Abstract
The study of gas outside the plane of disc galaxies is crucial to understanding the circulation of material within a galaxy and between galaxies and the intergalactic environment. We present new HI observations of the edge-on galaxy NGC 891, which show an extended halo component lagging behind the disc in rotation. We compare these results for NGC 891 with other detections of gaseous haloes. Finally, we present a dynamical model for the formation of extra-planar gas.
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Fraternali, F., Oosterloo, T., Binney, J. J., & Sancisi, R. (2007). The gaseous haloes of disc galaxies. In Astrophysics and Space Science Proceedings (Vol. 0, pp. 271–276). Springer Science and Business Media B.V. https://doi.org/10.1007/978-1-4020-5573-7_44
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