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Evidence for warping in outer disc of Milky Way galaxy.

The precise shape of our galaxy is difficult to determine because we are inside it and a lot is hidden from us by dust. Using the Japanese/South African Infrared Survey Facility at Sutherland, M.W Feast, J.W. Menzies, N. Matsunaga and P.A. Whitelock have found a number of Cepheid variables in a direction about opposite to the Galactic Centre (Nature on-line 14 May 2014). Since the luminosities of these stars are well known, the newly discovered ones could be shown to lie at a distance appropriate to an outer spiral arm. However, they lie somewhat above the Galactic Plane, leading to the conclusion that the arm must be a warped one.

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Title Annotation:News Notes
Publication:Monthly Notes of the Astronomical Society of Southern Africa
Article Type:Brief article
Geographic Code:6SOUT
Date:Jun 1, 2014
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