Zobrazeno 1 - 10
of 124
pro vyhledávání: '"Martinez Medina L"'
Stellar bars and spiral arms co-exist and co-evolve in most disc galaxies in the local Universe. However, the physical nature of this interaction remains a matter of debate. In this work, we present a set of numerical simulations based on isolated ga
Externí odkaz:
http://arxiv.org/abs/2102.01134
Albeit radial migration must be a ubiquitous process in disc galaxies, its significance in the evolution of stellar discs is not always reflected through global trends. However, there are other key observables, such as the metallicity distribution fu
Externí odkaz:
http://arxiv.org/abs/1701.03790
It is a common assumption that high-altitude open clusters live longer compared with clusters moving close to the Galactic plane. This is because at high altitudes, open clusters are far from the disruptive effects of in-plane substructures, such as
Externí odkaz:
http://arxiv.org/abs/1611.04595
Recent observations show that the Milky Way's metallicity distribution function (MDF) changes its shape as a function of radius. This new evidence of radial migration within the stellar disc sets additional constraints on Galactic models. By performi
Externí odkaz:
http://arxiv.org/abs/1604.01765
Autor:
Fernández-Trincado, J. G., Robin, A. C., Moreno, E., Schiavon, R. P., Peréz, A. E. García, Vieira, K., Cunha, K., Zamora, O., Sneden, C., Souto, Diogo, Carrera, R., Johnson, J. A., Shetrone, M., Zasowski, G., García-Hernández, D. A., Majewski, S. R., Reylé, C., Blanco-Cuaresma, S., Martinez-Medina, L. A., Pérez-Villegas, A., Valenzuela, O., Pichardo, B., Meza, A., Mészáros, Sz., Sobeck, J., Geisler, D., Anders, F., Schultheis, M., Tang, B., Roman-Lopes, A., Mennickent, R. E., Pan, K., Nitschelm, C., Allard, F.
We report on detection, from observations obtained with the APOGEE spectroscopic survey, of a metal-poor ([Fe/H] $= -1.3$ dex) field giant star with an extreme Mg-Al abundance ratio ([Mg/Fe] $= -0.31$ dex; [Al/Fe] $= 1.49$ dex). Such low Mg/Al ratios
Externí odkaz:
http://arxiv.org/abs/1604.01279
We present a dynamical study of the effect of the bar and spiral arms on the simulated orbits of open clusters in the Galaxy. Specifically, this work is devoted to the puzzling presence of high-altitude open clusters in the Galaxy. For this purpose w
Externí odkaz:
http://arxiv.org/abs/1601.02612
We recover spiral and barred spiral patterns in disk galaxy simulations with a Wave Dark Matter (WDM) background (also known as Scalar Field Dark Matter (SFDM), Ultra-Light Axion (ULA) dark matter, and Bose-Einstein Condensate (BEC) dark matter). Her
Externí odkaz:
http://arxiv.org/abs/1505.07154
Recent observations of tidal debris around galaxies have revealed that the structural properties of the spheroidal components of tidally disturbed galaxies are similar to those found in non-interacting early-type galaxies(ETGs), likely due to minor m
Externí odkaz:
http://arxiv.org/abs/1503.00799
Publikováno v:
2015 ApJ 802 109
The first mechanism invoked to explain the existence of the thick disk in the Milky Way Galaxy, were the spiral arms. Up-to-date work summon several other possibilities that together seem to better explain this component of our Galaxy. All these proc
Externí odkaz:
http://arxiv.org/abs/1501.07649
Publikováno v:
Phys. Rev. D 91, 023519 (2015)
We analyse the velocity dispersion for eight of the Milky Way dwarf spheroidal satellites in the context of finite temperature scalar field dark mater. In this model the finite temperature allows the scalar field to be in configurations that possess
Externí odkaz:
http://arxiv.org/abs/1410.4163