Dynamics of starbursting dwarf galaxies: I Zw 18
نویسندگان
چکیده
منابع مشابه
Star formation in Blue Compact Dwarf Galaxies : Mkn 104 and I Zw 97
Two blue compact dwarf galaxies Mkn 104 and I Zw 97 are studied photometrically and spectroscopically. Mkn 104 is found to contain three distinct bright star forming regions, whereas I Zw 97 is found to contain three bright and two faint star forming regions. Medium resolution spectra of three bright H ii regions in the two galaxies were obtained. Estimation of oxygen abundance in these regions...
متن کاملThe Low Co Content of the Extremely Metal Poor Galaxy I Zw 18
We present sensitive molecular line observations of the metal-poor blue compact dwarf I Zw 18 obtained with the IRAM Plateau de Bure interferometer. These data constrain the CO J = 1 → 0 luminosity within our 300 pc (FWHM) beam to be LCO < 1×10 5 K km s pc (ICO < 1 K km s ), an order of magnitude lower than previous limits. Although I Zw 18 is starbursting, it has a CO luminosity similar to or ...
متن کاملIsolating 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 کاملHigh-redshift Starbursting Dwarf Galaxies Revealed by Γ-ray Burst Afterglows1,2
We present a study of 15 long-duration γ-ray burst (GRB) host galaxies at z > 2. The GRBs are selected with available early-time afterglow spectra in order to compare interstellar medium (ISM) absorption-line properties with stellar properties of the host galaxies. In addition to five previously studied hosts, we consider new detections for the host galaxies of GRB 050820 and GRB 060206 and pla...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201117867