Halo Gas of M33

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The evolution of M33 depends on its interaction with its environment. This interaction can be traced through observations of the gaseous halo of M33 to detect possible satellite streams, condensing halo clouds, and/or extensions from M33's disk. We present neutral hydrogen observations from the Galactic Arecibo L-Band Feed Array (GALFA) HI Survey (in particular observations from TOGS http://www.astro.lsa.umich.edu/ mputman/togs.html) that probe the gaseous halo of M33 and its surrounding environment at unprecedented sensitivity (3σ NHI < 1018 cm-2 to a 25 km s-1 feature) and resolution (3.5’ and 0.2 km s-1). The GALFA data reveal both anomalous velocity halo clouds and a large arc of HI extending from the northern warp of M33 back to the galaxy's disk. The velocity resolution of GALFA enables clouds related to M33 to be disentangled from Galactic features and their dynamics to be examined.
Similar to the Galaxy and M31, the amount of mass in HI in M33's halo is in the range of a few x 107 Mo. We discuss the origin of M33's halo features in the context of its proximity to M31, galaxy formation models, and the nature of its star forming disk.

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