Vertical Density Distribution of the Galaxy from Star Count Analysis [PDF]
Journal of Astronomy and Space Sciences, 2002 The five space density distribution D(z) with distance perpendicular to the Galactic plane were combined. The scale heights and the local densities at z = 0 of the thin disk, thick disk, and the halo components were estimated from the nonlinear least ...
Young-Jong Sohn
doaj +1 more source
The shape of the Galactic halo withGaiaDR2 RR Lyrae. Anatomy of an ancient major merger [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We use the $Gaia$ DR2 RR Lyrae sample to gain an uninterrupted view of the Galactic stellar halo. We dissect the available volume in slices parallel to the Milky Way's disc to show that within $\sim30$ kpc from the Galactic centre the halo is triaxial ...
G. Iorio, V. Belokurov
semanticscholar +1 more source
Disentangling the Galactic Halo with APOGEE. I. Chemical and Kinematical Investigation of Distinct Metal-poor Populations [PDF]
, 2017 We find two chemically distinct populations separated relatively cleanly in the [Fe/H]–[Mg/Fe] plane, but also distinguished in other chemical planes, among metal-poor stars (primarily with metallicities ) observed by the Apache Point Observatory ...
C. Hayes +23 more
semanticscholar +1 more source
Origin of the Cosmic Ray Galactic Halo Driven by Advected Turbulence and Self-Generated Waves. [PDF]
Physical Review Letters, 2018 The diffusive paradigm for the transport of Galactic cosmic rays is central to our understanding of the origin of these high energy particles. However, it is worth recalling that the normalization, energy dependence, and spatial extent of the diffusion ...
Carmelo Evoli +3 more
semanticscholar +1 more source
Galactic Archeology with the AEGIS Survey: The Evolution of Carbon and Iron in the Galactic Halo [PDF]
Astrophysical Journal, 2018 Understanding the evolution of carbon and iron in the Milky Way’s halo is of importance because these two elements play crucial roles in constraining star formation, Galactic assembly, and chemical evolution in the early universe.
Jinmi Yoon +8 more
semanticscholar +1 more source
A search for dark matter in the Galactic halo with HAWC [PDF]
, 2017 The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field-of-view observatory sensitive to 500 GeV – 100 TeV gamma rays and cosmic rays. With its observations over 2/3 of the sky every day, the HAWC observatory is sensitive to a wide
A. Abeysekara +103 more
semanticscholar +1 more source
The Profile of the Galactic Halo from Pan-STARRS1 3π RR Lyrae [PDF]
, 2018 We characterize the spatial density of the Pan-STARRS1 (PS1) sample of Rrab stars to study the properties of the old Galactic stellar halo. This sample, containing 44,403 sources, spans galactocentric radii of 0.55 kpc ≤ Rgc ≤ 141 kpc with a distance ...
N. Hernitschek +13 more
semanticscholar +1 more source
A simple multistage closed-(box+reservoir) model of chemical evolution [PDF]
Serbian Astronomical Journal, 2011 Simple closed-box (CB) models of chemical evolution are extended on two respects, namely (i) simple closed-(box+reservoir) (CBR) models allowing gas outflow from the box into the reservoir (Hartwick 1976) or gas inflow into the box from the ...
Caimmi R.
doaj +1 more source
Vacuum Polarization Instead of “Dark Matter” in a Galaxy
Universe, 2022 We considered a vacuum polarization inside a galaxy in the eikonal approximation and found that two possible types of polarization exist. The first type is described by the equation of state p=ρ/3, similar to radiation.
Sergey L. Cherkas +1 more
doaj +1 more source
The Disk-Halo Distinction of Galaxies Using Faraday Tomography
Galaxies, 2018 Faraday tomography allows us to study the distribution and properties of the magnetoionic medium of galaxies through the Faraday effect. However, this can be achieved only after the Faraday spectrum is interpreted.
Shinsuke Ideguchi
doaj +1 more source