Results 11 to 20 of about 12,885 (260)

Tidal Dwarf Galaxies and Missing Baryons [PDF]

Advances in Astronomy, 2010
Tidal dwarf galaxies form during the interaction, collision, or merger of massive spiral galaxies. They can resemble “normal” dwarf galaxies in terms of mass, size, and become dwarf satellites orbiting around their massive progenitor.
Frederic Bournaud
doaj   +4 more sources

The Andromeda Dwarf Spheroidal Galaxies [PDF]

Symposium - International Astronomical Union, 1999
Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal branch have been constructed for two M31 dwarf spheroidals, based on images from HST/WFPC2. The horizontal branches are predominantly red in both galaxies,
T. E. Armandroff, G. S. Da Costa
openalex   +4 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
Gallagher III, John S., Wyse, Rosemary F. G.   +1 more
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The Progenitors of Dwarf Spheroidal Galaxies [PDF]

The Astronomical Journal, 2003
Dwarf spheroidal (dSph) galaxies present an evolutionary puzzle that we explore in 40 early- and late-type dwarfs in the Local Group and nearby field. Although dSphs formed stars over extended periods, today all but one are free of detectable interstellar matter (ISM), even in the Fornax dSph, where stars still formed 100 Myr ago.
E. K. Grebel, J. S. Gallagher, Daniel Harbeck   +2 more
openalex   +5 more sources

Globular Clusters and Dwarf Spheroidal Galaxies [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2007
Traditionally globular clusters and dwarf spheroidal galaxies have been distinguished by using one or more of the following criteria: (1) mass, (2) luminosity, (3) size, (4) mass-to-light ratio and (5) spread in metallicity.
Babcock H. W., Coleman M. G., Goodwin S. P., Sidney van den Bergh   +3 more
core   +4 more sources

The Effect of Tidal Stripping on Composite Stellar Populations in Dwarf Spheroidal Galaxies [PDF]

Advances in Astronomy, 2010
We use N-body simulations to study the effects of tides on the kinematical structure of satellite galaxies orbiting a Milky Way-like potential. Here we focus on the evolution of a spherical, dark matter dominated satellite, which is modelled with two ...
Laura V. Sales, Amina Helmi, Giuseppina Battaglia   +2 more
doaj   +4 more sources

Metallicity gradients in the Sagittarius dwarf spheroidal galaxy [PDF]

Astronomy & Astrophysics, 2001
Metallicity gradients in the Sagittarius dwarf Galaxy (Sgr) are investigated by using infrared photometric data from the 2MASS survey. To search for metallicity effects, the giant branch in a field situated near the Center of the Sgr is compared to the giant branch in a field situated near its southern edge.
C. Alard
openalex   +7 more sources

The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies [PDF]

Astronomy & Astrophysics, 2009
We present a large sample of fully self-consistent hydrodynamical Nbody/Tree-SPH simulations of isolated dwarf spheroidal galaxies (dSphs). It has enabled us to identify the key physical parameters and mechanisms at the origin of the observed variety in ...
A. Helmi, Alimi, B. Letarte, Babusiaux, Barkana, Barnes, Battaglia, Battaglia, Battaglia, Blais-Ouellette, Bosler, Bullock, Carraro, Coleman, de Blok, de Blok, de Blok, Dekel, Dolphin, E. Tolstoy, Efstathiou, Ferrara, Fukushige, G. Battaglia, Gallagher, Galli, Geisler, Gentile, Gentile, Gilmore, Gingold, Harbeck, Helmi, Hensler, Hernquist, Hernquist, Hurley-Keller, Ikuta, Irwin, K. A. Venn, Katz, Katz, Kawata, Kirby, Kleyna, Kobayashi, Koch, Koch, Kodama, Kroupa, Lanfranchi, Lee, Leitherer, Lucy, M. D. Shetrone, M. Irwin, Mac Low, Maio, Maraston, Maraston, Marcolini, Marcolini, Martin, Mateo, Mayer, Mighell, Monaghan, Moore, Mori, Mori, Murakami, Muñoz, Navarro, P. Jablonka, Peñarrubia, Poirier, Poirier, Read, Ricotti, Salpeter, Salvadori, Schmidt, Serna, Shetrone, Shetrone, Shetrone, Shetrone, Spano, Spekkens, Springel, Stinson, Stinson, Strigari, Sutherland, Swaters, T. Sawala, Tinsley, Tolstoy, Tolstoy, Tsujimoto, V. Hill, Valcke, Walker, Walker, Walker, Wise, Y. Revaz   +106 more
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Supernova Enrichment of Dwarf Spheroidal Galaxies [PDF]

The Astrophysical Journal, 2003
29 pages, 10 figures, to appear in Astrophysical ...
P. Chris Fragile, Stephen Murray, Peter Anninos, D. N. C. Lin   +3 more
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Implications of Elemental Abundances in Dwarf Spheroidal Galaxies [PDF]

Astronomy & Astrophysics, 2005
Unusual elemental abundance patterns observed for stars belonging to nearby dwarf spheroidal (dSph) galaxies are discussed. Analysis of the [alpha/H] vs.
Alves, Audouze, Bonifacio, Cayrel, Chen, Cohen, Edvardsson, Feltzing, Fryer, Geisler, Gilmore, Grebel, Hanson, Heger, Heger, Hill, Hill, Hirschi, Hirschi, Ikuta, Ishimaru, Korn, Lanfranchi, Law, Maeda, Maeder, Mateo, Matteucci, McWilliam, McWilliam, McWilliam, Meynet, Monaco, Nagataki, Nissen, Penny, Robertson, Shetrone, Shetrone, Shigeyama, Shigeyama, Smith, T. Tsujimoto, Thielemann, Tolstoy, Tolstoy, Travaglio, Tsujimoto, Tsujimoto, Tsujimoto, Umeda, Van Dyk, Venn, Wheeler, Yamada   +54 more
core   +3 more sources