Results 41 to 50 of about 2,299,265 (280)

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 Dispersion, Size, Sérsic Index, and Dn4000: The Scaling of Stellar Mass with Dynamical Mass for Quiescent Galaxies [PDF]

, 2017
We examine the relation between stellar mass, velocity dispersion, size, Sérsic index, and for a volume-limited sample of ∼40,000 quiescent galaxies in the SDSS.
H. Zahid, M. Geller
semanticscholar   +1 more source

MOND PREDICTION FOR THE VELOCITY DISPERSION OF THE “FEEBLE GIANT” CRATER II [PDF]

, 2016
Crater II is an unusual object among the dwarf satellite galaxies of the Local Group in that it has a very large size for its small luminosity. This provides a strong test of MOND, as Crater II should be in the deep MOND regime (gin ≈ 34 km2 s−2 kpc−1 ...
S. McGaugh
semanticscholar   +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  

Determining the velocity dispersion of the thick disc [PDF]

Monthly Notices of the Royal Astronomical Society, 2012
We attempt to recover the mean vertical velocity and vertical velocity dispersion as a function of the Galactic height for a sample drawn from a realistic Galaxy distribution function by following the method presented in Moni Bidin et al. (2012). We find that, for the sample size used, the observational error in the velocities is much smaller than the ...
openaire   +4 more sources

THE SCALING OF STELLAR MASS AND CENTRAL STELLAR VELOCITY DISPERSION FOR QUIESCENT GALAXIES AT z < 0.7 [PDF]

, 2016
We examine the relation between stellar mass and central stellar velocity dispersion—the M*σ relation—for massive quiescent galaxies at z < 0.7. We measure the local relation from the Sloan Digital Sky Survey and the intermediate redshift relation from ...
J. Zahid, M. Geller, D. Fabricant, H. Hwang   +3 more
semanticscholar   +1 more source

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

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

The Velocity Dispersion Function of Very Massive Galaxy Clusters: Abell 2029 and Coma [PDF]

, 2016
Based on an extensive redshift survey for galaxy clusters Abell 2029 and Coma, we measure the luminosity functions (LFs) and stellar mass functions (SMFs) for the entire cluster member galaxies.
J. Sohn, M. Geller, H. Zahid, D. Fabricant, A. Diaferio, K. Rines   +5 more
semanticscholar   +1 more source