Results 21 to 30 of about 159,319 (262)

Mass Modelling of dwarf Spheroidal Galaxies [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractWe study the origin and properties of unbound stars in the kinematic samples of dwarf spheroidal galaxies. For this purpose we have run a high resolution N-body simulation of a two-component dwarf galaxy orbiting in a Milky Way potential. We create mock kinematic data sets by observing the dwarf in different directions.
Klimentowski, J, Łokas, E L, Kazantzidis, S, Prada, F, Mayer, L, Mamon, G A   +5 more
openaire   +3 more sources

Dwarf spheroidal galaxies: Keystones of galaxy evolution [PDF]

Publications of the Astronomical Society of the Pacific, 1994
Dwarf spheroidal galaxies are the most insignificant extragalactic stellar systems in terms of their visibility, but potentially very significant in terms of their role in the formation and evolution of much more luminous galaxies. We discuss the present observational data and their implications for theories of the formation and evolution of both dwarf
John S. Gallagher, Rosemary F. G. Wyse
openaire   +3 more sources

The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients [PDF]

, 2006
In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. Identify red giant branch stars that are members in a dwarf spheroidal galaxy. 2.
A. Ardeberg, Anthony-Twarog, Aparicio, Armandroff, Ashman, Baade, Bell, Bell, Bellazzini, Bergbusch, Bonanos, Bond, Cardelli, Carney, Carretta, Cioni, Clem, Crawford, Crawford, D. Faria, Dolphin, Fulbright, G. Gilmore, G. M. Wahlgren, Grebel, Grillmair, Grundahl, Gustafsson, Harbeck, Hartwick, Heiter, Hilker, Hodge, I. Lundström, Irwin, Irwin, Kleyna, Koch, Lehnert, Muñoz, Odenkirchen, Olsen, Olsen, Olsen, Olsen, Olszewski, P. Linde, S. Feltzing, Schlegel, Schuster, Schuster, Shapley, Shetrone, Shetrone, Smith, Stetson, Stetson, Stetson, Wilkinson, Zinn, Zinn, Zinn, Zinn   +62 more
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Dwarf Spheroidal Galaxies [PDF]

Symposium - International Astronomical Union, 1994
Dwarf Spheroidal (dSph) galaxies are the faintest baryonic systems recognized as galaxies. Understanding the structure and stellar populations of these systems is critical for the modelling of their formation and evolution, and by extension, for understanding the general problem of galaxy formation ...
openaire   +2 more sources

On the Origins of Extreme Velocity Stars as Revealed by Large-scale Galactic Surveys

The Astronomical Journal, 2023
We assemble a large sample of 12,784 high-velocity stars with total velocity V _GSR ≥ 300 km s ^−1 , selected from RAVE DR5, SDSS DR12, LAMOST DR8, APOGEE DR16, GALAH DR2, and Gaia EDR3.
Qing-Zheng Li, Yang Huang, Xiao-Bo Dong, Hua-Wei Zhang, Timothy C. Beers, Zhen Yuan   +5 more
doaj   +1 more source

The early days of the Sculptor dwarf spheroidal galaxy [PDF]

Astronomy & Astrophysics, 2015
Replacement after language ...
Pierre North, Amina Helmi, Pascale Jablonka, Pascale Jablonka, Francesca Primas, Giuseppina Battaglia, Giuseppina Battaglia, Lyudmila Mashonkina, Kim Venn, Matthew Shetrone, P. François, Else Starkenburg, Else Starkenburg, Vanessa Hill, Yves Revaz, Eline Tolstoy, Mike Irwin   +16 more
openaire   +10 more sources

A systematic study of hidden sector dark matter: application to the gamma-ray and antiproton excesses

Journal of High Energy Physics, 2020
In hidden sector models, dark matter does not directly couple to the particle content of the Standard Model, strongly suppressing rates at direct detection experiments, while still allowing for large signals from annihilation.
Dan Hooper, Rebecca K. Leane, Yu-Dai Tsai, Shalma Wegsman, Samuel J. Witte   +4 more
doaj   +1 more source

The chemical evolution of the dwarf spheroidal galaxy Sextans [PDF]

Astronomy & Astrophysics, 2020
We present our analysis of the FLAMES dataset targeting the central 25′ region of the Sextans dwarf spheroidal galaxy (dSph). This dataset is the third major part of the high-resolution spectroscopic section of the ESO large program 171.B-0588(A) obtained by the Dwarf galaxy Abundances and Radial-velocities Team.
Kim Venn, Matthew Shetrone, Pascale Jablonka, Pascale Jablonka, Amina Helmi, Carmela Lardo, Eline Tolstoy, Giuseppina Battaglia, Giuseppina Battaglia, Vanessa Hill, Pierre North, Mike Irwin, R. Lucchesi, R. Theler, Andreas Kaufer, Francesca Primas   +15 more
openaire   +10 more sources

ZIRCONIUM ABUNDANCES IN THE CENTRAL PART OF THE dSph FORNAX GALAXY

Odessa Astronomical Publications, 2017
We derived LTE zirconium abundance in a sample of 81 giant stars in dwarf spheroidal Fornax galaxy. The LTE synthesis was used for this aim. We obtained the lower Zr abundance in Fornax galaxy comparing to the relevant value in the thick/thin disc of the
S. M. Andrievsky, S. A. Korotin, V. Hill, A. V. Zhukova   +3 more
doaj   +1 more source

The internal kinematics of dwarf spheroidal galaxies [PDF]

EAS Publications Series, 2006
8 pages, 5 figs. Invited review in Proceedings of XXIst IAP Colloquium, "Mass Profiles & Shapes of Cosmological Structures" (Paris, 4-9 July 2005), eds G.A. Mamon, F. Combes, C. Deffayet, B. Fort (Paris: EDP Sciences)
Wilkinson, M. I., Kleyna, Jan, Evans, N. W., Gilmore, G., Read, J. I., Koch, Andreas, Grebel, E. K., Irwin, M.   +7 more
openaire   +5 more sources