Results 1 to 10 of about 183 (164)
The intrinsic shapes of dwarf irregular galaxies [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2013 Abstract We use the measured B-band axial ratios of galaxies from an updated catalogue of Local Volume galaxies to determine the intrinsic shape of dwarf irregular galaxies (de Vaucouleurs’ morphological types 8–10). We find that the shapes change systematically with luminosity, with fainter galaxies being thicker.
Jayaram Chengalur +2 more
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Redshift, metallicity and size of two extended dwarf Irregular galaxies. A link between dwarf Irregulars and ultra diffuse galaxies? [PDF]
Monthly Notices of the Royal Astronomical Society, 2017 We present the results of the spectroscopic and photometric follow-up of two field galaxies that were selected as possible stellar counterparts of local high velocity clouds. Our analysis shows that the two systems are distant (D>20 Mpc) dwarf irregular galaxies unrelated to the local HI clouds.
Michele Bellazzini +2 more
exaly +5 more sources
Chemical evolution of dwarf irregular and blue compact galaxies [PDF]
Astronomy and Astrophysics, 2011 Dwarf irregular and blue compact galaxies are very interesting objects since they are relatively simple and unevolved. We present new models for the chemical evolution of these galaxies by assuming different regimes of star formation (bursting and continuous) and different kinds of galactic winds (normal and metal-enhanced).
Giovanni Vladilo
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The metallicity-luminosity relationship of dwarf irregular galaxies [PDF]
Astronomy and Astrophysics, 2003 The nature of a possible correlation between metallicity and luminosity for dwarf irregular galaxies, including those with the highest luminosities, has been explored using simple chemical evolutionary models. Our models depend on a set of free parameters in order to include infall and outflows of gas and covering a broad variety of physical situations.
F J Sanchez-Salcedo
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The Interstellar Medium in Dwarf Irregular Galaxies
Annual Review of Astronomy and AstrophysicsDwarf irregular (dIrr) galaxies are among the most common type of galaxy in the Universe. They typically have gas-rich, low-surface-brightness, metal-poor, and relatively thick disks. Here, we summarize the current state of our knowledge of the interstellar medium (ISM), including atomic, molecular, and ionized gas, along with ...
Bruce Elmegreen +2 more
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The chemical abundances in a sample of dwarf irregular galaxies [PDF]
Astronomy and Astrophysics, 2001 Deep groundbased spectra of Hubble V and Hubble X, the two largest and brightest H ii regions in the Local Group dwarf galaxy, NGC 6822, are presented. The extinction, excitation and ionization are studied on scales as small as 4 pc. The chemical composition of some elements within the regions as well as possible small scale variations in the ...
J Masegosa
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THE OUTER DISKS OF DWARF IRREGULAR GALAXIES [PDF]
The Astronomical Journal, 2011 AJ, in ...
Hunter, Deidre A. +7 more
openaire +2 more sources
The Open Journal of Astrophysics, 2021 Countless low-surface brightness objects - including spiral galaxies, dwarf galaxies, and noise patterns - have been detected in recent large surveys.
Oliver Müller, Eva Schnider
doaj +1 more source
Giant halos in dwarf irregular galaxies vs. dwarf elliptical galaxies [PDF]
Proceedings of the International Astronomical Union, 2005 We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the optical images, and 2) it is elongated in the direction almost perpendicular to the HI disk of NGC 6822.
Lee, Myung Gyoon, Hwang, Narae
openaire +2 more sources
The Astrophysical Journal, 2023 We study the morphologies and structures of 57 dwarf galaxies that are representative of the general population of dwarf galaxies and compare their demographics to a sample of dwarf galaxies hosting optically selected active galactic nuclei (AGNs).
Seth J. Kimbrell +3 more
doaj +1 more source