scholarly journals Splash bridge models of inclined, gas-rich, direct galaxy collisions

2020 ◽  
Vol 492 (4) ◽  
pp. 4892-4916 ◽  
Author(s):  
Travis R Yeager ◽  
Curtis Struck
Keyword(s):  
Inelastic Collision ◽  
Good Evidence ◽  
Particle Simulation ◽  
Similar Form ◽  
Galactic Disc ◽  
Simulation Code ◽  
Direct Collision ◽  
Galaxy Collisions ◽  
Bridge Models ◽  
Over Time

ABSTRACT Splash bridges are formed from the direct inelastic collision of gas-rich galaxies. Recent multiwavelength observations of the Taffy galaxies, UGC 12914/15, have revealed complicated gas structures in the bridge. We have upgraded the sticky particle simulation code of Yeager & Struck by adding: the ability to adjust the relative inclination of the gas discs, the ability to track cloud–cloud collisions over time, and additional cooling processes. Inclination effects lead to various morphological features, including filamentary streams of gas stripped from the smaller galactic disc. The offset of disc centres at impact determines whether or not these streams flow in a single direction or multiple directions, even transverse to the motion of the two galaxies. We also find that, across many types of direct collision, independent of the inclination or offset, the distributions of weighted Mach numbers and shock velocities in colliding clouds relax to a very similar form. There is good evidence of prolonged turbulence in the gas of each splash bridge for all inclinations and offsets tested, as a result of continuing cloud collisions, which in turn are the result of shearing and differentially accelerated trajectories. The number distribution of high velocity shocks in cloud collisions, produced in our low inclination models, are in agreement with those observed by Appleton et al. in the Taffy Galaxies with ALMA.

scholarly journals Sequence Braiding: Visual Overviews of Temporal Event Sequences and Attributes

2020 ◽  
Author(s):  
Sara Di Bartolomeo ◽  
Yixuan Zhang ◽  
Fangfang Sheng ◽  
Cody Dunne
Keyword(s):  
Completion Time ◽  
Source Code ◽  
Good Evidence ◽  
Task Completion ◽  
Event Sequences ◽  
Sentinel Events ◽  
Temporal Events ◽  
High Level ◽  
Over Time ◽  
Temporal Event Sequences

Temporal event sequence alignment has been used in many domains to visualize nuanced changes and interactions over time. Existing approaches align one or two sentinel events. Overview tasks require examining all alignments of interest using interaction and time or juxtaposition of many visualizations. Furthermore, any event attribute overviews are not closely tied to sequence visualizations. We present SEQUENCE BRAIDING, a novel overview visualization for temporal event sequences and attributes using a layered directed acyclic network.SEQUENCE BRAIDING visually aligns many temporal events and attribute groups simultaneously and supports arbitrary ordering, absence, and duplication of events. In a controlled experiment we compare SEQUENCE BRAIDING and IDMVis on user task completion time, correctness, error, and confidence. Our results provide good evidence that users of SEQUENCE BRAIDING can understand high-level patterns and trends faster and with similar error. A full version of this paper with all appendices;the evaluation stimuli, data, and analysis code; and source code are available at osf.io/s92bu.

Development of Electromagnetic Particle Simulation Code in an Open System

2008 ◽  
pp. 329-343 ◽  
Author(s):  
Hiroaki Ohtani ◽  
Seiji Ishiguro ◽  
Ritoku Horiuchi ◽  
Yasuharu Hayashi ◽  
Nobutoshi Horiuchi
Keyword(s):  
Open System ◽  
Particle Simulation ◽  
Simulation Code

Three-dimensional parallelized fully-electromagnetic particle simulation code UNIPIC-3D

2010 ◽  
Vol 22 (9) ◽  
pp. 2103-2110
Author(s):  
陈再高 Chen Zaigao ◽  
王建国 Wang Jianguo ◽  
张殿辉 Zhang Dianhui ◽  
王玥 Wang Yue ◽  
刘纯亮 Liu Chunliang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Particle Simulation ◽  
Simulation Code

scholarly journals Particle simulation code for longitudinal dynamics of heavy ion beams

