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An Upper Limit to the Age of the Galactic Bar

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Cole, AA and Weinberg, MD (2002) An Upper Limit to the Age of the Galactic Bar. The Astrophysical Journal Letters, 574. pp. 43-46.

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Abstract

Using data from the Two Micron All Sky Survey, we identify a population of infrared carbon stars with J-Ks ≥ 2 in the Milky Way. These stars are shown to trace the stellar bar previously identified in IR and optical S surveys. The properties of C stars strongly suggest that they are of intermediate age. We conclude that the bar is likely to have formed more recently than 3 Gyr ago and must be younger than 6 Gyr. Implications and further tests of this conclusion are briefly discussed

Item Type: Article
Keywords: Galaxy: disk—Galaxy: structure—stars: carbon
Journal or Publication Title: The Astrophysical Journal Letters
Page Range: pp. 43-46
Date Deposited: 22 Nov 2007 02:40
Last Modified: 18 Nov 2014 03:25
URI: http://eprints.utas.edu.au/id/eprint/2516
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