Results 21 to 30 of about 105,508 (303)
Advanced Engineering Materials, EarlyView., 2023 This study aims to explore the feasibility of using a structure inspired by the features of horsetail and human spine as the potential helmet liner, targeting at mitigation of acceleration‐induced injuries. A parametric study is conducted to investigate the effect of individual geometrical variables in the design, indicating its capability to reduce ...
Bing Leng +3 more
wiley +1 more source
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 AMBRE project: The thick thin disk and thin thick disk of the Milky Way [PDF]
Astronomy & Astrophysics, 2017 We analyze 494 main sequence turnoff and subgiant stars from the AMBRE:HARPS survey. These stars have accurate astrometric information from Gaia DR1, providing reliable age estimates with relative uncertainties of ±1 or 2 Gyr and allowing precise orbital determinations. The sample is split based on chemistry into a low-[Mg/Fe] sequence, which are often
Hayden, M. R. +4 more
openaire +4 more sources
The age of the Galaxy's thick disk [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractWe discuss the age of the stellar disks in the solar neighborhood. After reviewing the various methods for age dating, we discuss current estimates of the ages of both the thin- and the thick disks. We present preliminary results for kinematically-selected stars that belong to the thin- as well as the thick disk.
Sofia Feltzing, Thomas Bensby
openaire +3 more sources
Black Hole Accretion with Saturated Magnetic Pressure and Disk Wind
The Astrophysical Journal, 2023 We construct an analytical black hole accretion disk model that incorporates both magnetic pressure and disk wind, which are found to be important from numerical simulations.
Jiahui Huang +3 more
doaj +1 more source
Stability of general relativistic static thick disks: the isotropic Schwarzschild thick disk [PDF]
General Relativity and Gravitation, 2007 17 ...
Maximiliano Ujevic, Patricio S. Letelier
openaire +4 more sources
The Physical Thickness of Stellar Disks to z ∼ 2
The Astrophysical Journal, 2023 In local disk galaxies such as our Milky Way, older stars generally inhabit a thicker disk than their younger counterparts. Two competing models have attempted to explain this result: one in which stars first form in thin disks that gradually thicken ...
Kathleen A. Hamilton-Campos +4 more
doaj +1 more source
High-resolution Chemical Abundances of the Nyx Stream
The Astrophysical Journal, 2023 Nyx is a nearby, prograde, and high-eccentricity stellar stream physically contained in the thick disk, but its origin is unknown. Nyx could be the remnant of a disrupted dwarf galaxy, in which case the associated dark matter substructure could affect ...
Shuyu Wang +7 more
doaj +1 more source
THE MAGNESIUM ABUNDANCE IN THE THIN AND THICK DISK OF THE GALAXY
Odessa Astronomical Publications, 2017 The chemical evolution of the thin and thick disk of our Galaxy was investigated in framework of the opened model with gas inflow. It was supposed that the thin and thick disks separate chemically and spatially and have different evolution timescales ...
T. V. Nykytyuk, T. V. Mishenina
doaj +1 more source
KINEMATICAL AND CHEMICAL VERTICAL STRUCTURE OF THE GALACTIC THICK DISK. I. THICK DISK KINEMATICS, [PDF]
The Astrophysical Journal, 2012 Accepted for publication in ...
C. Moni Bidin +3 more
openaire +5 more sources