Results 21 to 30 of about 407,723 (180)

Estimation of the Soil Layers Thickness Using Multi-Chanel Analysis of Surface Waves and Surface Wave Dispersion Curve [PDF]

Journal of Structural and Construction Engineering, 2021
One of the most interesting topics in the geotechnical and geophysical engineering is the use of surface waves to characterize the earth subsurface layers.
Mehdi Hashemi Jokar, Hossein Rahnema, Abdolhossein Baghlani   +2 more
doaj   +1 more source

The Blackhole-Dark Matter Halo Connection [PDF]

, 2015
We explore the connection between the central supermassive blackholes (SMBH) in galaxies and the dark matter halo through the relation between the masses of the SMBHs and the maximum circular velocities of the host galaxies, as well as the relationship ...
Akl, Maya Abi, Chahine, Gilbert, Sabra, Bassem M., Saliba, Charbel   +3 more
core   +3 more sources

Phase-space shapes of clusters and rich groups of galaxies [PDF]

, 2013
Clusters and groups of galaxies are highly aspherical, with shapes approximated by nearly prolate ellipsoids of revolution. An equally fundamental property is the shape of these objects in velocity space which is the anisotropy of the global velocity ...
Wojtak, Radoslaw
core   +1 more source

Velocity dispersion in layered media [PDF]

SEG Technical Program Expanded Abstracts 2005, 2005
Summary Velocity dispersion in stratified media depends upon the impedance contrast between contiguous layers and the ratio (R) of the wavelength to the layer thickness. The goal of the present work is to understand the scale dependence of propagation velocities in periodically layered media. We based our analysis in 1-D wave equation forward modeling.
Carlos Cobos, De‐hua Han
openaire   +1 more source

Re-visiting the relations: Galactic thin disc age-velocity dispersion relation [PDF]

, 2007
The velocity dispersion of stars in the solar neighbourhood thin disc increases with time after star formation. Nordstrom et al. (2004) is the most recent observational attempt to constrain the age-velocity dispersion relation.
Alonso, Baranne, Barbanis, Bensby, Brown, Carlberg, Carlberg, Carr, Chiba, Crawford, De Simone, Dehnen, Dehnen, Dehnen, Dehnen, Edvardsson, ESA, Famaey, Famaey, Freeman, Fuchs, Fux, G. Gilmore, G. M. Seabroke, Gilmore, Girardi, Gomez, Haywood, Holmberg, Huang, Hänninen, Høg, Jenkins, Jenkins, Jørgensen, Kalnajs, Kroupa, Lacey, Lacey, Luri, Mayor, Ng, Nordström, Olsen, Olsen, Olsen, Olsen, Olsen, Olsen, Perryman, Quillen, Quillen, Quillen, Quinn, Reid, Salasnich, Schuster, Seabroke, Sellwood, Sellwood, Skuljan, Sommer-Larsen, Soubiran, Spitzer, Spitzer, Steinmetz, Stromgren, Toth, Valenti, Velazquez, Villumsen, Walker, Wielen, Woolley   +73 more
core   +2 more sources

The Mean and Scatter of the Velocity Dispersion-Optical Richness Relation for maxBCG Galaxy Clusters [PDF]

, 2007
The distribution of galaxies in position and velocity around the centers of galaxy clusters encodes important information about cluster mass and structure. Using the maxBCG galaxy cluster catalog identified from imaging data obtained in the Sloan Digital
Annis, J., Becker, M. R., Evrard, A., Johnston, D., Koester, B., Lau, E., McKay, T. A., Miller, C., Nichol, R., Rozo, E., Sheldon, E., Wechsler, R. H.   +11 more
core   +4 more sources

Electron velocity distribution function in a plasma with temperature gradient and in the presence of suprathermal electrons: application to incoherent-scatter plasma lines [PDF]

Annales Geophysicae, 1998
The plasma dispersion function and the reduced velocity distribution function are calculated numerically for any arbitrary velocity distribution function with cylindrical symmetry along the magnetic field.
P. Guio, J. Lilensten, W. Kofman, N. Bjørnå   +3 more
doaj   +1 more source

Realizing normal group-velocity dispersion in free space via angular dispersion [PDF]

Optics Letters, 2021
It has long been thought that normal group-velocity dispersion (GVD) cannot be produced in free space via angular dispersion. Indeed, conventional diffractive or dispersive components such as gratings or prisms produce only anomalous GVD. We identify the conditions that must be fulfilled by the angular dispersion introduced into a plane-wave pulse to ...
Layton A. Hall, Ayman F. Abouraddy
openaire   +3 more sources

Colors, magnitudes and velocity dispersions in early-type galaxies: Implications for galaxy ages and metallicities [PDF]

, 2004
We present an analysis of the color-magnitude-velocity dispersion relation for a sample of 39320 early-type galaxies within the Sloan Digital Sky Survey. We demonstrate that the color-magnitude relation is entirely a consequence of the fact that both the
Bower R. G., Bower R. G., D. P. Schneider, de Vaucouleurs G., J. Brinkmann, Jorgensen I., Kodama T., Mariangela Bernardi, Ravi K. Sheth, Robert C. Nichol   +9 more
core   +2 more sources

Theoretical Re-evaluations of Scaling Relations between SMBHs and Their Host Galaxies–2. Importance of AGN Feedback Suggested by Stellar Age–Velocity Dispersion Relation

Frontiers in Astronomy and Space Sciences, 2017
We present the galactic stellar age—velocity dispersion relation obtained from a semi-analytic model of galaxy formation. We divide galaxies into two populations: galaxies which have over-massive/under-massive black holes (BHs) against the best-fitting ...
Hikari Shirakata, Toshihiro Kawaguchi, Takashi Okamoto, Tomoaki Ishiyama   +3 more
doaj   +1 more source