Chemical enrichment and physical conditions in I Zw 18
نویسندگان
چکیده
منابع مشابه
Astronomy 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...
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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 کاملKinematic Evidence for Superbubbles in I Zw 18: Constraints on the Star Formation History and Chemical Evolution
We have combined measurements of the kinematics, morphology, and oxygen abundance of the ionized gas in I Zw 18, one of the most metal-poor galaxies known, to examine the star formation history and chemical mixing processes. Deep Hα imagery shows diffuse emission and a partial shell extending well beyond the main two knots of continuum emission. We have explored the kinematics of this ionized g...
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 کاملArgon and Silicon abundances in the damped Ly α system I Zw 18
We show that the difference between the Ar and Si relative abundance ratio derived from FUSE absorption spectra and from the H ii regions of I Zw 18 is a consequence of the microturbulent analysis applied to the absorption spectra. FUSE observations were performed with a large entrance aperture which fully covered the galaxy. This means that the observed profiles are averaged over the full body...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2013
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201220948