Results 101 to 110 of about 33,724 (268)

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, W. Aoki, N. Arimoto, S. Okamoto   +3 more
semanticscholar   +1 more source

An Analytical Galactic Chemical Evolution Model with Gas Inflow and a Terminal Wind

The Astrophysical Journal
We 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

Dark Matter Gamma-ray searches in Galaxy Clusters: Status and prospects [PDF]

EPJ Web of Conferences
Galaxy clusters are the largest structures in the Universe, being dark matter (DM) dominated objects. For DM decay, they yield the highest expected fluxes with respect to other prime targets.
Pérez-Romero Judit
doaj   +1 more source

A MegaCam Survey of Outer Halo Satellites. VII. A Single S\'ersic Index v/s Effective Radius Relation for Milky Way Outer Halo Satellites

, 2019
In this work we use structural properties of Milky Way's outer halo ($R_G > 25\,\mathrm{kpc}$) satellites (dwarf spheroidal galaxies, ultra-faint dwarf galaxies and globular clusters) derived from deep, wide-field and homogeneous data, to present ...
Carballo-Bello, Julio A., Chanamé, Julio, Djorgovski, S. G., Geha, Marla, Marchi-Lasch, Sebastián, Muñoz, Ricardo R., Santana, Felipe A., Simon, Joshua D., Stetson, Peter B.   +8 more
core   +1 more source

The Star Formation History of the Carina Dwarf Galaxy [PDF]

, 1998
We have analyzed deep B and V photometry of the Carina dwarf spheroidal reaching below the old main-sequence turnoff to about V = 25. Using simulated color-magnitude diagrams to model a range of star formation scenarios, we have extracted a detailed ...
Cannon R. D., Denise Hurley-Keller, Fusi Pecci F., Glazebrook K., James Nemec, Mario Mateo, Mighell K. J., Mighell K. J., Vallenari A., Vallenari A.   +9 more
core   +3 more sources

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, E. Tolstoy, B. Lemasle, A. Saha, E. Olszewski, M. Mateo, M. Irwin, G. Battaglia   +7 more
semanticscholar   +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, H. Jacobson, A. Frebel, I. Thompson, J. Adams, S. Shectman   +5 more
semanticscholar   +1 more source

Faint Stars in a Faint Galaxy. II. The Low-mass Stellar Initial Mass Function of the Boötes I Ultrafaint Dwarf Spheroidal Galaxy

The Astrophysical Journal, 2022
This paper presents improved constraints on the low-mass stellar initial mass function (IMF) of the Boötes I (Boo I) ultrafaint dwarf galaxy, based on our analysis of recent deep imaging from the Hubble Space Telescope.
Carrie Filion, Imants Platais, Rosemary F. G. Wyse, Vera Kozhurina-Platais   +3 more
doaj   +1 more source

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

Lambda-Cold Dark Matter, Stellar Feedback, and the Galactic Halo Abundance Pattern [PDF]

, 2005
(Abridged) The hierarchical formation scenario for the stellar halo requires the accretion and disruption of dwarf galaxies, yet low-metallicity halo stars are enriched in alpha-elements compared to similar, low-metallicity stars in dwarf spheroidal ...
Andreea S. Font, Bondi H., Brant Robertson, Devriendt J. E. G., Gratton R. G., Gratton R. G., Gratton R. G., Greggio L., Hill V., Hill V., Hill V., Hill V., James S. Bullock, Jasniewicz G., Kathryn V. Johnston, Lacey C., Lars Hernquist, Matteucci F., Matteucci F., Matteucci F., Moore B., Nissen P. E., Pagel B. E. J., Schaller G., Tinsley B. M., Tinsley B. M., Tsujimoto T., Unavane M.   +27 more
core   +2 more sources