Isolating clusters with Wolf-Rayet stars in I Zw 18 (vol 579, pg L75, 2002)

被引：32

作者：

Brown, TM

Heap, SR

Hubeny, I

Lanz, T

Lindler, D

机构：

[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 581卷 / 02期

基金：

美国国家航空航天局;

关键词：

Galaxies: starburst; Galaxies: stellar content; Stars: Wolf-Rayet; Ultraviolet: galaxies;

D O I：

10.1086/345336

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：L129 / L129

页数：1