Results 111 to 120 of about 170,345 (283)
The mass of dwarf spheroidal galaxies and the missing satellite problem [PDF]
, 2005 We present the results from a suite of N-body simulations of the tidal stripping of two-component dwarf galaxies comprising some stars and dark matter. We show that recent kinematic data from the local group dwarf spheroidal (dSph) galaxies suggests that dSph galaxies must be sufficiently massive ($10^9 - 10^{10}$M$_\odot$) that tidal stripping is of ...
arxiv +1 more source
Dark Matter Halos from the Inside Out
Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011 The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley +1 more source
Chemical compositions of six metal-poor stars in the ultra-faint dwarf spheroidal galaxy Boötes I [PDF]
, 2014 Context. Ultra-faint dwarf galaxies recently discovered around the Milky Way (MW) contain extremely metal-poor stars, and might represent the building blocks of low-metallicity components of the MW.
M. Ishigaki +3 more
semanticscholar +1 more source
THE CHEMICAL EVOLUTION OF THE DRACO DWARF SPHEROIDAL GALAXY [PDF]
The Astrophysical Journal, 2009 We present an abundance analysis based on high resolution spectra of 8 stars selected to span the full range in metallicity in the Draco dwarf spheroidal galaxy. We find [Fe/H] for the sample stars ranges from -1.5 to -3.0 dex. Combining our sample with previously published work for a total of 14 luminous Draco giants, we show that the abundance ratios
Cohen, Judith G., Huang, Wenjin
openaire +5 more sources
An Analytical Galactic Chemical Evolution Model with Gas Inflow and a Terminal Wind
The Astrophysical JournalWe present a new analytical galactic chemical evolution (GCE) model with gas inflow, internally caused outflow, and extra gas loss after a period of time. The latter mimics the ram pressure stripping of a dwarf satellite galaxy near the pericenter of its
Kateryna A. Kvasova, Evan N. Kirby
doaj +1 more source
Abundance ratios of red giants in low mass ultra faint dwarf spheroidal galaxies [PDF]
A&A 588, A7 (2016), 2015 Low mass dwarf spheroidal galaxies are key objects for our understanding of the chemical evolution of the pristine Universe and the Local Group of galaxies. Abundance ratios in stars of these objects can be used to better understand their star formation and chemical evolution.
arxiv +1 more source
The episodic star formation history of the Carina dwarf spheroidal galaxy [PDF]
, 2014 We present deep photometry of the Carina dwarf spheroidal galaxy in the B and V filters from CTIO/MOSAIC out to and beyond the tidal radius of rell ≈ 0.48 degrees.
T. D. Boer +7 more
semanticscholar +1 more source
The effect of tides on the Sculptor dwarf spheroidal galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 AbstractDwarf spheroidal galaxies (dSphs) appear to be some of the most dark matter (DM)-dominated objects in the Universe. Their dynamical masses are commonly derived using the kinematics of stars under the assumption of equilibrium. However, these objects are satellites of massive galaxies (e.g.
Carlo Nipoti +4 more
openaire +6 more sources
Assessment of Dark Matter Models Using Dark Matter Correlations across Dwarf Spheroidal Galaxies
Universe, 2022 The predicted size of dark matter substructures in kilo-parsec scales is model-dependent. Therefore, if the correlations between dark matter mass densities as a function of the distances between them are measured via observations, we can scrutinize dark ...
Ahmad Borzou
doaj +1 more source
CHEMICAL SIGNATURES OF THE FIRST SUPERNOVAE IN THE SCULPTOR DWARF SPHEROIDAL GALAXY [PDF]
, 2014 We present a homogeneous chemical abundance analysis of five of the most metal-poor stars in the Sculptor dwarf spheroidal galaxy. We analyze new and archival high resolution spectroscopy from Magellan/MIKE and VLT/UVES and determine stellar parameters ...
J. Simon +5 more
semanticscholar +1 more source