Results 41 to 50 of about 33,724 (268)

Dark matter constraints from a joint analysis of dwarf Spheroidal galaxy observations with VERITAS [PDF]

open access: yes, 2017
We present constraints on the annihilation cross section of weakly interacting massive particles dark matter based on the joint statistical analysis of four dwarf galaxies with VERITAS.
V. C. S. Archambault   +153 more
semanticscholar   +1 more source

Zwicky Transient Facility and Globular Clusters: The Period–Luminosity and Period–Wesenheit Relations for SX Phoenicis Variables in the gri Band

open access: yesThe Astronomical Journal, 2023
SX Phoenicis (SXP) variables are short-period pulsating stars that exhibit a period–luminosity (PL) relation. We derived the gri -band PL and extinction-free period–Wesenheit (PW) relations, as well as the period-color and reddening-free period-Q-index ...
Chow-Choong Ngeow   +6 more
doaj   +1 more source

Structure of the Draco Dwarf Spheroidal Galaxy [PDF]

open access: yesThe Astronomical Journal, 2002
25 pages, 11 figures, 3 tables.
Slawomir Piatek   +3 more
openaire   +4 more sources

Detection of a Population of Carbon-enhanced Metal-poor Stars in the Sculptor Dwarf Spheroidal Galaxy [PDF]

open access: yes, 2018
The study of the chemical abundances of metal-poor stars in dwarf galaxies provides a venue to constrain paradigms of chemical enrichment and galaxy formation.
A. Chiti   +8 more
semanticscholar   +1 more source

Dark Matter Halo Properties of the Galactic Dwarf Satellites: Implication for Chemo-dynamical Evolution of the Satellites and a Challenge to Lambda Cold Dark Matter

open access: yesThe Astrophysical Journal, 2023
Elucidating dark matter density profiles in Galactic dwarf satellites is essential to understanding not only the quintessence of dark matter, but also the evolution of the satellites themselves.
Kohei Hayashi   +3 more
doaj   +1 more source

The Chemical Signature of a Relic Star Cluster in the Sextans Dwarf Spheroidal Galaxy - Implications for Near-Field Cosmology [PDF]

open access: yes, 2012
We present tentative evidence for the existence of a dissolved star cluster at [Fe/H]=-2.7 in the Sextans dwarf spheroidal galaxy. We use the technique of chemical tagging to identify stars that are highly clustered in a multi-dimensional chemical ...
Bland-Hawthorn, Joss   +3 more
core   +2 more sources

The Origin Of Dwarf Spheroidal Galaxies [PDF]

open access: yesSymposium - International Astronomical Union, 1983
Two dwarf spheroidal galaxies are associated with the Magellanic Stream with their major axes oriented along it. Evidence suggests that all the dwarf spheroidal satellites of the Galaxy belong to one or other of two streams of tidal debris. If this is true the orbits will give the first reliable determination of the total mass of the Galaxy out to 120 ...
openaire   +2 more sources

Abundance Analysis of Stars at Large Radius in the Sextans Dwarf Spheroidal Galaxy

open access: yesThe Astrophysical Journal, 2023
We present the stellar parameters and chemical abundances of 30 elements for five stars located at large radii (3.5–10.7 times the half-light radius) in the Sextans dwarf spheroidal galaxy. We selected these stars using proper motions, radial velocities,
Ian U. Roederer   +7 more
doaj   +1 more source

A discrete chemo-dynamical model of the dwarf spheroidal galaxy Sculptor: mass profile, velocity anisotropy and internal rotation [PDF]

open access: yes, 2016
We present a new discrete chemo-dynamical axisymmetric modelling technique, which we apply to the dwarf spheroidal galaxy Sculptor. The major improvement over previous Jeans models is that realistic chemical distributions are included directly in the ...
Ling Zhu, G. Ven, L. Watkins, L. Posti
semanticscholar   +1 more source

Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS

open access: yesThe Astrophysical Journal, 2023
Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) a leading dark matter candidate. WIMPs have not been detected in their conventional parameter space (100 GeV ≲ M _χ ≲ 100 TeV), a mass ...
A. Acharyya   +53 more
doaj   +1 more source

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