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IZw18, or The Picture of Dorian Gray: The More You Watch it, The Older it Gets

Published online by Cambridge University Press:  01 August 2006

M. Tosi ,
A. Aloisi ,
J. Mack  and
M. Maio
M. Tosi
Affiliation:
INAF – Osservatorio Astronomico di Bologna, Bologna, Italy email:monica.tosi@oabo.inaf.it
A. Aloisi
Affiliation:
ESA and Space Telescope Science Institute, Baltimore, USA
J. Mack
Affiliation:
Space Telescope Science Institute, Baltimore, USA
M. Maio
Affiliation:
INAF – Osservatorio Astronomico di Bologna, Bologna, Italy email:monica.tosi@oabo.inaf.it
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Abstract

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IZw18 has been recurrently claimed to be a young galaxy, but stars of increasingly older ages are found every time deeper magnitude levels are reached with high-resolution photometry: from the original few Myrs to, possibly, several Gyrs. We summarize the history of IZw18's age and an HST project which will allow us to derive both its distance and age.

Keywords

galaxies: evolutiongalaxies: stellar contentgalaxies: individual (IZw18)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 65 - 66
Copyright
Copyright © International Astronomical Union 2007

References

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