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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, vol. 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
Authors/Creators:Cole, AA and Weinberg, MD
Keywords: Galaxy: disk—Galaxy: structure—stars: carbon
Journal or Publication Title: The Astrophysical Journal Letters
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