Extra-planar {H I} in Low Surface Brightness Galaxies

Details Extra-planar {H I} in Low Surface Brightness Galaxies Extra-planar {H I} in Low Surface Brightness Galaxies

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..331..253m&link_type=abstract

Extra-Planar Gas, ASP Conference Proceedings, Vol. 331. Edited by Robert Braun. Proceedings of the meeting held at Dwingeloo,

Astronomy and Astrophysics

Astronomy

Scientific paper

Sensitive {H I} imaging observations of two isolated, edge-on, low surface brightness (LSB) spiral galaxies have revealed a vertically-extended neutral hydrogen component in both systems, extending to |z|˜2.3-2.9 kpc. These represent the first reported detections of extra-planar {H I} emission in galaxies with such low current star formation rate (˜0.01-0.02 M&sun; yr-1). Three-dimensional modeling of one of these galaxies (UGC 7321) shows that neither warping nor flaring of the gas layer alone can account for the observations, implying the existence of an additional {H I} ``halo'' component. This ``halo'' appears to lag in rotation relative to the material in the midplane. In the second galaxy, IC 2233, the high-latitude {H I} is more extensive and shows more complex kinematics, including possible evidence for a component that is orbiting inclined ˜45° to the disk. I briefly discuss possible origins for the high-latitude gas in these two LSB galaxies.

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