NDLI: A New Age and Distance for I Zw 18, the Most Metal-Poor Galaxy in the Nearby Universe

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A New Age and Distance for I Zw 18, the Most Metal-Poor Galaxy in the Nearby Universe

Content Provider	Scilit
Author	Aloisi, A. Clementini, G. Tosi, M. Annibali, F. Contreras, R. Fiorentino, G. Mack, J. Marconi, M. Musella, I. Saha, A. Sirianni, M. van der Marel, R. P.
Copyright Year	2008
Description	The blue compact dwarf galaxy I Zw 18 holds the record of the lowest metallicity ever observed in the local universe. As such, it represents the closest analog to primordial galaxies in the early universe. More interestingly, it has recurrently been regarded as a genuinely young galaxy caught in the process of forming in the nearby universe. However, stars of increasingly older ages are found within I Zw 18 every time deeper high-resolution photometric observations are performed with the Hubble Space Telescope (HST): from the original few tens of Myrs to, possibly, several Gyrs. Here we summarize the history of I Zw 18 age and present an ongoing HST/ACS project which allowed us to precisely derive the galaxy distance by studying its Cepheid variables, and to firmly establish the age of its faintest resolved populations.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/122689FFD772EC7AA0AD29964015F14A/S174392130802512Xa.pdf/div-class-title-a-new-age-and-distance-for-i-zw-18-the-most-metal-poor-galaxy-in-the-nearby-universe-div.pdf
Ending Page	391
Page Count	5
Starting Page	387
ISSN	17439213
e-ISSN	17439221
DOI	10.1017/s174392130802512x
Journal	Proceedings of the International Astronomical Union
Issue Number	S255
Volume Number	4
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	2008-06-01
Access Restriction	Open
Subject Keyword	Proceedings of the International Astronomical Union Astronomy and Astrophysics Dwarf Starburst Evolution Stellar Content Distances Redshifts Individual (i Zw 18) ) Cepheids
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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