Results 11 to 20 of about 599,828 (297)
The oxygen abundance deficiency in irregular galaxies [PDF]
New Astronomy Reviews, 2000 The observed oxygen abundances in a number of irregular galaxies have been compared with predictions of the closed-box model of chemical and photometric evolution of galaxies. Oxygen is found to be deficient with respect to the predicted abundances. This
Ferrini, F., Pilyugin, L. S.
core +6 more sources
Dark Matter and the Chemical Evolution of Irregular Galaxies [PDF]
The Astrophysical Journal, 1998 We present three types of chemical evolution models for irregular galaxies: closed-box with continuous star formation rates (SFRs), closed-box with bursting SFRs, and O-rich outflow with continuous SFRs. We discuss the chemical evolution of the irregular
Arimoto N. +25 more
core +7 more sources
ON THE RADIAL EXTENT OF THE DWARF IRREGULAR GALAXY IC10 [PDF]
The Astrophysical Journal, 2010 We present new deep and accurate space (Advanced Camera for Surveys–Wide Field Planetary Camera 2 on board the Hubble Space Telescope) and ground-based (Suprime-Cam at Subaru Telescope, Mega-Cam at Canada–France–Hawaii Telescope) photometric and ...
N. Sanna +18 more
semanticscholar +6 more sources
THE MAGNETIC FIELD OF THE IRREGULAR GALAXY NGC 4214 [PDF]
The Astrophysical Journal, 2011 We examine the magnetic field in NGC 4214, a nearby irregular galaxy, using multi-wavelength radio continuum polarization data from the Very Large Array.
A. Kepley +4 more
semanticscholar +5 more sources
The Full-fledged Dwarf Irregular Galaxy Leo A [PDF]
The Astrophysical Journal, 2004 We have studied Leo A, an isolated and extremely gas-rich dwarf irregular galaxy of very low stellar mass and metallicity. Ages of the stellar populations in Leo A range from ~10 Myr to ~10 Gyr.
V. Vansevičius +10 more
semanticscholar +5 more sources
Lopsidedness in dwarf irregular galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 42 pages, LaTex.
Ana Heller +4 more
openalex +4 more sources
Starbursts in Ring and Irregular Galaxies
Publications of the Astronomical Society of Australia, 1991 AbstractThis paper presents the current status of a Ph.D. project undertaken to search for extended-scale bursts of star formation (> 1 kpc) in irregular and collisionally produced ring galaxies, principally in the southern half of the sky. Results of recent 8.4 GHz radio continuum observations and UBVRI CCD imaging of some of the program galaxies ...
V. J. McIntyre, W. J. Zealey
openalex +3 more sources
Magnetic Fields in Irregular Galaxies [PDF]
Highlights of Astronomy, 2002 AbstractRadio data of large irregular galaxies reveal some extended synchrotron emission with a substantial degree of polarization. In the case of NGC 4449 strong galaxy-scale regular magnetic fields were found, in spite of the lack of ordered rotation required for the conventional dynamo action.
K. T. Chyży
openalex +3 more sources
Magnetic Fields in Irregular Galaxies [PDF]
Proceedings of the International Astronomical Union, 2008 Magnetic fields are an important component of the interstellar medium, especially in low-mass galaxies like irregulars where the magnetic pressure may be significant. However, few irregular galaxies have observed magnetic field structures. Using the VLA, the GBT, and the ATCA, we have observed several irregular galaxies in the radio continuum to ...
Timothy Robishaw +6 more
openaire +6 more sources
Luminous AGB variables in the dwarf irregular galaxy, NGC 3109 [PDF]
Monthly notices of the Royal Astronomical Society, 2018 In a shallow near-infrared survey of the dwarf Irregular galaxy, NGC 3109, near the periphery of the Local Group, we have found eight Mira variables, seven of which appear to be oxygen-rich (O-Miras).
J. Menzies +3 more
semanticscholar +1 more source