Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19111502d&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #115.02; Bulletin of the American Astronomical Society, Vol. 29, p.1398
Astronomy and Astrophysics
Astronomy
Scientific paper
IZw18 is the most metal-poor star-forming galaxy known and for many decades it was thought to be the best example of a starburst from a primordial HI cloud. However, in the past few years HST images and high signal-to-noise ground based spectra have revealed a complete different scenario for IZw18. It has even been suggested that the present burst of star formation in IZw18 may not be the first one in its lifetime. Moreover, the presence of Wolf-Rayet stars in such a low metallicity environment will be an important constraint on theories of massive star evolution. We have used archival HST images to study the stellar and gaseous spatial distribution in IZw18. We have created HeII, [OIII], Hα and continuum maps and analysed the excitation conditions of the gas. The HeII map and the most recent ground based spectroscopy from the literature were used in order to distinguish between HeII nebular emission and stellar emission.
de Mello Duilia
Heldmann Jennifer
Leitherer Cl.
Schaerer Daniel
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