I Zw 18 as morphological paradigm for rapidly assembling high-zgalaxies
نویسندگان
چکیده
منابع مشابه
Isolating Clusters with Wolf-rayet Stars in I Zw 18
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 (NW) half of I Zw 18, and one on t...
متن کاملAstronomy and Astrophysics Is I Zw 18 a Young Galaxy?
Hubble Space Telescope (HST) colour magnitude diagrams in B, V and R along with long-slit Multiple Mirror Telescope (MMT) spectrophotometric data are used to investigate the evolutionary status of the nearby blue compact dwarf (BCD) galaxy I Zw 18. We find that the distance to I Zw 18 should be as high as 20 Mpc, twice the previously accepted distance, to be consistent with existing observation...
متن کاملFUSE observations of the H I interstellar gas of I Zw 18
We present the analysis of FUSE observations of the metal-deficient dwarf galaxy I Zw 18. We measured
متن کاملA New Deep HST/ACS CMD of I Zw 18: Evidence for Red Giant Branch Stars
We present results from new deep HST/ACS photometry of I Zw 18, the most metalpoor blue compact dwarf galaxy in the nearby universe. It has been previously argued that this is a very young system that started forming stars only . 500 Myr ago, but other work has hinted that older (& 1 Gyr) red giant branch (RGB) stars may exist in this galaxy. Our deeper data indeed reveal evidence for an RGB. U...
متن کاملThe Nature Of Radio Continuum Emission At Very Low Metallicity : VLA Observations of I Zw 18
We present the first resolved study of the radio continuum properties of I Zw18, the dwarf galaxy with the lowest known nebular metal abundance in the local universe. New Very Large Array radio continuum images at 20 and 3.6 cm are compared to various Hubble Space Telescope images, and we find a striking morphological similarity between high resolution Hα and short wavelength radio continuum em...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201117551