Results 21 to 30 of about 776 (176)
Galaxy mergers and gravitational lens statistics [PDF]
The Astrophysical Journal, 1994 We investigate the impact of hierarchical galaxy merging on the statistics of gravitational lensing of distant sources. Since no definite theoretical predictions for the merging history of luminous galaxies exist, we adopt a parametrized prescription, which allows us to adjust the expected number of pieces comprising a typical present galaxy at z=0.65.
Rix, Hans-Walter +3 more
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Statistics of voids of galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 1985 On a mis au point un algorithme pour etudier les vides dans la distribution des galaxies. On presente une analyse statistique des vides dans le catalogue des deplacements vers le rouge des galaxies du Centre d'Astrophysique. Le nombre des vides observes est compare a une distribution aleatoire et a la distribution a grumeaux de Soneira et ...
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STATISTICAL TOOLS FOR CLASSIFYING GALAXY GROUP DYNAMICS [PDF]
The Astrophysical Journal, 2009 The dynamical state of galaxy groups at intermediate redshifts can provide information about the growth of structure in the universe. We examine three goodness-of-fit tests, the Anderson--Darling (A-D), Kolmogorov and chi-squared tests, in order to determine which statistical tool is best able to distinguish between groups that are relaxed and those ...
Hou, A. +3 more
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A model for multiproperty galaxy cluster statistics [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 The massive dark matter halos that host groups and clusters of galaxies have observable properties that appear to be log-normally distributed about power-law mean scaling relations in halo mass. Coupling this assumption with either quadratic or cubic approximations to the mass function in log space, we derive closed-form expressions for the space ...
Evrard, August E. +3 more
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A model for galaxy–galaxy strong lensing statistics in surveys
Monthly Notices of the Royal Astronomical SocietyABSTRACT Photometric wide-area observations in the next decade will be capable of detecting a large number of galaxy-scale strong gravitational lenses, increasing the gravitational lens sample size by orders of magnitude. To aid in forecasting and analysis of these surveys, we construct a flexible model based on observed distributions ...
G Ferrami, J Stuart B Wyithe
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Intermittent Radio Galaxies and Source Statistics
The Astrophysical Journal, 1997 We suggest that extragalactic radio sources are intermittent on timescales of 10^4-10^5 yr. Using a simple spherical model of a cocoon/shock system, it is found that inactive sources fade rapidly in radio luminosity but the shock in the ambient medium continues to expand supersonically, thereby keeping the whole source structure intact during the ...
Reynolds, C. S., Begelman, M. C.
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A Lightweight Procedural Layer for Hybrid Experimental–Computational Workflows in Materials Science
Advanced Engineering Materials, EarlyView.We unveil a prototype hybrid‐workflow framework that fuses automatedcomputation with hands‐on experiments. Built atop pyiron, a lightweight, parameterized layer translates procedure descriptions into executable manual steps, syncing instrument settings, human interventions, and data capture in real‐time today.
Steffen Brinckmann +8 more
wiley +1 more source
Advanced Healthcare Materials, EarlyView.Living donor heart valves offer superior durability for pediatric patients but trigger immune rejection. Lentiviral delivery of viral immune‐evasion genes US2 and Serpin b9 into donor valve cells and valve tissue suppresses HLA expression, reduces PBMC clustering and cytotoxic killing, and induces transcriptional immune‐tolerance programs, paving the ...
Abraham van Wijk +11 more
wiley +1 more source
Statistical properties of the spatial distribution of galaxies [PDF]
Astrophysical Bulletin, 2009 The methods of determining the fractal dimension and irregularity scale in simulated galaxy catalogs and the application of these methods to the data of the 2dF and 6dF catalogs are analyzed. Correlation methods are shown to be correctly applicable to fractal structures only at the scale lengths from several average distances between the galaxies, and ...
openaire +2 more sources
Advanced Science, EarlyView.Complex microarchitectures emerge from simple flow‐driven transformations as static mixers iteratively reorient and split material domains. Coupled with diverse deposition strategies, chaotic printing provides an accessible platform for fabricating architected materials that support biologically and chemically relevant processes. ABSTRACT Nature builds
Edna Johana Bolívar‐Monsalve +7 more
wiley +1 more source