The WSRT HALOGAS Survey

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present the status of, and early results from, the WSRT 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 20 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 characterize the faint extra-planar and anomalous-velocity neutral gas with excellent spatial and velocity resolution. HALOGAS data also allow us to study the disk 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 disk. The detected amount of anomalous gas indicative of accretion episodes varies significantly from galaxy to galaxy. We illustrate the range of extraplanar HI features detected in the HALOGAS sample, and compare with complementary deep optical observations which have been obtained at the INT (the HALOSTARS project).
Companion posters present detailed modeling of some of the observed galaxies, and optical spectroscopic observations which complement our 21 cm data.

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