Results 81 to 90 of about 12,845 (268)

The dwarf spheroidal galaxy Andromeda I

The Astrophysical Journal, 1990
Images of Andromeda I in the visual and near-infrared show a giant branch characteristic of galactic globular clusters of intermediate metallicity. The distance of the galaxy is estimated from the tip of the giant branch to be 790 + or - 60 kpc. The physical dimensions and luminosity are similar to those of the dwarf spheroidal in Sculptor. There is no
Jeremy Mould, Jerome Kristian
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Zinc abundances in the Sculptor dwarf spheroidal galaxy^, [PDF]

Astronomy & Astrophysics, 2017
From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have been made in ≈100 individual red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy. This is the largest sample of individual Zn abundance measurements within a stellar system beyond the Milky Way.
Skuladottir, A., Tolstoy, E., SALVADORI, STEFANIA, Hill, V., Pettini, M.   +4 more
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The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VIII. A Census of Long-period Variable Stars across the Andromeda Dwarf Satellite System

The Astrophysical Journal
We present a comprehensive catalog, in the Sloan i and Harris V filters, of long-period variable (LPV) stars in the spheroidal dwarf satellites of the Andromeda galaxy based on a dedicated survey for variable stars in Local Group dwarf systems.
Hedieh Abdollahi, Atefeh Javadi, Jacco Th. van Loon, Iain McDonald, Mahdi Abdollahi, Elham Saremi, Habib G. Khosroshahi, László Molnár, Hamidreza Mahani   +8 more
doaj   +1 more source

Exploring the Structures and Substructures of the Andromeda Satellite Dwarf Galaxies Cassiopeia III, Perseus I, and Lacerta I

The Astronomical Journal, 2023
We present results from wide-field imaging of the resolved stellar populations of the dwarf spheroidal galaxies Cassiopeia III (And XXXII) and Perseus I (And XXXIII), two satellites in the outer stellar halo of the Andromeda galaxy (M31).
Katherine L. Rhode, Nicholas J. Smith, Denija Crnojevic, David J. Sand, Ryan A. Lambert, Enrico Vesperini, Madison V. Smith, Steven Janowiecki, John J. Salzer, Ananthan Karunakaran, Kristine Spekkens   +10 more
doaj   +1 more source

Dwarf Spheroidal Galaxies and Globular Clusters [PDF]

Symposium - International Astronomical Union, 1988
Recent observational results for dwarf spheroidal galaxies are reviewed and discussed. In particular, the differences in stellar populations between dwarf spheroidal galaxies and globular clusters are highlighted. It seems most probable that the origin and evolution of dwarf spheroidal galaxies was very different from that of globular clusters.
openaire   +1 more source

Maximally self-interacting dark matter: models and predictions

Journal of High Energy Physics, 2020
We study self-interacting dark matter (SIDM) scenarios, where the s-wave self-scattering cross section almost saturates the Unitarity bound. Such self-scattering cross sections are singly parameterized by the dark matter mass, and are featured by strong ...
Ayuki Kamada, Hee Jung Kim, Takumi Kuwahara   +2 more
doaj   +1 more source

Simulations of the formation and evolution of isolated dwarf galaxies [PDF]

, 2008
We present new fully self-consistent models of the formation and evolution of isolated dwarf galaxies. We have used the publicly available N-body/SPH code HYDRA, to which we have added a set of star formation criteria, and prescriptions for chemical ...
De Rijcke, S., Dejonghe, H., Valcke, Sander   +2 more
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Sulphur in the Sculptor dwarf spheroidal galaxy [PDF]

Astronomy & Astrophysics, 2015
9 pages, 11 figures, 2 tables + 3 online tables, accepted in A& ...
Skúladóttir, Á., Andrievsky, S. M., Tolstoy, E., Hill, V., SALVADORI, STEFANIA, Korotin, S. A., Pettini, M.   +6 more
openaire   +3 more sources

Tracing satellite planes in the Sculptor group

Astronomy & Astrophysics
Context. Although substantial progress has been made in reconciling lambda cold dark matter (ΛCDM) simulations with the observed abundance and distribution of satellite galaxies, important tensions persist.
Martínez-Delgado David, Stein Michael, Pawlowski Marcel S., Sakowska Joanna D., Makarov Dmitry, Makarova Lidia, Donatiello Giuseppe, Lang Dustin   +7 more
doaj   +1 more source

THE HOT DARK MATTER MODEL: FURTHER INVESTIGATION

Odessa Astronomical Publications, 2020
e outer region with the dominant hot dark matter (the parabolic orbit of the test particle). It was assumed that the hot dark matter consists of hypothetical Planck neutrinos arising in the decay of the protons at the Planck scale.
D. L. Khokhlov
doaj   +1 more source