Results 91 to 100 of about 11,545 (216)

Kinematics and Metallicity of the Dwarf Spheroidal Galaxy Andromeda XVIII

The Astrophysical Journal
Andromeda XVIII is an isolated dwarf galaxy 579 kpc away from the nearest large galaxy, M31. It is a candidate “backsplash galaxy” that might have been affected by a close passage to M31.
Kateryna A. Kvasova, Evan N. Kirby, Rachael L. Beaton   +2 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

A Revised Parallel-Sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies [PDF]

, 2011
We update van den Bergh's parallel sequence galaxy classification in which S0 galaxies form a sequence S0a-S0b-S0c that parallels the sequence Sa-Sb-Sc of spiral galaxies.
Abramson, Arnaboldi, Arnaboldi, Arnaboldi, Arnaboldi, Arnaboldi, Baggett, Baldry, Bell, Bender, Bender, Bender, Bender, Bender, Bender, Bender, Bernardi, Binggeli, Binggeli, Binggeli, Blanton, Blanton, Boselli, Bullock, Buta, Buta, Buta, Buta, Buta, Böker, Böker, Chen, Chiboukas, Chung, Chung, Combes, Courteau, Côté, Da Costa, Davé, De Rijcke, de Souza, de Vaucouleurs, Djorgovski, Dressler, Faber, Ferguson, Ferrarese, Fisher, Freeland, Gavazzi, Geha, Geha, Geisler, Glass, Gonzalez, Graham, Graham, Graham, Grebel, Hamabe, Hinz, Hogg, Hogg, Hopkins, Hopkins, Hopkins, Hubble, Hurley-Keller, Ibata, Ibata, Ibata, Irwin, Jerjen, Jerjen, Jerjen, John Kormendy, Jørgensen, Karachentsev, Kazantzidis, Kelson, Kenney, Kenney, Kenney, Kirby, Komatsu, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Kormendy, Krajnović, Krick, Lake, Larson, Laurikainen, Laurikainen, Li, Lisker, Lisker, Martin, Mateo, Mayer, Mayer, Mei, Merritt, Mihos, Mihos, Mihos, Milosavljević, Moore, Moore, Morgan, Mori, Naab, Neistein, Okamura, Oser, Oser, Peng, Pildis, Press, Ralf Bender, Robertson, Saglia, Saito, Sandage, Sandage, Sandage, Sandage, Sandage, Scorza, Sellwood, Shetrone, Shetrone, Shetrone, Shetrone, Simard, Strateva, Sérsic, Temi, Tolstoy, Tonnesen, Tonnesen, Tonnesen, Tonnesen, Tremaine, Tully, van Albada, van den Bergh, van den Bergh, van den Bergh, van den Bergh, van Dokkum, van Driel, van Gorkom, van Woerden, van Zee, Veilleux, Venn, Venn, Vikhlinin, Watt, Weinzirl, Weisz, Weisz, Welch, Williams, Williams, Wilman, Yoshida   +182 more
core   +3 more sources

Gravitational tides and dwarf spheroidal galaxies [PDF]

Astronomy & Astrophysics, 2014
The effect of the local environment on the evolution of dwarf spheroidal galaxies is poorly understood. We have undertaken a suite of simulations to investigate the tidal impact of the Milky Way on the chemodynamical evolution of dwarf spheroidals that resemble present day classical dwarfs using the SPH code GEAR.
Nichols, Matthew, Revaz, Yves, Jablonka, Pascale   +2 more
openaire   +4 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

Maximally self-interacting dark matter: models and predictions

Journal of High Energy Physics, 2020
We study self-interacting dark matter (SIDM) scenarios, where the s-wave self-scattering cross section almost saturates the Unitarity bound. Such self-scattering cross sections are singly parameterized by the dark matter mass, and are featured by strong ...
Ayuki Kamada, Hee Jung Kim, Takumi Kuwahara   +2 more
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

Stellar 3-D kinematics in the Draco dwarf spheroidal galaxy [PDF]

, 2019
Aims. We present the first three-dimensional internal motions for individual stars in the Draco dwarf spheroidal galaxy. Methods. By combining first-epoch $Hubble$ $Space$ $Telescope$ observations and second-epoch $Gaia$ Data Release 2 positions, we ...
Helmi, Amina, Massari, Davide, Mucciarelli, Alessio, Sales, Laura V., Spina, Lorenzo, Tolstoy, Eline   +5 more
core   +3 more sources

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

Revisiting candidate high-velocity stars associated with the Sagittarius dwarf spheroidal galaxy

Astronomy & Astrophysics
Context. Hypervelocity stars (HVSs) are valuable tracers of extreme dynamical processes. The Sagittarius dwarf spheroidal galaxy (Sgr dSph), currently undergoing tidal disruption, offers a unique environment to search for such stars. Aims.
Zhang Jian, Du Cuihua, Deng Mingji, Liu Haoyang, Li Zhongcheng   +4 more
doaj   +1 more source