Results 101 to 110 of about 11,917 (213)

Impulsive Mixing of Stellar Populations in Dwarf Spheroidal Galaxies

The Astrophysical Journal
We study the response of mono-energetic stellar populations with initially isotropic kinematics to impulsive and adiabatic changes to an underlying dark matter potential.
Raphaël Errani, Matthew G. Walker, Simon Rozier, Jorge Peñarrubia, Julio F. Navarro   +4 more
doaj   +1 more source

Searches for HI in the Outer Parts of Four Dwarf Spheroidal Galaxies

, 1999
Previous searches for atomic gas in our Galaxy's dwarf spheroidal companions have not been complete enough to settle the question of whether or not these galaxies have HI, especially in their outer parts.
Young, L. M.
core   +2 more sources

Machine Learning Techniques to Distinguish Giant Stars from Dwarf Stars Using Only Photometry—Pushing Redward

The Astronomical Journal
We present our photometric method, which combines Subaru/Hyper Suprime-Cam N B 515, g -band, and i- band filters to distinguish giant stars in Local Group galaxies from Milky Way dwarf contamination.
Keyi Ding, Carrie Filion, Rosemary F.G. Wyse, Evan N. Kirby, Itsuki Ogami, Masashi Chiba, Yutaka Komiyama, László Dobos, Alexander S. Szalay   +8 more
doaj   +1 more source

An Analytical Galactic Chemical Evolution Model with Gas Inflow and a Terminal Wind

The Astrophysical Journal
We present a new analytical galactic chemical evolution (GCE) model with gas inflow, internally caused outflow, and extra gas loss after a period of time. The latter mimics the ram pressure stripping of a dwarf satellite galaxy near the pericenter of its
Kateryna A. Kvasova, Evan N. Kirby
doaj   +1 more source

Keck Studies of M31's Stellar Halo

, 2000
We present Keck 10-meter/LRIS spectra of candidate red giants in the halo of M31, located at a projected radius of R=19kpc on the minor axis. These spectroscopic targets have been selected using a combination of UBRI-based and morphological screening to ...
Grebel, Eva K., Guhathakurta, Puragra, Reitzel, David B.   +2 more
core   +2 more sources

The Kinematics of Dwarf Spheroidal Galaxies

, 1997
I review observational data on the kinematic properties of dwarf spheroidal galaxies in the halo of the Milky Way and beyond. The present data confirm previous claims that these galaxies have unusually large central velocity dispersions. `Simple' sources of bias such as binary stars, internal atmospheric motions, measurement errors, and small sample ...
openaire   +2 more sources

A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy

, 2013
Dwarf satellite galaxies are thought to be the remnants of the population of primordial structures that coalesced to form giant galaxies like the Milky Way.
A Klypin, A Koch, A. Dougal Mackey, A. R. Conn, Alan W. McConnachie, Annette M. N. Ferguson, Anthony R. Conn, AR Conn, AR Zentner, AW McConnachie, AW McConnachie, AW McConnachie, D Lynden-Bell, D Lynden-Bell, David Valls-Gabaud, DG Barnes, E Komatsu, EJ Tollerud, Geraint F. Lewis, J Wang, JC Richardson, Julio Navarro, Lawrence M. Widrow, M Metz, M Metz, M Metz, Mark Fardal, MG Lee, Michael J. Irwin, Michelle L. Collins, MLM Collins, MR Lovell, MS Pawlowski, Neil G. Ibata, Nicolas F. Martin, R. Michael Rich, Rodrigo A. Ibata, RP van der Marel, Scott C. Chapman, SR Majewski   +39 more
core   +3 more sources

Holmberg IX: A Unique, Infant but Inactive Galaxy as Revealed via a Multiwavelength Approach

The Astrophysical Journal Letters
In this Letter, we report a novel discovery of unique characteristics for the tidal dwarf galaxy (candidate) Holmberg IX via a multiwavelength investigation.
Ye-Wei Mao, Luis C. Ho, Alexei V. Moiseev, Oleg V. Egorov, Andrej M. Sobolev   +4 more
doaj   +1 more source

A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules

, 2009
Our aim is to provide as clean and as complete a sample as possible of red giant branch stars that are members of the Hercules dSph galaxy. With this sample we explore the velocity dispersion and the metallicity of the system.
A. Koch, Anthony-Twarog, Battaglia, Belokurov, Belokurov, Belokurov, Belokurov, Bertin, Bonanos, Bond, Calamida, Carretta, Carretta, Clem, Cole, Coleman, D. Adén, D. B. Zucker, D. Faria, E. K. Grebel, Faria, G. F. Gilmore, Gallagher, Gilbert, Gilmore, Grebel, Helmi, Hilker, Howell, I. Lundström, Irwin, Jordi, Keller, Kirby, Kirby, Kleyna, Kniazev, Koch, Koch, Koch, Koch, Koch, Koch, Lanfranchi, Lind, M. I. Wilkinson, Marigo, Martin, N. W. Evans, Olsen, Olsen, Olsen, Olsen, Olsen, Olsen, Olszewski, Pasquini, Richtler, Robin, Rutledge, Rutledge, S. Feltzing, Schiavon, Schlegel, Schuster, Schuster, Shetrone, Siegel, Simon, Strigari, Tonry, Ural, V. Belokurov, VandenBerg, Walker, Walker, Walsh, Walsh, Zinn, Zucker, Zucker   +80 more
core   +1 more source

Dark Matter Searches with HAWC

, 2017
The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field-of-view observatory sensitive to 0.5 TeV - 100 TeV gamma-rays and cosmic-rays in the State of Puebla, Mexico at an altitude of 4100m.
Smith, Andrew J., Yapici, Tolga
core   +1 more source