Results 1 to 10 of about 44,865 (311)

Using frequency maps to constrain the distribution function of the Milky Way stellar halo

, 2011
Resolved surveys of the Milky Way's stellar halo can obtain all 6 phase space coordinates of tens of thousands of individual stars, making it possible to compute their 3-dimensional orbits. Spectral analysis of large numbers of halo orbits can be used to
Valluri, Monica
core   +2 more sources

The radial metallicity gradients in the Milky Way thick disk as fossil signatures of a primordial chemical distribution [PDF]

, 2014
In this letter we examine the evolution of the radial metallicity gradient induced by secular processes, in the disk of an $N$-body Milky Way-like galaxy. We assign a [Fe/H] value to each particle of the simulation according to an initial, cosmologically
Curir, A., Diaferio, A., Fiorentin, P. Re, Lattanzi, M. G., Serra, A. L., Spagna, A.   +5 more
core   +2 more sources

The Vertical Displacement of the Milky Way Disk [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractAn oscillating vertical displacement of the Milky Way, with a wavelength of about 8 kpc and and amplitude of about 100 pc (increasing with distance from the Galactic center) is observed towards the Galactic anticenter. These oscillations are thought to be the result of disk perturbations from dwarf satellites of the Milky Way.
Newberg, Heidi Jo, Xu, Yan
openaire   +2 more sources

ACTION-BASED DYNAMICAL MODELING FOR THE MILKY WAY DISK [PDF]

The Astrophysical Journal, 2016
ABSTRACT We present RoadMapping, a full-likelihood dynamical modeling machinery that aims to recover the Milky Way’s (MW) gravitational potential from large samples of stars in the Galactic disk. RoadMapping models the observed positions and velocities of stars with a parameterized, three-integral distribution function (DF) in a ...
Wilma H. Trick, Jo Bovy, Hans-Walter Rix
openaire   +3 more sources

Thin disk kinematics from RAVE and the solar motion [PDF]

, 2012
Aims. We study the Milky Way thin disk with the Radial Velocity Experiment (RAVE) survey. We consider the thin and thick disks as different Galactic components and present a technique to statistically disentangle the two populations.
Bertelli, G., Bienayme, O., Bland-Hawthorn, J., Boeche, C., Chiosi, C., Gibson, B. K., Gilmore, G., Grebel, E. K., Munari, U., Navarro, J. F., Parker, Q., Pasetto, S., Reid, W., Seabroke, G., Silviero, A., Steinmetz, M., Zwitter, T.   +16 more
core   +2 more sources

The Formation of the Milky Way Disk

, 2000
We present theoretical results on the galactic abundance gradients of several chemical species for the Milky Way disk, obtained using an improved version of the two-infall model of Chiappini, Matteucci, & Gratton (1997) that incorporates a more realistic model of the galactic halo and disk.
Chiappini, Cristina, Matteucci, Francesca, Romano, Donatella   +2 more
openaire   +2 more sources

The Three-phase Evolution of the Milky Way

The Astrophysical Journal
We illustrate the formation and evolution of the Milky Way over cosmic time, utilizing a sample of 10 million red giant stars with full chemodynamical information, including metallicities and α -abundances from low-resolution Gaia XP spectra.
Vedant Chandra, Vadim A. Semenov, Hans-Walter Rix, Charlie Conroy, Ana Bonaca, Rohan P. Naidu, René Andrae, Jiadong Li, Lars Hernquist   +8 more
doaj   +1 more source

Rotational Curves of the Milky Way Galaxy and Andromeda Galaxy in Light of Vacuum Polarization around Eicheon

Universe, 2023
Eicheon properties are discussed. It is shown that the eicheon surface allows setting a boundary condition for the vacuum polarization and obtaining a solution describing the dark matter tail in the Milky Way Galaxy. That is, the dark matter in the Milky
Sergey L. Cherkas, Vladimir L. Kalashnikov   +1 more
doaj   +1 more source

Identification of the Microlens in Event MACHO-LMC-20 [PDF]

, 2006
We report on the identification of the lens responsible for microlensing event MACHO-LMC-20. As part of a \textit{Spitzer}/IRAC program conducting mid-infrared follow-up of the MACHO Large Magellanic Cloud microlensing fields, we discovered a significant
Brian M. Patten, Charles Alcock, Giovanni G. Fazio, Kallivayalil N., Lasserre T., Massimo Marengo, Michael W. Werner, Nitya Kallivayalil, Patten B. M., Schuster M. T.   +9 more
core   +2 more sources

Origin of the Milky Way disk of satellites: collision of two disk galaxies [PDF]

TECCIENCIA, 2016
The dwarf satellite galaxies of the Milky Way are structures that are distributed around the galaxy in an anisotropic manner on a structure called VPOS or DoS. This structure does not match the predictions made by the cold dark matter cosmological model. This model predicts a fully isotropic distribution around the Milky Way.
Bohórquez Pacheco, Omar Alfonso, Casas Miranda, Rigoberto A.   +1 more
openaire   +2 more sources