Isolating clusters with Wolf-Rayet stars in I Zw 18

Thomas M. Brown, Sara R. Heap, Ivan - Hubeny, Thierry Lanz, Don Lindler

Research output: Contribution to journalArticle

28 Citations (Scopus)

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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume579
Issue number2 II
DOIs
StatePublished - Nov 10 2002
Externally publishedYes

Fingerprint

Wolf-Rayet stars
stars
starburst galaxies
spectrographs
spatial resolution
telescopes
high resolution

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Isolating clusters with Wolf-Rayet stars in I Zw 18. / Brown, Thomas M.; Heap, Sara R.; Hubeny, Ivan -; Lanz, Thierry; Lindler, Don.

In: Astrophysical Journal, Vol. 579, No. 2 II, 10.11.2002.

Research output: Contribution to journalArticle

Brown, Thomas M. ; Heap, Sara R. ; Hubeny, Ivan - ; Lanz, Thierry ; Lindler, Don. / Isolating clusters with Wolf-Rayet stars in I Zw 18. In: Astrophysical Journal. 2002 ; Vol. 579, No. 2 II.
@article{591b291cba584b889679a78ac258b87f,
title = "Isolating clusters with Wolf-Rayet stars in I Zw 18",
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.",
keywords = "Galaxies: starburst, Galaxies: stellar content, Stars: Wolf-Rayet, Ultraviolet: galaxies",
author = "Brown, {Thomas M.} and Heap, {Sara R.} and Hubeny, {Ivan -} and Thierry Lanz and Don Lindler",
year = "2002",
month = "11",
day = "10",
doi = "10.1086/345336",
language = "English (US)",
volume = "579",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 II",

}

TY - JOUR

T1 - Isolating clusters with Wolf-Rayet stars in I Zw 18

AU - Brown, Thomas M.

AU - Heap, Sara R.

AU - Hubeny, Ivan -

AU - Lanz, Thierry

AU - Lindler, Don

PY - 2002/11/10

Y1 - 2002/11/10

N2 - 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.

AB - 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.

KW - Galaxies: starburst

KW - Galaxies: stellar content

KW - Stars: Wolf-Rayet

KW - Ultraviolet: galaxies

UR - http://www.scopus.com/inward/record.url?scp=0041526241&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0041526241&partnerID=8YFLogxK

U2 - 10.1086/345336

DO - 10.1086/345336

M3 - Article

VL - 579

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 II

ER -