Results 121 to 130 of about 212,400 (210)

Kinematically Cold Populations at Large Radii in the Draco and Ursa Minor Dwarf Spheroidal Galaxies

, 2004
We present projected velocity dispersion profiles for the Draco and Ursa Minor (UMi) dwarf spheroidal galaxies based on 207 and 162 discrete stellar velocities, respectively.
M. J. Irwin (7589990), J. T. Kleyna (7589984), G. F. Gilmore (7589987), E. K. Grebel (7589993), M. I. Wilkinson (7589981), N. W. Evans (6908912)   +5 more
core   +4 more sources

Disentangling γ − β: The Fourth-order Velocity Moments Based on Spherical Jeans Analysis

The Astrophysical Journal
Distinguishing a core and a cusp within dark matter halos is complexified by the existence of mass-anisotropy degeneracy, where various combinations of velocity anisotropy ( β ) and inner density slope ( γ ) yield similar observational signatures.
Dafa Wardana, Masashi Chiba, Kohei Hayashi   +2 more
doaj   +1 more source

The Proper Motion of Draco II with HST Using Multiple Reference Frames and Methodologies

The Astrophysical Journal
We present proper motion (PM) measurements for Draco II, an ultrafaint dwarf satellite of the Milky Way. These PMs are measured using two epochs of Hubble Space Telescope (HST)/Advanced Camera for Surveys imaging separated by a 7 yr temporal baseline ...
Jack T. Warfield, Kevin A. McKinnon, Sangmo Tony Sohn, Nitya Kallivayalil, Alessandro Savino, Roeland P. van der Marel, Andrew B. Pace, Christopher T. Garling, Niusha Ahvazi, Paul Bennet, Roger E. Cohen, Matteo Correnti, Mark A. Fardal, Kristen. B. W. McQuinn, Max J. B. Newman, Eduardo Vitral   +15 more
doaj   +1 more source

Tracing satellite planes in the Sculptor group

Astronomy & Astrophysics
Context. Although substantial progress has been made in reconciling lambda cold dark matter (ΛCDM) simulations with the observed abundance and distribution of satellite galaxies, important tensions persist.
Martínez-Delgado David, Stein Michael, Pawlowski Marcel S., Sakowska Joanna D., Makarov Dmitry, Makarova Lidia, Donatiello Giuseppe, Lang Dustin   +7 more
doaj   +1 more source

Are Local Group Dwarf Spheroidal Galaxies the First Safe Planet-hosting Environments?

The Astrophysical Journal
We explore whether Local Group dwarf spheroidal (dSph) galaxies might have hosted Earth-like planets dwelling unexposed for several billions of years to major galactic threats to life, such as supernovae and gamma-ray bursts.
Stefano Ciabattini, Stefania Salvadori, Leonardo Testi   +2 more
doaj   +1 more source

The distance to the Fornax Dwarf Spheroidal Galaxy

, 2007
Accepted for publication on Monthly Notices of the Royal Astronomical ...
Rizzi, L., Held, E. V., Saviane, I., Tully, R. B., Gullieuszik, M.   +4 more
openaire   +2 more sources

Search for HI in Dwarf Spheroidal Galaxies

, 1999
After reviewing the HI content and distribution in extreme dwarf irregular (dIrr) and dwarf elliptical (dE) galaxies, previous searches for HI in dwarf spheroidal (dSph) galaxies will be discussed.
Claude Carignan
core   +1 more source

The Dark Matter Content of Milky Way Dwarf Spheroidal Galaxies: Draco, Sextans, and Ursa Minor

The Astrophysical Journal
The Milky Way Survey of the Dark Energy Spectroscopic Instrument (DESI) has so far observed three classical dwarf spheroidal galaxies (dSphs): Draco, Sextans, and Ursa Minor.
Hao Yang, Wenting Wang, Ling Zhu, Ting S. Li, Sergey E. Koposov, Jiaxin Han, Songting Li, Rui Shi, Monica Valluri, Alexander H. Riley, Arjun Dey, Constance Rockosi, Carles G. Palau, Jessica Nicole Aguilar, Steven Ahlen, David Brooks, Todd Claybaugh, Andrew Cooper, Axel de la Macorra, Peter Doel, Simone Ferraro, Jaime E. Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Alma Xochitl Gonzalez Morales, Gaston Gutierrez, Julien Guy, Klaus Honscheid, Mustapha Ishak, Dick Joyce, Robert Kehoe, Theodore Kisner, Namitha Kizhuprakkat, Anthony Kremin, Ofer Lahav, Martin Landriau, Laurent Le Guillou, Gustavo E. Medina, Aaron Meisner, Ramon Miquel, Nathalie Palanque-Delabrouille, Francisco Prada, Ignasi Pérez-Ràfols, Graziano Rossi, Eusebio Sanchez, David Schlegel, Michael Schubnell, Joseph Harry Silber, David Sprayberry, Gregory Tarlé, Benjamin Alan Weaver, Rongpu Zhou, Hu Zou   +52 more
doaj   +1 more source

Resonant stripping as the origin of dwarf spheroidal galaxies

, 2019
Dwarf spheroidal galaxies are the most dark-matter-dominated systems in the nearby Universe(1-3) and their origin is one of the outstanding puzzles of how galaxies form.
Besla, Gurtina, Hernquist, Lars, Cox, Thomas J., D'Onghia, Elena   +3 more
core   +1 more source

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VIII. A Census of Long-period Variable Stars across the Andromeda Dwarf Satellite System

The Astrophysical Journal
We present a comprehensive catalog, in the Sloan i and Harris V filters, of long-period variable (LPV) stars in the spheroidal dwarf satellites of the Andromeda galaxy based on a dedicated survey for variable stars in Local Group dwarf systems.
Hedieh Abdollahi, Atefeh Javadi, Jacco Th. van Loon, Iain McDonald, Mahdi Abdollahi, Elham Saremi, Habib G. Khosroshahi, László Molnár, Hamidreza Mahani   +8 more
doaj   +1 more source