Results 71 to 80 of about 11,545 (216)

Two chemically similar stellar overdensities on opposite sides of the plane of the Galaxy [PDF]

, 2018
Our Galaxy is thought to have undergone an active evolutionary history dominated by star formation, the accretion of cold gas, and, in particular, mergers up to 10 gigayear ago.
A Helmi, A Helmi, A Kunder, A Mucciarelli, A Smette, AA Sheffield, Adrian M. Price-Whelan, Aldo M. Serenelli, Allyson Sheffield, AM Amarsi, AM Price-Whelan, AM Serenelli, Andrew Gould, B Gustafsson, B Lemasle, B Letarte, Branimir Sesar, CE Dorman, Chervin F. P. Laporte, CW Purcell, D Yong, E Stonkute, E Tolstoy, EF Bell, EN Kirby, FA Gómez, GR Ruchti, HJ Rocha-Pinto, J Bovy, JA Valenti, JE Lawler, JG Cohen, JS Bullock, Judith G. Cohen, K Freeman, K Lind, K Lind, Kathryn V. Johnston, KV Johnston, L Casagrande, L Casagrande, L Magrini, L Sbordone, Luca Casagrande, M Asplund, M Bergemann, M Bergemann, M Bergemann, M Odenkirchen, M Shetrone, M Van Hove, Maria Bergemann, MW Feast, NF Martin, P Villemoes, P Villemoes, PE Nissen, PF Weck, PJ Storey, R Gratton, R Schönrich, Ralph Schönrich, RE Silverans, S Kazantzidis, S Sharma, SA Korotin, SS Vogt, SV Ramírez, T Bensby, Ting S. Li, TS Li, V Kovtyukh, W Freudling, XX Xue, Y Xu   +74 more
core   +3 more sources

Updated Bounds on Axion‐Like Particle Dark Matter with the Optical MUSE‐Faint Survey

Annalen der Physik, Volume 536, Issue 1, January 2024.
This study presents bounds on the axion‐like particle (ALP) to two‐photon coupling in the mass range $2.65‐5.27$ eV. The signal from ALP decay are sought in the Multi Unit Spectroscopic Explorer (MUSE) observations of five dwarf spheroidal galaxies, under the assumption that ALPs make up the whole dark matter.
Elisa Todarello
wiley   +1 more source

Pulsar‐Driven Jets in Supernovae, Gamma‐Ray Bursts, and the Universe

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
The bipolarity of Supernova 1987A can be understood through its very early light curve from the CTIO 0.4 m telescope and IUE FES and following speckle observations of the “Mystery Spot”. These indicate a beam/jet of light/particles, with initial collimation factors >104 and velocities >0.95 c, involving up to 10−5 M⊙ interacting with circumstellar ...
John Middleditch, Alberto J. Castro-Tirado   +1 more
wiley   +1 more source

Lambda-Cold Dark Matter, Stellar Feedback, and the Galactic Halo Abundance Pattern [PDF]

, 2005
(Abridged) The hierarchical formation scenario for the stellar halo requires the accretion and disruption of dwarf galaxies, yet low-metallicity halo stars are enriched in alpha-elements compared to similar, low-metallicity stars in dwarf spheroidal ...
Andreea S. Font, Bondi H., Brant Robertson, Devriendt J. E. G., Gratton R. G., Gratton R. G., Gratton R. G., Greggio L., Hill V., Hill V., Hill V., Hill V., James S. Bullock, Jasniewicz G., Kathryn V. Johnston, Lacey C., Lars Hernquist, Matteucci F., Matteucci F., Matteucci F., Moore B., Nissen P. E., Pagel B. E. J., Schaller G., Tinsley B. M., Tinsley B. M., Tsujimoto T., Unavane M.   +27 more
core   +2 more sources

Implications and Applications of Kinematic Galaxy Scaling Relations

International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012
Galaxy scaling relations, which describe a connection between ostensibly unrelated physical characteristics, testify to an underlying order in galaxy formation that requires understanding. I review the development of a scaling relation that (1) unites the well‐known fundamental plane (FP) relation of giant elliptical galaxies and Tully‐Fisher (TF ...
Dennis Zaritsky, J. A. L. Aguerri, P. Salucci   +2 more
wiley   +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

Zinc abundances in the Sculptor dwarf spheroidal galaxy^, [PDF]

Astronomy & Astrophysics, 2017
From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have been made in ≈100 individual red giant branch (RGB) stars in the Sculptor dwarf spheroidal galaxy. This is the largest sample of individual Zn abundance measurements within a stellar system beyond the Milky Way.
Skuladottir, A., Tolstoy, E., SALVADORI, STEFANIA, Hill, V., Pettini, M.   +4 more
openaire   +3 more sources

Abundance ratios of red giants in low mass ultra faint dwarf spheroidal galaxies [PDF]

, 2015
Low mass dwarf spheroidal galaxies are key objects for our understanding of the chemical evolution of the pristine Universe and the Local Group of galaxies.
Bidin, C. Moni, Bonifacio, P., François, P., Geisler, D., Monaco, L., Sbordone, L.   +5 more
core   +4 more sources

CORES IN DARK MATTER HALOES WITH ANISOTROPIC OSIPKOV-MERRITT DISTRIBUTION AND MAXIMAL PHASE-SPACE DENSITY

Odessa Astronomical Publications, 2017
This paper describes the developed model of dark matter cored density profiles. This model was recently proposed by Dmytro Iakubovskyi (Iakubovskyi & Rudakovskyi, in preparation).
A. V. Rudakovskyi
doaj   +1 more source

Origin of structural and kinematical properties of the Small Magellanic Cloud

, 2009
We investigate structural, kinematical, and chemical properties of stars and gas in the Small Magellanic Cloud (SMC) interacting with the Large Magellanic Cloud (LMC) and the Galaxy based on a series of self-consistent chemodynamical simulations.
Bekki, Binney, Broeils, Brüns, Cioni, Hatzidimitriou, Idiart, Kato, Kenji Bekki, Masashi Chiba, Monaghan, Murai, Noguchi, Spite   +13 more
core   +1 more source