Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724619h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #246.19; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present the HALOGAS (Hydrogen Accretion in LOcal GAlaxieS) survey. This is the first systematic investigation of cold gas accretion in nearby spiral galaxies to date. It consists of deep (120 hours) WSRT observations of 22 edge-on and moderately-inclined nearby galaxies. Using these data we are able to detect neutral hydrogen down to a column density of about 1019 cm-2, and characterise the faint extra-planar and anomalous-velocity neutral gas with excellent spatial and velocity resolution. HALOGAS data also allow us to study the disc structure and dynamics in unprecedented detail for a sample of this size.
Observations carried out so far show a variety of HI properties, ranging from accretion of (and interaction with) satellite galaxies to filaments possibly caused by star formation in the disc. The detected amount of anomalous gas indicative of accretion episodes varies significantly from galaxy to galaxy. This suggests that accretion of neutral gas from the ambient medium is a rather episodic process.
A number of companion posters present first results on the modelling of some of the observed galaxies and on observations at other wavelengths which complement our 21 cm data.
HALOGAS Team
Heald George H.
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