Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934626w&link_type=abstract
American Astronomical Society, AAS Meeting #219, #346.26
Astronomy and Astrophysics
Astronomy
Scientific paper
Several galaxies show decreasing rotational velocities of neutral and ionized hydrogen gas with increasing height above the disk. This is likely due to a combination of outflow from galactic fountains and infall from the IGM or satellite accretion. The degree to which each component contributes affects the rotational velocity gradient of the gas and has implications for halo formation and evolution. We present results from optical observations and modeling of the ionized extra-planar gas in NGC 4244, NGC 891, and NGC 4565, three edge-on galaxies from the HALOGAS (Hydrogen Accretion in LOcal GAlaxieS) sample. HALOGAS is a WSRT deep HI survey studying cold gas accretion in the local universe. Our observations are from a multi-slit spectroscopic setup on the ARC 3.5m telescope, which allows us to measure velocities of Ha-emitting gas as a function of height above the disk in 11 radial distance bins in a single exposure. We compare our results to the HI velocity data and show that the neutral and ionized gas exhibit similar kinematic characteristics.
RW acknowledges support from NSF grant AST-0908126 and from a grant from Research Corporation for the Advancement of Science.
HALOGAS Team
Heald George
Rand Richard
Walterbos Rene
Wu Catharine J.
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