Is I ZW 18 Really a Young Galaxy?

Details Is I ZW 18 Really a Young Galaxy? Is I ZW 18 Really a Young Galaxy?

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..421a&link_type=abstract

Astrophysics and Space Science, v. 276, Issue 2/4, p. 421-428 (2001).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

To understand the role of dwarfs in the context of galaxy formation and evolution, we are studying the star-formation history of some representative irregular and blue compact dwarf galaxies by comparing the observed colour-magnitude diagrams with synthetic ones based on homogeneous sets of stellar evolutionary tracks. Here we present the results obtained for the blue compact I Zw 18, the most metal-poor galaxy known. Our simulations suggest star-formation activity started around 1-0.3 Gyr ago, with evidence of an intense burst around 15-20 Myr ago. I Zw 18 has turned out not to be a young object as previously suggested.

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