The Sculptor dwarf irregular galaxy SDIG: present and past
نویسندگان
چکیده
منابع مشابه
Associated with the Sculptor Dwarf Spheroidal Galaxy
Neutral hydrogen (H I ) has been detected in the Local Group dwarf spheroidal galaxy Sculptor with the 64 m Parkes single dish and mapped with the Australia Telescope synthesis array. Most of the detected H I is in two clouds ∼ 15 − 20 away from the optical center. The gas is observed at the same systemic velocity than the stars but at ≥ 125 km s away from the Magellanic Stream components in th...
متن کاملISM Abundances in Sculptor Group Dwarf Irregular Galaxies
Using the CTIO 4-m telescope, we have obtained optical spectra of HII regions in five Sculptor Group dwarf irregular galaxies. We derive oxygen, nitrogen, and sulfur abundances from the HII region spectra. Oxygen abundances are derived via three different methods (the “direct” method, the empirical method guided by photoionization modeling of McGaugh (1991), and the purely empirical method of P...
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We present sensitive and high resolution 21 cm observations of the dwarf irregular (dIm) galaxy DDO 43, in conjunction with optical broad and narrow band images in U, B, V, and Hα. The observations are used to examine the relationship between its H i morphology and kinematics to past and present star formation. Optically, it is a small (R25 = 990 pc), faint (MB of −14.0) Im with a slightly boxy...
متن کاملThe Star Formation History of the Pegasus Dwarf Irregular Galaxy
The star formation history (SFH) of the Pegasus dIr, a likely Local Group member at 0.95 Mpc from the Milky Way, is investigated. We characterize the SFH by two basic functions: the star formation rate, ψ(t), and the chemical enrichment law, Z(t). It has been derived by comparing the color-magnitude diagram of the resolved stars in Pegasus, with a total of 189 model diagrams produced with diffe...
متن کاملStar Formation in Sculptor Group Dwarf Irregular Galaxies and the Nature of “Transition” Galaxies
We present new Hα narrow band imaging of the HII regions in eight Sculptor Group dwarf irregular (dI) galaxies. The Hα luminosities of the detected HII regions range from some of the faintest detected in extragalactic HII regions (∼ 10 erg s in SC 24) to some of the most luminous (∼ 10 erg s in NGC 625). The total Hα luminosities are converted into current star formation rates (SFR). Comparing ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1997
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/285.2.374