Results 121 to 130 of about 1,735 (217)

The Binary Fraction of Stars in the Dwarf Galaxy Ursa Minor via Dark Energy Spectroscopic Instrument

The Astrophysical Journal
We utilize multiepoch line-of-sight velocity measurements from the Milky Way Survey of the Dark Energy Spectroscopic Instrument to estimate the binary fraction for member stars in the dwarf spheroidal galaxy Ursa Minor (UMi).
Tian Qiu, Wenting Wang, Sergey E. Koposov, Ting S. Li, Nathan R. Sandford, Joan Najita, Songting Li, Jiaxin Han, Arjun Dey, Constance Rockosi, Boris Gaensicke, Jesse Han, Benjamin Alan Weaver, Adam D. Myers, Jessica Nicole Aguilar, Steven Ahlen, Carlos Allende Prieto, Davide Bianchi, David Brooks, Todd Claybaugh, Axel de la Macorra, Peter Doel, Andreu Font-Ribera, Jaime E. Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Gaston Gutierrez, Jorge Jimenez, Dick Joyce, Theodore Kisner, Claire Lamman, Martin Landriau, Laurent Le Guillou, Aaron Meisner, Ramon Miquel, Seshadri Nadathur, Will Percival, Claire Poppett, Francisco Prada, Ignasi Pérez-Ràfols, Graziano Rossi, Eusebio Sanchez, David Schlegel, Joseph Harry Silber, David Sprayberry, Gregory Tarlé, Rongpu Zhou, Hu Zou   +47 more
doaj   +1 more source

The Apache Point Observatory Extra-galactic Evolution Experiment (APOeGEE): Chemical Abundance Trends for Seven Dwarf Spheroidal Galaxies in the APOGEE Survey

The Astrophysical Journal
In addition to comprehensive surveys of the Milky Way (MW) bulge, disk, and halo, the Apache Point Galactic Evolution Experiment (APOGEE) project observed seven dwarf spheroidal satellites (dSphs) of the MW: Carina, Sextans, Sculptor, Draco, Ursa Minor ...
Matthew Shetrone, Rachael L. Beaton, Christian R. Hayes, Sten Hasselquist, Joshua D. Simon, Jon A. Holtzman, Katia Cunha, Steven R. Majewski, Jennifer Sobeck, Ricardo Schiavon, Thomas Masseron, Verne V. Smith, David L. Nidever   +12 more
doaj   +1 more source

WFPC2 Observations of the Carina Dwarf Spheroidal Galaxy.

The Astronomical Journal, 1997
We present our analysis of Hubble Space Telescope Wide Field Planetary Camera 2 observations in F555W (~V) and F814W (~I) of the Carina dwarf spheroidal galaxy. The resulting V vs (V-I) color-magnitude diagrams reach V ~ 27.1 mag. The reddening of Carina is estimated to be E(V-I) = 0.08 +- 0.02 mag.
openaire   +2 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

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

Chemical Evolution of Mn in Three Dwarf Spheroidal Galaxies [PDF]

, 2014
Based on an improved model, more reasonable nucleosynthesis and explosion rate of SNeIa and CCSNe, we studied Mn evolution for three local dwarf spheroidal galaxies (dSphs), considering the detailed SNe yield and explosion rates for different types of ...
Zhang, Jie, Liu, Men-Quan
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