Results 181 to 190 of about 445,447 (209)
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).
Francesca Matteucci
exaly +5 more sources
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 N. Chengalur +2 more
exaly +4 more sources
Thick gas discs in faint dwarf galaxies
Monthly Notices of the Royal Astronomical Society: Letters, 2010 We determine the intrinsic axial ratio distribution of the gas discs of extremely faint MB < −14.5 dwarf irregular galaxies. We start with the measured (beam corrected) distribution of apparent axial ratios in the HI 21-cm images of dwarf irregular ...
Jayaram N. Chengalur +2 more
exaly +2 more sources
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
exaly +4 more sources
The fundamental plane of dwarf irregular galaxies * [PDF]
Astronomy and Astrophysics, 2008 Aims. Near-IR photometry of dwarf irregular galaxies (dIs) has been acquired to expand the sample of objects suitable for investigating the fundamental plane (FP) discovered previously by us. Data for blue compact dwarfs (BCDs), dwarf ellipticals (dEs), and dwarf spheroidal galaxies (dSphs) are amalgamated to evaluate how closely these classes of ...
Ovidiu Horațiu Văduvescu, M L McCall
exaly +2 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
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 ...
openaire +1 more source
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 ...
openaire +2 more sources
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 ...
openaire +2 more sources
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
exaly +2 more sources
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 ...
openaire +1 more source
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
openaire +1 more source