Understanding the Milky Way An age of 11.7 billion years for the inner halo makes a certain amount of sense. The outer halo is thought to be slightly older, after all, and the most ancient galaxy clusters suggest that the Milky Way's building blocks began coming together around 13.5 billio...
Galaxy: haloISM: generalISM: structureX-rays: ISMWe investigate the convective stability of two popular types of model of the gas distribution in the hot Galactic halo. We first consider models in which the halo density and temperature decrease exponentially with height above the disk. These ...
The Milky Way's stellar halo - lumpy or triaxial? 来自 IOP 喜欢 0 阅读量: 31 作者:HJ Newberg,B Yanny 摘要: We present minimum chi-squared fits of power law and Hernquist density profiles to F-turnoff stars in eight 2.5 deg wide stripes of SDSS data: five in the North Galactic Cap ...
Analysis of the chemical properties of Milky Way halo stars out to large Galactocentric radii can provide important insights into the properties of the environment in which the stars that contributed to the build-up of different regions of the Milky Way stellar halo formed. In this work we ...
We use this sample to search for new tidal debris structures in the distant halo and to constrain the recent merger history of the Milky Way. Spectroscopic follow-up will facilitate the study of Milky Way halo kinematics. We acknowledge the financial support of NSF AST-1151462. 展开 ...
The Milky Way's million degree gaseous halo contains a considerable amount ofmass that, depending on its structural properties, can be a significant masscomponent. In order to analyze the structure of the Galactic halo, we useXMM-Newton Reflection Grating Spectrometer archival data and measure OVII...
Astronomers believe that the baryon (stellar) halo of the Milky Way retains a fossil imprint of how it was formed. But a vast literature shows that the struggle to interpret the observations within a consistent framework continues. The evidence indicates that the halo has built up through a pro...
The new distances to individual Milky Way stars from the Gaia mission (Brown et al. 2018) have allowed us to use this technique to derive ages from a thick disk colour-magnitude diagram, and from the enigmatic, two-sequenced colour-magnitude diagram of the kinematically hot local halo (...
BEIJING, July 2 (Xinhua) -- Chinese scientists recently proposed that the current dark matter halo of the Milky Way is "slightly oblate." The study, conducted by researchers from the University of the Chinese Academy of Sciences (UCAS), in collaboration with several domestic and international re...
Blue lines mark the contribution from the Milky Way dark matter halo, red lines – the LMC dark matter halo. Extended Data Fig. 2 95% upper limits on PBHs as constituents of dark matter. a, Dependence of the limits on the Milky Way halo model. The black solid line marks limits for ...