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Isolating Clusters with Wolf-Rayet Stars in I Z[CLC]w[/CLC] 18
- Source :
- The Astrophysical Journal. 579:L75-L78
- Publication Year :
- 2002
- Publisher :
- American Astronomical Society, 2002.
-
Abstract
- 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 C IV λλ1548, 1551 and He II λ1640 emission of WC stars in two clusters: one within the bright (northwest) half of I Zw 18 and one on the outskirts of this region. The latter spectrum is unusual because the C IV is seen only in emission, indicating a spectrum dominated by WC stars. These data also demonstrate that the H I column in I Zw 18 is strongly peaked in the fainter (southeast) half of I Zw 18, with a column depth far larger than that reported in previous analyses.
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 579
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi...........e66bc581ce159daf467c2b1a8eb15593