recently discovered in data from the Dark Energy
Survey (DES). None of the candidates is detected in HI, implying upper limits
for their HI masses of typically several hundred to a few thousand solar
masses. The resulting upper limits on MHI/LV and
MHI/M* suggest that at least some of the new galaxy
candidates are HI deficient. This finding is consistent with the general HI
deficiency of satellite galaxies located within the Milky Way's virial radius
and supports the hypothesis that gas is being removed from satellites by tidal
and ram-pressure forces during perigalactic passages. In addition, some of the
objects may be embedded in, and interacting with, the extended neutral and
ionised gas filaments of the Magellanic Stream. Reference: Westmeier, Staveley-Smith, Calabretta, Jurek, Koribalski, Meyer, Popping, and Wong 2015, MNRAS, accepted (astro-ph/1507.03661) |