Abstract
A flux-limited sample of IRAS variable sources is used to probe the three-dimensional structure of the Galactic bulge. No distinct vertically extended bulge component is seen; the spatial distribution is that of a centrally concentrated disk. The two-dimensional distribution of IRAS variables on the sky is well fitted by an exponential disk with scale length a = 4.5 kpc and scale height h = 800 pc and more poorly fitted by an exponential disk plus an R 1/4 law. The combined results suggest that any bulge component is quite small and/or flattened with a vertical scale height not significantly larger than the disk itself
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