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Paper: FAST Mapping of Diffuse HI Gas in the Local Universe
Volume: 502, Frontiers in Radio Astronomy and FAST Early Sciences Symposium 2015
Page: 49
Authors: Zhu, M.; Pisano, D.J.; Ai, M.; Jiao, Q.
Abstract: We propose to use the Five hundred meter Aperture Spherical radio Telescope (FAST) to map the diffuse intergalactic HI gas in the local universe at column densities of NHI=1018 cm–2 and below. The major science goal is to study gas accretion during galaxy evolution, and trace cosmic web features in the local universe. We disuss the technical feasibilty of such a deep survey, and have conducted test observations with the Arecibo 305 m telescope. Our preliminary results shows that, with about a few thousand hours of observing time, FAST will be able to map several hundred square degree regions at 1 σ of NHI=2×1017 cm–2 level out to a distance of 5-10 Mpc, and with a volume 1000 larger than that of the Local Group.
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