Results 41 to 50 of about 34,432 (305)

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   +1 more source

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
core   +2 more sources

The Origin Of Dwarf Spheroidal Galaxies [PDF]

Symposium - 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   +1 more source

Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy [PDF]

, 2017
We present Iron, Magnesium, Calcium, and Titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9.0 arcmin ~70 pc from the center) from medium-resolution Keck/DEIMOS spectra.
A. Mucciarelli, M. Bellazzini, R. Ibata, D. Romano, S. Chapman, Lorenzo Monaco   +5 more
semanticscholar   +1 more source

Kinematic subpopulations in dwarf spheroidal galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
Submitted to ...
Ural, Uğur, Wilkinson, Mark I., Koch, Andreas, Gilmore, Gerard, Beers, Timothy C., Belokurov, V., Wyn Evans, N., Grebel, E.K., Vidrih, Simon, Zucker, D. B.   +9 more
openaire   +3 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

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

, 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, A. Archer, W. Benbow, R. Bird, E. Bourbeau, T. Brantseg, M. Buchovecky, J. Buckley, V. Bugaev, K. Byrum, M. Cerruti, J. Christiansen, M. Connolly, W. Cui, M. Daniel, Q. Feng, J. Finley, H. Fleischhack, L. Fortson, A. Furniss, A. Geringer-Sameth, S. Griffin, J. Grube, M. Hutten, N. Haakansson, D. Hanna, O. Hervet, J. Holder, G. Hughes, C. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, S. Koushiappas, M. Krause, S. Kumar, M. Lang, T. T. Lin, S. McArthur, P. Moriarty, D. Nieto, S. O’Brien, R. Ong, A. Otte, N. Park, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, P. Reynolds, G. Richards, E. Roache, C. Rulten, I. Sadeh, M. Santander, G. Sembroski, K. Shahinyan, A. Smith, D. Staszak, I. Telezhinsky, S. Tr'epanier, J. Tucci, J. Tyler, S. Wakely, A. Weinstein, P. Wilcox, D. Williams, B. Department, M. University, Montreal, D. Physics, W. University, S. Louis, Mó, Fred Lawrence Whipple Observatory, H. C. F. Astrophysics, Amado, Az, Astronomy, U. California, L. Angeles, Ca, I. S. University, Ames, Ia, A. N. Laboratory, Argonne, Il, P. Department, California Polytechnic State University, S. Obispo, S. O. Physics, National University of Ireland Galway, University Road, Galway., Ireland, P. University, W. Lafayette, In, Center for Computational Astrophysics, Tsinghua University, Beijing, Desy, Zeuthen, H Germany, U. Minnesota, Minneapolis, Mn, California Bay, Hayward, Brown University, Providence, Ri, Stevens Institute of Technology, Hoboken, Nj, I. O. Physics, U. Potsdam, Santa Cruz Institute for Particle Physics, Santa Cruz, T. B. R. Institute, U. Delaware, Newark, De, U. Iowa, Van Allen Hall, Iowa City, U. Utah, Salt lake City, Ut, D. University, Greencastle, Columbia University, New York., Ny, University College Dublin, Center for Computational Astrophysics, G. I. O. Technology, Atlanta, Ga, Enrico Fermi Institute, U. Chicago, Chicago., D. Sciences, C. I. O. Technology, Cork, Barnard College, U. Maryland, College Park Nasa Gsfc, College Park, Md   +153 more
semanticscholar   +1 more source

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 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.
Grebel, Eva K., Gallagher, John S., Harbeck, Daniel   +2 more
openaire   +2 more sources

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

, 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, J. Simon, A. Frebel, I. Thompson, S. Shectman, M. Mateo, J. Bailey, J. Crane, M. Walker   +8 more
semanticscholar   +1 more source