Results 31 to 40 of about 561,353 (372)

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

Biases in the estimation of velocity dispersions and dynamical masses for galaxy clusters [PDF]

EPJ Web of Conferences, 2020
Using a set of 73 numerically simulated galaxy clusters, we have characterised the statistical and physical biases for three velocity dispersion and mass estimators, namely biweight, gapper and standard deviation, in the small number of galaxies regime ...
Ferragamo A., Rubiño-Martín J.A., Betancort-Rijo J., Munari E., Sartoris B., Barrena R.   +5 more
doaj   +1 more source

Velocity Dispersions of Massive Quiescent Galaxies from Weak Lensing and Spectroscopy

, 2020
We use MMT spectroscopy and deep Subaru Hyper Suprime-Cam (HSC) imaging to compare the spectroscopic central stellar velocity dispersion of quiescent galaxies with the effective dispersion of the dark matter halo derived from the stacked lensing signal ...
Dell'Antonio, Ian P., Geller, Margaret J., Kawanomoto, Satoshi, Komiyama, Yutaka, Koshida, Shintaro, Miyazaki, Satoshi, Sohn, Jubee, Utsumi, Yousuke, Zahid, Harus J.   +8 more
core   +1 more source

On the wobbles of phase-velocity dispersion curves

Geophysical Journal International, 2020
SUMMARYTo calculate phase-velocity dispersion curves, we introduce a method which reflects both structural and dynamic effects of wave propagation and interference. Rayleigh-wave fundamental-mode surface waves from the South Atlantic Ocean earthquake of 19 August 2016, M = 7.4, observed at the AlpArray network in Europe are strongly influenced by the ...
Kolinsky P., Bokelmann G., Hetenyi G., Abreu R., Allegretti I., Apoloner M. -T., Aubert C., Besancon S., De Berc M. B., Bokelmann G., Brunel D., Capello M., Carman M., Cavaliere A., Cheze J., Chiarabba C., Clinton J., Cougoulat G., Crawford W. C., Cristiano L., Czifra T., D'Alema E., Danesi S., Daniel R., Dannowski A., Dasovic I., Deschamps A., Dessa J. -X., Doubre C., Egdorf S., Fiket T., Fischer K., Friederich W., Fuchs F., Funke S., Giardini D., Govoni A., Graczer Z., Groschl G., Heimers S., Heit B., Herak D., Herak M., Huber J., Jaric D., Jedlicka P., Jia Y., Jund H., Kissling E., Klingen S., Klotz B., Kolinsky P., Kopp H., Korn M., Kotek J., Kuhne L., Kuk K., Lange D., Loos J., Lovati S., Malengros D., Margheriti L., Maron C., Martin X., Massa M., Mazzarini F., Meier T., Metral L., Molinari I., Moretti M., Nardi A., Pahor J., Paul A., Pequegnat C., Petersen D., Pesaresi D., Piccinini D., Piromallo C., Plenefisch T., Plomerova J., Pondrelli S., Prevolnik S., Racine R., Regnier M., Reiss M., Ritter J., Rumpker G., Salimbeni S., Santulin M., Scherer W., Schippkus S., Schulte-Kortnack D., Sipka V., Solarino S., Spallarossa D., Spieker K., Stipcevic J., Strollo A., Sule B., Szanyi G., Szucs E., Thomas C., Thorwart M., Tilmann F., Ueding S., Vallocchia M., Vecsey L., Voigt R., Wassermann J., Weber Z., Weidle C., Wesztergom V., Weyland G., Wiemer S., Wolf F., Wolyniec D., Zieke T., Zivcic M., Zlebcikova H.   +118 more
openaire   +3 more sources

On the pairwise velocity dispersion of galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 1993
Previous statistical results have shown that the pairwise velocity dispersion σ g (r p ) of galaxies at small separations (r p ≃ 1 h −1 Mpc) is about 300 km s −1 . This value is significantly lower than the predictions of currently favoured models of structure formation, unless a large pairwise velocity bias exists between galaxies and the ...
Gerhard Börner, Houjun Mo, Houjun Mo, Yipeng Jing, Yipeng Jing   +4 more
openaire   +2 more sources

Pictures of Blockscale Transport: Effective versus Ensemble Dispersion and Its Uncertainty [PDF]

Adv. Water Resour. 91 (2016), 11-22, 2016
Using a Lagrangian framework, we discuss different conceptualizations of the blockscale dispersion tensor. We distinguish effective and ensemble blockscale dispersion, which measure the impact of subscale velocity fluctuations on solute dispersion. Ensemble dispersion quantifies subscale velocity fluctuations between realizations, which overestimates ...
arxiv   +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.
De-hua Han, Carlos Cobos
openaire   +1 more source

Influence of Physical Parameters of Coal Seam on “Cross” Phenomenon of Rayleigh In-seam Wave Dispersion Curve

Meikuang Anquan, 2020
Dispersion curves of Rayleigh channel waves may have “cross” between the fundamental and first higher order modes either in the phase velocities or in group velocities in the low frequency band.
HE Daxi, ZHU Peimin, SHEN Suishui, CAI Wei, WANG Wengang
doaj   +1 more source

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

Dynamic fluid transport property of hydraulic fractures and its evaluation using acoustic logging

Petroleum Exploration and Development, 2022
The existing acoustic logging methods for evaluating the hydraulic fracturing effectiveness usually use the fracture density to evaluate the fracture volume, and the results often cannot accurately reflect the actual productivity.
Huanran LI, Xiaoming TANG, Shengqing LI, Yuanda SU   +3 more
doaj