1981 ◽  
Author(s):  
A. Sternlieb ◽  
L. Smith ◽  
L.J. Laslett ◽  
J. Bisognano ◽  
I. Haber
Keyword(s):  
Heavy Ion ◽  
Ion Beams ◽  
Particle Simulation ◽  
Simulation Code ◽  
Longitudinal Dynamics

scholarly journals ELBA (electron beams in accelerators) particle simulation code

1994 ◽  
Vol 12 (2) ◽  
pp. 273-282 ◽  
Author(s):  
Glenn Joyce ◽  
Jonathan Krall ◽  
Steven Slinker
Keyword(s):  
Large Scale ◽  
Electron Beams ◽  
Three Dimensional ◽  
Forward Direction ◽  
Laboratory Frame ◽  
Particle Simulation ◽  
Simulation Code ◽  
Particle In Cell ◽  
Charged Particle Beams ◽  
Cell Simulation

ELBA is a three-dimensional, particle-in-cell, simulation code that has been developed to study the propagation and transport of relativistic charged particle beams. The code is particularly suited to the simulation of relativistic electron beams propagating through collisionless or slightly collisional plasmas or through external electric or magnetic fields. Particle motion is followed via a coordinate “window” in the laboratory frame that moves at the speed of light. This scheme allows us to model only the immediate vicinity of the beam. Because no information can move in the forward direction in these coordinates, particle and field data can be handled in a simple way that allows for very large scale simulations. A mapping scheme has been implemented that, with corrections to Maxwell's equations, allows the inclusion of bends in the simulation system.

The simulation of a plasma confined in an electrostatically plugged spindle cusp

1980 ◽  
Vol 58 (8) ◽  
pp. 1216-1229 ◽  
Author(s):  
M. Shoucri ◽  
J. P. Matte ◽  
B. C. Gregory
Keyword(s):  
Theoretical Model ◽  
Axial Symmetry ◽  
Electrode Potential ◽  
Excess Electron ◽  
Particle Simulation ◽  
Experimental Device ◽  
Dynamic Evolution ◽  
Potential Well ◽  
Electron Charge ◽  
Simulation Code

A particle simulation code is used to study the dynamic evolution and the confinement of a non-neutral plasma in an electrostatically plugged magnetic spindle cusp configuration. The code assumes axial symmetry and functions in the electrostatic limit. The walls and electrodes of the actual experimental device are included. The electrons are found to be extremely well confined. The excess electron charge creates a potential well, which, after initial fluctuations, is found to be stable. At later times ions are found to leak out slowly through the point cusps, in contrast with the beginning where most ion losses are through the line cusp. This is due to electron shielding of the electrode potential, as predicted by an earlier theoretical model.

scholarly journals Particle simulation for an axisymmetric pulsar magnetosphere

2012 ◽  
Vol 8 (S291) ◽  
pp. 537-539
Author(s):  
Tomohide Wada
Keyword(s):  
Gamma Ray ◽  
Particle Interaction ◽  
Mean Free Path ◽  
Pair Creation ◽  
Particle Simulation ◽  
Pulsar Magnetosphere ◽  
Simulation Code ◽  
Quadrupole Magnetic Field ◽  
Future Work ◽  
Magnetic Pair

AbstractWe developed a new particle simulation code which includes pair creation (magnetic pair creation and photon collision process), propagation of gamma-ray, inertia of particle, interaction of plasma and multi-pole stellar field for steady axisymmetric pulsar magnetosphere. The photon path is solved stochastically by an analytical solution of the mean free path of pair creation processes at the photon position. The superimposed quadrupole magnetic field forms asymmetric electrostatic clouds on tje poloidal plane and the accelerating region is different from the dipole case. Here, we demonstrate some results of a test run for our simulation. We will adopt the code for more complicated cases, such that all above-mentioned effects will be considered together in future work.

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