Results 21 to 30 of about 547,861 (372)
Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022 Abstract Purpose To assess whether the joint application of hybrid iterative reconstruction (HIR) and an adaptive filter (AF) could reduce streak artifacts and improve image quality of neck‐and‐shoulder computed tomography (CT). Methods This study included 96 patients with suspicious neck lesions who underwent a routine nonenhanced scan on a 64‐slice ...
Wenfeng Jin +6 more
wiley +1 more source
Calculation of Velocity Dispersion of the Nearby Galaxies Using Different Stellar Template Libraries [PDF]
Serbian Astronomical Journal, 2010 We present the central velocity dispersion measurements of the nearby galaxies from the Sloan Digital Sky Survey (SDSS). Using the sample from the paper by Ho et al. 2009, we have selected 23 galaxies for which we calculate the velocity dispersion.
Lalovic, A.
doaj +3 more sources
Velocity Dispersions in Clusters of Galaxies [PDF]
Highlights of Astronomy, 1977 31 redshifts have been obtained for A1367, 34 for A262 and 61 for the Centaurus cluster (HMS 1247-4102). Full details of this work have been and will be presented in M.N.R.A.S. Both A1367 and A262 are spiral-rich in Oemler’s classification, while Centaurus is intermediate in type between spiral-rich and poor.
J. A. Dawe +3 more
openaire +2 more sources
地球与行星物理论评, 2023 Surface wave tomography using dispersion data to obtain isotropic and anisotropic shear wave velocity structures is a very efficient approach to study regional and global tectonics and deformation and to probe high-resolution crustal, upper mantle and ...
Huajian Yao +4 more
doaj +1 more source
Velocity dispersion around ellipticals in MOND [PDF]
Astronomy & Astrophysics, 2007 We investigate how different models that have been proposed for solving the dark matter problem can fit the velocity dispersion observed around elliptical galaxies, on either a small scale (~ 20kpc) with stellar tracers, such as planetary nebulae, or large scale (~ 200kpc) with satellite galaxies as tracers.
Tiret, Olivier +4 more
openaire +6 more sources
Imprints of zero-age velocity dispersions and dynamical heating on the age–velocity dispersion relation [PDF]
Publications of the Astronomical Society of Japan, 2017 Abstract Observations of stars in the the solar vicinity show a clear tendency of old stars to have larger velocity dispersions. This relation is called the age–velocity dispersion relation (AVR) and it is believed to provide insight into the heating history of the Milky Way galaxy. Here, in order to investigate the origin of the AVR, we
Takayuki R. Saitoh +4 more
openaire +3 more sources
Velocity dispersions in galaxy clusters
The Astrophysical Journal, 1993 We analyze the velocity dispersions of 79 galaxy clusters having at least 30 galaxies with available redshifts. We show that different estimates of velocity dispersion give similar results on cluster samples of at least 20 galaxies each. However, only robust estimates of velocity dispersion seem to be efficient on cluster samples with 10 galaxies each.
GIRARDI, MARISA +4 more
openaire +4 more sources
Dynamical evolution of star forming regions - II. Basic kinematics [PDF]
, 2016 We follow the dynamical evolution of young star-forming regions with a wide range of initial conditions and examine how the radial velocity dispersion, $\sigma$, evolves over time.
Parker, Richard J., Wright, Nicholas J.
core +2 more sources
Stellar velocity dispersion in NLS1 galaxies [PDF]
Proceedings of the International Astronomical Union, 2004 5 pages, 4 figures, accepted for publication in ...
BOTTE, VIRGINIA +4 more
openaire +5 more sources
Velocity Segregation and Systematic Biases In Velocity Dispersion Estimates With the SPT-GMOS Spectroscopic Survey [PDF]
, 2017 The velocity distribution of galaxies in clusters is not universal; rather, galaxies are segregated according to their spectral type and relative luminosity. We examine the velocity distributions of different populations of galaxies within 89 Sunyaev Zel'
Bayliss, Matthew. B. +17 more
core +2 more sources