Results 161 to 170 of about 202 (183)
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Abundances in dwarf irregular galaxies
Publications of the Astronomical Society of the Pacific, 1986The results of abundance studies of dwarf irregular galaxies and similar objects are reviewed with special attention to variations in the CNO element group. Observations of the forbidden N II and semiforbidden C III lines in the most metal-poor galaxy known, IZw 18, are presented for the first time and CNO abundances are derived via a photoionization ...
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2004
Dwarf irregular galaxies at optical wavelengths are small, faint and appear to be unstructured and irregular in shape. They are typically gas-rich, metal-poor systems, with varying levels of STAR FORMATION occurring in a haphazard manner across the ...
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Dwarf irregular galaxies at optical wavelengths are small, faint and appear to be unstructured and irregular in shape. They are typically gas-rich, metal-poor systems, with varying levels of STAR FORMATION occurring in a haphazard manner across the ...
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Blue Compact Dwarfs: Extreme Dwarf Irregular Galaxies
1987In Hubble’s classification scheme, dwarf irregular galaxies (dIs) are low luminosity systems (MB≳ -16) which are at the end of the galaxy morphological sequence and which lack both a dominating nucleus and rotational symmetry [1]. We concentrate here on a class of dIs which are so extreme in these properties that they appear almost stellar in ...
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A constant intrinsic thickness for dwarf irregular galaxies?
Monthly Notices of the Royal Astronomical Society: Letters, 2016Abstract We assess the intrinsic thickness parameter, qo, for a sample of dwarf irregular galaxies and compare to larger, more massive spiral galaxy systems. We use optical photometry to determine b/a (minor-to-major axial ratio), and we use the H i kinematic inclination angle to derive qo.
Megan C. Johnson +3 more
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Dwarf Irregular Galaxies of the Local Group
2014Local Group dwarf irregulars (dIrrs) cover an enormous range in star formation properties. Here I discuss these tiny galaxies as probes of star formation at the extremes of low gas densities and low metallicities. We have learned that (1) Star formation is inefficient in dIrrs and yet at very low \(\Sigma_{\rm HI}\) (\(
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Confronting fuzzy dark matter with the rotation curves of nearby dwarf irregular galaxies
Astronomy and Astrophysics, 2023Jorge Martin Camalich, Giuliano Iorio
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The relation between atomic gas and star formation rate densities in faint dwarf irregular galaxies
Monthly Notices of the Royal Astronomical Society, 2014Jayaram Chengalur +2 more
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Thick gas discs in faint dwarf galaxies
Monthly Notices of the Royal Astronomical Society: Letters, 2010Jayaram Chengalur +2 more
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B, V, Iphotometry of 20 dwarf irregular galaxies within 10 Mpc
Monthly Notices of the Royal Astronomical Society, 2009R B Tully, I Karachentsev
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