Results 91 to 100 of about 2,544 (230)

Stellar Abundances in Dwarf Irregular Galaxies

, 2003
Dwarf irregular galaxies appear to have undergone very slow chemical evolution since they have low nebular abundances, but have had ongoing star formation over the past 15 Gyr. They are too distant for red giant abundance analyses to examine the details of their chemical evolution, however the isolated, bright blue supergiants do allow us to determine ...
Venn, K.A., Tolstoy, E., Kaufer, A., Kudritzki, R.P.   +3 more
openaire   +3 more sources

A neutral-hydrogen survey of the dwarf irregular galaxy Leo A [PDF]

, 1978
N. J. Allsopp
openalex   +1 more source

The Neutral Hydrogen Distribution in Spiral and Irregular Galaxies [PDF]

, 1972
R. D. Davies
openalex   +1 more source

IUE spectra of clumpy irregular galaxies⋆ [PDF]

Monthly Notices of the Royal Astronomical Society, 1982
BENVENUTI, PIERO, C. Casini, J. Heidmann
openaire   +4 more sources

An Aperture Synthesis Study of H I in the Irregular II Galaxy NGC 3077 [PDF]

, 1976
G. A. Cottrell
openalex   +1 more source

Chemical evolution of irregular galaxies

, 1998
10 pages, 3 figs, uses moriond.sty. Review presented at XVIIIth Rencontre de Moriond `Dwarf Galaxies and Cosmology', eds.
openaire   +2 more sources

The JWST Resolved Stellar Populations Early Release Science Program. VIII. The Spatially Resolved Star Formation History of WLM

The Astrophysical Journal
Radial stellar population gradients within dwarf galaxies provide a promising avenue for disentangling the drivers of galaxy evolution, including environment. Within the Local Volume, radial stellar age gradient slopes correlate with interaction history,
Roger E. Cohen, Kristen B. W. McQuinn, Alessandro Savino, Max J. B. Newman, Daniel R. Weisz, Andrew E. Dolphin, Martha L. Boyer, Matteo Correnti, Marla C. Geha, Mario Gennaro, Karoline M. Gilbert, Nitya Kallivayalil, Jack T. Warfield, Benjamin F. Williams, Alyson M. Brooks, Andrew A. Cole, Evan D. Skillman, Christopher T. Garling, Jason S. Kalirai, Jay Anderson   +19 more
doaj   +1 more source

Genuine Irregular Galaxies as a Relic of Building Blocks of Galaxies

, 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., Taniguchi, Y., Kajisawa, M., Shioya, Y., Kobayashi, M. A. R., Matsuoka, K., Ikeda, H., Murata, K. L., Ichikawa, A., Shimizu, M., Niida, M., Hamaguchi, E.   +11 more
openaire   +2 more sources

What Does the LMC Look Like? It Depends on [M/H] and Age

The Astrophysical Journal
We offer a new way to look at the LMC through stellar mono-abundance and mono-age mono-abundance maps. These maps are based on ≳500,000 member stars with estimates of [M/H] ( σ _[M/H]  ~ 0.17) and age $({\sigma }_{{\rm{log}}\tau }\unicode{x0007E}0.15$ ),
Neige Frankel, Rene Andrae, Hans-Walter Rix, Joshua Povick, Vedant Chandra   +4 more
doaj   +1 more source

On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources

Physics Letters B, 2020
Photons may convert to axion-like particles (ALPs) in external magnetic fields. Under certain conditions, this effect should result in irregular features in observed spectra of astrophysical sources.
Maxim Libanov, Sergey Troitsky
doaj