Isolating Clusters with Wolf-Rayet Stars in I Zw 18

Details Isolating Clusters with Wolf-Rayet Stars in I Zw 18 Isolating Clusters with Wolf-Rayet Stars in I Zw 18

2002-10-03

arxiv.org/abs/astro-ph/0210089v2

Astrophys.J. 579 (2002) L75-L78; Erratum-ibid. 581 (2002) L129

Astronomy and Astrophysics

Astrophysics

4 pages, Latex. 2 figures (1 color). Uses corrected version of emulateapj.sty and apjfonts.sty (included). Accepted for public

Scientific paper

10.1086/345336

We present UV images and spectra of the starburst galaxy I Zw 18, taken with the Space Telescope Imaging Spectrograph. The high spatial resolution of these data allows us to isolate clusters containing Wolf-Rayet stars of the subtype WC. Our far-UV spectra clearly show CIV 1548,1551 and HeII 1640 emission of WC stars in two clusters: one within the bright (NW) half of I Zw 18, and one on the outskirts of this region. The latter spectrum is unusual, because the CIV is seen only in emission, indicating a spectrum dominated by WC stars. These data also demonstrate that the HI column in I Zw 18 is strongly peaked in the fainter (SE) half of I Zw 18, with a column depth far larger than that reported in previous analyses.

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