Results 1 to 10 of about 693,331 (292)
Magnetic Fields in Irregular Galaxies [PDF]
, 2007 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
arxiv +5 more sources
Supernova Remnants in the Irregular Galaxy NGC 4449
The Astrophysical Journal, 2023 The nearby irregular galaxy NGC 4449 has a star formation rate of ∼0.4 M _☉ yr ^−1 and should host of order 70 supernova remnants (SNRs) younger than 20,000 yr, a typical age for SNRs expanding into an interstellar medium (ISM) with a density of 1 cm ^−3
P. Frank Winkler +2 more
doaj +3 more sources
Stellar Structure of Irregular Galaxies. Edge-On Galaxies [PDF]
Astron.Rep. 50 (2006) 517-525, 2006 Stellar photometry obtained using the Hubble Space Telescope is used to study the distributions of the number densities of stars of various ages in 12 irregular and dwarf spiral galaxies viewed edge-on. Two subsystems can be distinguished in all the galaxies: a thin disk comprised of young stars and a thick disk containing a large fraction of the old ...
arxiv +7 more sources
THE CHEMISTRY OF IRREGULAR GALAXIES [PDF]
arXiv, 1995 I review the current data on abundances in irregular galaxies, with special emphasis on recent results on C/O and Si/O from observations with the Hubble Space Telescope. The abundance data for He, C, N, and O in irregular galaxies is discussed in the context of models for the evolution of dwarf galaxies.
arxiv +3 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 galaxies NGC 1560 and II Zw 33, and a ``typical'' irregular galaxy.
L. Carigi, M. Peimbert, P. Colín
arxiv +7 more sources
Stellar Structure of Irregular Galaxies. I. Face-on Galaxies [PDF]
Astron.Rep. 49 (2005) 501-509, 2006 Stellar photometry of nearby irregular galaxies of the Local Group is used to identify and study the young and old stellar populations of these galaxies. An analysis of the spatial distributions of stars of different ages in face-on galaxies shows that the young stellar populations in irregular galaxies are concentrated toward the center, and form ...
arxiv +3 more sources
The extended structure of the dwarf irregular galaxy Sagittarius [PDF]
Astronomy & Astrophysics, 2014 We present a detailed study of the stellar and HI structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to ~5.0' (corresponding to ~1600 pc) and down to $ _V\simeq 30.0$ mag/arcsec$^2$, thus showing that the stellar body of the galaxy is much more ...
Vincenzo Testa +9 more
openaire +8 more sources
Chemical evolution of irregular galaxies [PDF]
arXiv, 1998 The state-of-the-art of chemical evolution models for Irregular and Blue Compact galaxies is reviewed. The resulting scenarios for the initial mass function, the regime of star formation and the efficiency of gas outflows are described: The IMF appears to be roughly the same everywhere; the SF has possibly followed a bursting regime in BCGs and a more ...
arxiv +3 more sources
Genuine Irregular Galaxies as a Relic of Building Blocks of Galaxies [PDF]
arXiv, 2013 In order to understand nature of building blocks of galaxies in the early universe, we investigate "genuine irregular galaxies (GIGs)" in the nearby universe. Here, GIGs are defined as isolated galaxies without regular structures (spheroid, bulge, disk, bar, spiral arm, and nucleus). Using the results of two excellent studies on galaxy morphology based
Terao, K. +11 more
arxiv +3 more sources
ON THE RADIAL EXTENT OF THE DWARF IRREGULAR GALAXY IC10 [PDF]
The Astrophysical Journal, 2010 7 pages, 4 figures, ApJ Letters ...
Michele Cignoni +18 more
openaire +6 more sources